Thin-Film Composite Reverse-Osmosis Membrane
Full Analysis

Invention Disclosure Review

Thin-Film Composite Reverse-Osmosis Membrane

Generated
Jul 20, 2026

Generated on a public invention disclosure — no confidential material involved. First-pass analysis — not an opinion of counsel or drafted claims.

1.

Cross-Domain Application Map

High-pressure seawater desalination (origin field) — Thin-film composite reverse-osmosis membrane elements for seawater desalination plants operating at ~40–70 atm.

The self-limiting ultrathin crosslinked barrier sieves dissolved salt ions while its extreme thinness minimizes water-transport resistance, delivering the disclosed simultaneous high rejection and high flux — the generalized size-selective interfacial barrier applied to its home problem. This is where the attorney files first and where the closest, densest prior art (earlier interfacial-polymerization and single-monomer polyamide films) lives.

Evidence: data_backed · Application distance: near

Organic solvent nanofiltration / solvent-resistant molecular separation — Membranes for recovering homogeneous catalysts, concentrating or purifying active pharmaceutical ingredients, and performing solvent exchange or molecular-weight fractionation in non-aqueous media.

The distinguishing move — crosslinking via an at-least-tri-functional reactant — produces a network that resists swelling and dissolution in organic solvents, which is precisely what makes a size-selective barrier stable outside water. A water-membrane practitioner would not target organic feeds, yet the invention's crosslinked network directly answers the hard need for solvent-stable molecular sieving, making this a strong non-obvious wedge with large chemical/pharma pull.

Evidence: speculative · Application distance: far

Water nanofiltration (softening / selective ion separation) — Loose-network membranes for hardness and sulfate removal, dye/salt fractionation, and micropollutant rejection at low operating pressure.

The same interfacial platform, with the crosslinked network tuned more open, passes monovalent salts and water at high flux while sieving larger divalent ions and organics — a straightforward re-tuning of the size-selective barrier. Very high commercial pull, though obvious to an origin-field practitioner.

Evidence: speculative · Application distance: adjacent

Gas separation / carbon capture — Thin-film composite membranes for CO2/CH4 (natural-gas sweetening), CO2/N2 (flue-gas capture), H2 recovery, and air separation.

An ultrathin, defect-free, crosslinked selective skin on a porous support is the exact architecture that maximizes gas permeance while retaining selectivity; the self-limiting interfacial reaction yields pinhole-free ultrathin layers that are difficult to achieve by casting. The transport regime differs from liquid RO, so this is a genuinely far, non-obvious extension with major energy-sector pull.

Evidence: speculative · Application distance: far

Brackish and industrial high-pressure water purification (origin field) — Reverse-osmosis modules for brackish groundwater, boiler feed, semiconductor-grade ultrapure water, and wastewater reuse.

Decoupling the barrier chemistry from the support lets the same crosslinked film be run on lower-salinity feeds at high recovery; the demonstrated seawater-grade separation inherently covers these easier feeds. Named as the invention's field but not separately demonstrated in the disclosure.

Evidence: described_not_demonstrated · Application distance: near

Osmotically driven processes (forward osmosis / pressure-retarded osmosis) — Membranes for concentration and dewatering (FO) and for salinity-gradient power generation (PRO).

An ultrathin dense selective layer minimizes internal concentration-polarization resistance while rejecting solute, enabling efficient osmotically driven water flux — the same thinness-plus-selectivity that decouples the RO trade-off, applied to osmotic driving forces.

Evidence: speculative · Application distance: adjacent

2.

Claim Architecture

The claim-level view (the primary analysis): the broadest defensible claim is on the mechanism itself — it covers every use — while a standalone same-mechanism application claim is weak. This is engineering work-product / a scaffold for counsel, NOT drafted claims or a patentability conclusion. Grounded in the prior art available to this report; confirm against a full search before relying on it.

Broadest mechanism (the dominating claim): A crosslinked aromatic polyamide barrier layer formed in situ by self-limiting interfacial polycondensation at a liquid–liquid interface — an essentially monomeric aromatic polyamine dissolved in an aqueous phase reacting with an essentially monomeric aromatic polyacyl halide that is at least tri-functional dissolved in an immiscible organic phase — deposited as an ultrathin, size-selective film on a microporous support. The mechanism's core is the pairing of a monomeric aromatic polyamine with an at-least-tri-functional aromatic acyl halide, so that the third acyl functionality drives crosslinking into a network (rather than a linear polyamide) and the reaction is self-terminating as the nascent film blocks further monomer transport. This is stated at the broadest level the disclosure supports (any such monomeric aromatic amine / at-least-tri-functional aromatic acyl halide pair), with MPD (~2 wt%) and trimesoyl chloride (~0.1% w/v) as the demonstrated species.

Composition claim set

Covers: crosslinked aromatic polyamide barrier layer, essentially monomeric aromatic polyamine (aqueous), essentially monomeric aromatic polyacyl halide that is at least tri-functional (organic), at least tri-functional acyl halide requirement for crosslinking, m-phenylenediamine, trimesoyl chloride

Closest prior art: The retrieved MPD/TMC papers (e.g., 'Interfacial Polymerization of Aromatic Polyamide Reverse Osmosis Membranes (2024)' and the disulfonated-diamine paper) and CN111282447B, which describe crosslinked aromatic polyamide from an aromatic polyamine reacted with trimesoyl chloride; D2 (single-monomer polyamide films) is the closest cited-class reference. (verify)

Distinguishing limitation: Relative to D2 (single-monomer / linear polyamide films), the distinguishing structural element is the at-least-tri-functional aromatic acyl halide producing a crosslinked (network) aromatic polyamide rather than a linear chain. Note for counsel: the fully monomeric MPD/TMC two-component crosslinked barrier itself appears in retrieved references that add a third monomer (disulfonated diamine), surfactant, or a 2D-nanomaterial intermediate layer; the composition distinction that survives the closest of those is the barrier being the reaction product of ONLY an essentially monomeric aromatic polyamine and an essentially monomeric at-least-tri-functional aromatic acyl halide, with no additional co-monomer, dispersed polymeric additive, or intermediate deposition layer. Do NOT rest the distinction on the flux/rejection numbers alone.

Standard: §102/§103 (for counsel to assess)

Process claim set

Covers: interfacial polycondensation on a microporous support, self-limiting ultrathin film formed in under 1 second, ~10 second contact time, essentially monomeric aromatic polyamine (aqueous), essentially monomeric at-least-tri-functional aromatic polyacyl halide (organic), ~2 wt% m-phenylenediamine, ~0.1% w/v trimesoyl chloride

Closest prior art: CN111282447B (preparation method: aromatic amine + surfactant aqueous phase on ultrafiltration support, then polyfunctional acyl chloride oil phase 10–120 s, followed by heat treatment). (verify)

Distinguishing limitation: CN111282447B requires a surfactant in the aqueous phase and a mandatory post-formation heat-treatment step, and CN112023732B requires a pre-deposited 2D-nanomaterial intermediate layer. The surviving process distinction is formation of the self-limiting crosslinked film directly from the immiscible two-phase contact of essentially monomeric reactants (film self-terminating in under ~1 second, ~10 s total contact) without any surfactant, without an intermediate deposition layer, and without a required heat-cure step. Rest the distinction on the absence of those additional process elements, not on the resulting flux value.

Standard: §103 obviousness (for counsel to assess)

Structure claim set

Covers: thin-film composite (TFC) architecture, interfacial polycondensation on a microporous support, crosslinked aromatic polyamide barrier layer

Closest prior art: US9156006B2 (thin-film composite membrane: polysulfone/polyethersulfone porous support with defined pore-size distribution, a polymeric additive dispersed in the support, and a semi-permeable selective barrier on one face). (verify)

Distinguishing limitation: US9156006B2 characterizes the TFC by specified support pore geometry and a polymeric additive (1–50 wt%) dispersed within the porous support, and is directed to forward-osmosis/pressure-retarded osmosis. The distinguishing structural limitation here is the selective barrier being a self-limiting ultrathin crosslinked aromatic polyamide formed in situ directly on the microporous support (no polymeric additive dispersed in the support and no separate intermediate layer as the source of selectivity). Distinction rests on the identity/formation of the barrier layer, not on total shielding-type aggregate performance.

Standard: §102/§103 (for counsel to assess)

Method-of-use claim set

Covers: simultaneous high salt rejection and high water flux, operating pressure range 40–70 atm, extension to seawater and general high-pressure water purification

Closest prior art: D3 (prior RO membranes achieving >98% rejection but flux well below ~600 L/m²/day); retrieved RO/desalination TFC papers describing high-pressure seawater operation.

Distinguishing limitation: Applying the membrane to high-pressure seawater desalination is a predictable use of a separation membrane (KSR predictable-use concern) and is a weak standalone basis. Any use-claim value would depend on a non-obvious operational adaptation tied to the crosslinked-barrier structure rather than on the rejection/flux figures themselves, since improved throughput follows directly from the ultrathin self-limiting barrier already claimed structurally/compositionally. Flagged as the weakest set — for counsel to weigh against the composition/process sets.

Standard: §103 obviousness / KSR predictable-use (for counsel to assess)

3.

Novelty & Nonobviousness Stress Test

Inventive-Step Stress Test

The adversarial pass: the strongest case AGAINST the moat, so counsel sees the threats before an examiner or opponent does. Challenges rest only on the prior art available to this report; inventor-asserted premises are checked against that art rather than repeated as fact. Engineering work-product — it names §102/§103, it does not conclude.

The moat is under heavy pressure from the provided art. The invention as generalized is the classic two-component MPD/TMC interfacial-polymerization TFC polyamide membrane, and the retrieved plain-MPD/TMC papers (notably 'Interfacial Polymerization of Aromatic Polyamide RO Membranes (2024)' and the parametric-study papers) plus CN111282447B/CN118663069A bear directly on the composition (crosslinked network from a monomeric aromatic diamine + tri-functional TMC), the process (rapid self-limiting two-phase IP), and the structure (barrier formed in situ on a polysulfone microporous support) — each a substantial §102/§103 concern for counsel to weigh. The asserted 'breaking the trade-off' story is the softest link: the headline flux is inflated by 68 atm operating pressure (a conventional condition), and the provided 2019 upper-bound / 2026 thermodynamic papers give an examiner a ready framework to argue the numbers sit on, not beyond, the known permeance–selectivity bound once normalized. The strongest SURVIVING position is the NEGATIVE-limitation framing the architecture already identifies: a barrier that is the reaction product of ONLY a monomeric aromatic polyamine and a monomeric at-least-tri-functional aromatic acyl halide, self-terminating from bare two-phase contact, with NO surfactant, NO dispersed polymeric additive, NO intermediate deposition layer, and NO required heat-cure — precisely the added elements that distinguish CN111282447B (surfactant + cure), CN112023732B (2D interlayer), US9156006B2 (dispersed additive), CN119345915A (AgNP/plasma), and CN118663069A (imidazole surfactant). To hold, that position must be anchored on the absence of those elements and on a pressure-normalized permeability/selectivity metric versus the upper bound — never on the raw flux figure, which the provided art shows is trivially inflated by operating pressure. Counsel should also verify whether any plain-MPD/TMC paper in the record explicitly performs additive-free, cure-free IP, since that would erode even the surviving negative-limitation distinction.

Strongest challenges to the distinguishing limitations

  • Composition: barrier is the reaction product of ONLY an essentially monomeric aromatic polyamine and an essentially monomeric at-least-tri-functional aromatic acyl halide (MPD + TMC), forming a crosslinked network with no additional co-monomer, dispersed additive, or intermediate deposition layer — substantial — counsel must weigh

    • Multiple retrieved references disclose exactly the two-component MPD/TMC crosslinked aromatic polyamide barrier. 'Interfacial Polymerization of Aromatic Polyamide Reverse Osmosis Membranes (2024)' expressly describes cross-linking of TMC and MPD at the aqueous–organic interface; the parametric-study papers (RSC Advances 2015; 'Factors affecting the interfacial polymerization'; 'Effects of interfacial polymerization conditions 2017') and the 2010 positron-annihilation TFC study all fabricate the plain MPD/TMC polyamide active layer without an added third monomer or dispersed polymeric additive. The disulfonated-diamine paper and the surfactant/nanoparticle patents ADD components, so they distinguish — but the plain two-component papers bear directly on §102/§103 for the composition as claimed. For counsel to weigh.
    • Rests on: Interfacial Polymerization of Aromatic Polyamide Reverse Osmosis Membranes (2024); RSC Advances 2015 parametric study; 2010 positron-annihilation TFC study (provenance: grounded)

  • Composition: the at-least-tri-functional acyl halide producing a crosslinked network (vs. D2 single-monomer / linear polyamide) — substantial — counsel must weigh

    • CN111282447B and CN118663069A both list trimesoyl chloride (tri-functional) as the polyacyl chloride reacted with m-phenylenediamine, and the 2024 IP paper attributes cross-linking to TMC's multi-functionality. The network-vs-linear distinction over D2 is directly addressed by these references disclosing the tri-functional TMC route — bears on §102/§103. For counsel to weigh.
    • Rests on: CN111282447B; CN118663069A; Interfacial Polymerization of Aromatic Polyamide RO Membranes (2024) (verify) (provenance: grounded)

  • Process: self-limiting crosslinked film formed directly from immiscible two-phase contact of monomeric reactants, WITHOUT surfactant, WITHOUT intermediate deposition layer, WITHOUT required heat-cure — substantial — counsel must weigh

    • The plain MPD/TMC IP papers (2010 pervaporation TFC study; RSC Advances 2015; 2017 optimization study) describe standard interfacial polymerization from an MPD aqueous phase and a TMC organic phase on a polysulfone support — the base process without a mandatory surfactant, intermediate 2D layer, or nanoparticle. CN111282447B (surfactant + heat treatment) and CN112023732B (2D-nanomaterial intermediate) ADD steps and therefore distinguish; the surviving distinction is the ABSENCE of those steps, but the underlying additive-free two-phase IP itself is disclosed in the plain-MPD/TMC literature. Bears on §102/§103. For counsel to weigh whether any of the plain-IP papers explicitly omit or include a curing step (verify full text).
    • Rests on: RSC Advances 2015 parametric study; 2017 optimization study; 2010 positron-annihilation TFC study (provenance: verify_full_doc)

  • Process: interfacial reaction self-limiting/substantially complete in under ~1 second with ~10 s contact — substantial — counsel must weigh

    • The 2024 IP paper describes the process as 'rapid cross-linking, followed by slow...' at the solution interface, and CN111282447B specifies a 10–120 s oil-phase contact — both bear on the rapid, self-terminating nature of the film and the ~10 s contact window. Bears on §102/§103. For counsel to weigh.
    • Rests on: Interfacial Polymerization of Aromatic Polyamide RO Membranes (2024); CN111282447B (verify) (provenance: grounded)

  • Structure: selective barrier is a self-limiting ultrathin crosslinked aromatic polyamide formed in situ directly on the microporous support, with no polymeric additive dispersed in the support and no separate selectivity-providing intermediate layer — substantial — counsel must weigh

    • US9156006B2 requires a polymeric additive (1–50 wt%) dispersed in the support and is directed to FO/PRO, so it distinguishes on those features. But the plain MPD/TMC TFC papers ('Advanced fabrication...TFC on polysulfone supports'; RSC Advances 2015) disclose the polyamide selective barrier formed directly on a polysulfone microporous support without a dispersed additive or intermediate layer — this is the conventional TFC architecture. Bears on §102/§103 for the structural claim. For counsel to weigh.
    • Rests on: Advanced fabrication and characterization of TFC polyamide membranes (polysulfone supports); RSC Advances 2015 parametric study (provenance: verify_full_doc)

  • Method of use: applying the membrane to high-pressure seawater desalination — substantial — counsel must weigh

    • The second-round SWRO literature (two-stage SWRO for high-salinity/high-temperature seawater; high-flux membranes on high-pH decarbonated seawater; FilmTec techno-economic review) describes operating TFC RO membranes at high pressure on seawater. Combined with the predictable-use concern (KSR), applying a separation membrane to its intended high-pressure desalination service bears on §103. The distinct high-throughput result flows from the already-claimed barrier structure, so this set is the weakest. For counsel to weigh.
    • Rests on: SWRO configuration/techno-economic review papers (second-round); D3 (provenance: verify_full_doc)

Inventor-asserted premises, checked against the art

  • Prior RO membranes faced a hard trade-off: >98% rejection was hard to reach and, when reached, flux fell well below usable levels (~600 L/m²/day) (industry_norm) — supported by the provided art

    • The 2019 'upper bound of TFC polyamide membranes' paper and the 2026 thermodynamic permeance–selectivity analysis both establish that a permeance–selectivity (flux vs. rejection) trade-off is a recognized constraint for TFC RO membranes, corroborating that such a trade-off exists. Note this cuts both ways: the same upper-bound art can be used to test whether the asserted 1754 L/m²/day figure actually lies beyond the established bound or merely reflects high applied pressure.

  • At least tri-functional acyl halide is required to achieve crosslinking in the polyamide barrier layer (other) — supported by the provided art

    • The 2024 IP paper attributes network cross-linking to TMC/MPD reaction, and CN111282447B/CN118663069A pair the tri-functional trimesoyl chloride with m-phenylenediamine for the dense layer. This is also textbook step-growth chemistry (a strictly difunctional acyl halide gives a linear chain; the third acyl group enables a network). Corroborated by the art, though note it is a well-understood polymer-chemistry consequence rather than a discovery.

  • The interfacial reaction is self-limiting and substantially complete in under 1 second, producing an ultrathin film (other) — supported by the provided art

    • The 2024 IP paper describes 'rapid cross-linking, followed by slow...' at the interface, consistent with a self-terminating film that blocks further monomer transport; CN111282447B's short (10–120 s) reaction window and the general TFC literature corroborate rapid, transport-limited film formation. The specific 'under 1 second' figure is not independently quantified in the provided art (verify), but the self-limiting mechanism is corroborated.

  • Salt rejection 99.3–99.5% simultaneously with flux ~43 gfd (~1754 L/m²/day), breaking the usual rejection-vs-flux compromise (performance_target) — uncorroborated (inventor-asserted; not shown by the provided art)

    • No provided reference confirms this specific rejection/flux pairing for a plain MPD/TMC membrane, but neither does any refute it — and the 2019 upper-bound and 2026 trade-off papers suggest the ~1754 L/m²/day figure should be examined for whether it reflects intrinsic permeability or simply the 68 atm applied pressure. CN118663069A reports >99% NaCl rejection at >5 LMH/bar permeability for a plain (surfactant-controlled) MPD/TMC-class membrane, which counsel should compare. The headline pairing is not corroborated as a break from the trade-off; it may sit on the known upper bound once normalized to pressure.

  • Flux rising above 1200 L/m²/day in synthetic-seawater tests (performance_target) — uncorroborated (inventor-asserted; not shown by the provided art)

    • No provided reference reports this specific figure. As with the seawater figure, it must be normalized to applied pressure before it can be credited as distinguishing; the provided upper-bound art frames the appropriate normalization (permeability A and A/B).

  • Forming the crosslinked barrier by in-situ interfacial polymerization on a porous support decouples the barrier chemistry from the support (comparative_advantage) — supported by the provided art

    • This is the defining premise of the thin-film composite architecture and is corroborated by virtually every retrieved TFC reference (US9156006B2, CN111282447B, CN112023732B, and all plain MPD/TMC papers), each forming a polyamide selective layer on a separately made porous support. Because it is the industry norm rather than a departure, it corroborates the premise but does not itself supply novelty.

Performance-metric scrutiny

  • ~43 gfd / ~1754 L/m²/day total water flux at 99.43% rejection — trivially satisfied by a conventional element — not where the novelty lives

    • Why: Total flux scales with the applied transmembrane pressure; the reported figure is taken at ~68 atm, a high conventional SWRO operating pressure that inflates absolute flux for any given membrane. Rejection near 99.4% is achievable by many conventional MPD/TMC TFC membranes.
    • Metric that actually distinguishes the invention: Intrinsic water permeability coefficient A (L/m²/h/bar, i.e. flux normalized to net driving pressure after osmotic back-pressure) and the A/B (permeability-to-salt-permeability, or permeance–selectivity) position relative to the established TFC upper bound of the 2019 paper.

  • Flux rising above 1200 L/m²/day in synthetic-seawater tests — trivially satisfied by a conventional element — not where the novelty lives

    • Why: Same pressure dependence — absolute flux is a function of applied pressure and feed osmotic pressure, not solely of the barrier chemistry.
    • Metric that actually distinguishes the invention: Pressure-normalized water permeability and permeance–selectivity trade-off position; also barrier-layer thickness / thickness-normalized permeance as the true structural discriminator of the 'ultrathin self-limiting' film.

  • 99.3–99.5% salt rejection — carries weight

    • Metric that actually distinguishes the invention: Rejection at the SAME normalized permeability as prior TFC membranes — i.e. whether the (permeability, rejection) point lies above the recognized upper bound rather than on it.
4.

Claim Outline

Claim Scaffold

A drafting scaffold for counsel — plain-language claim CONCEPTS and fallback positions to turn into claims, NOT drafted claims and NOT legal advice. The broadest claim is on the mechanism (it covers every use); each dependent rung is a narrower fallback if the independent claim is narrowed. Every item is tagged by the disclosure support behind it (§112).

Independent claim — Composition

Concept: A crosslinked aromatic polyamide barrier layer that is the reaction product of only two essentially monomeric reactants — an essentially monomeric aromatic polyamine and an essentially monomeric aromatic acyl halide bearing at least three acyl-halide groups — such that the third (or higher) acyl functionality ties the polyamide into a crosslinked network rather than a linear chain, the layer supported on a microporous substrate and containing no additional co-monomer, no dispersed polymeric additive, and no separate intermediate deposition layer as the source of selectivity. (§112 support: data-backed)

Core elements: crosslinked aromatic polyamide barrier layer, essentially monomeric aromatic polyamine, essentially monomeric at-least-tri-functional aromatic polyacyl halide, at-least-tri-functional acyl halide requirement driving crosslinking into a network

Dependent ladder (broad → narrow):

  • the aromatic polyamine is a diamine and the acyl halide is exactly tri-functional (a triacyl halide) — narrows the genus to the demonstrated network topology (diamine + triacid chloride) while still covering species other than the exact MPD/TMC pair (§112 support: described, no data)
  • the aromatic polyamine is m-phenylenediamine and the acyl halide is trimesoyl chloride — captures the specific worked-example chemistry — the commercially dominant TFC polyamide pair (§112 support: data-backed)
  • the barrier layer is ultrathin and self-limiting in thickness such that film growth self-terminates as the nascent film blocks further monomer transport across the interface — anchors the structural signature that distinguishes an in-situ interfacial network from a cast or thicker linear polyamide film (§112 support: data-backed)
  • the reactant loading corresponds to the demonstrated regime — on the order of ~2 wt% polyamine in the aqueous phase and ~0.1% w/v acyl halide in the organic phase — fallback tying the composition to the specific concentration ratio that produced the tested membrane, should broader concentration-independent claims be challenged (§112 support: data-backed)

Independent claim — Process

Concept: A method of forming the selective barrier by contacting a microporous support carrying an aqueous phase of an essentially monomeric aromatic polyamine with an immiscible organic phase of an essentially monomeric at-least-tri-functional aromatic acyl halide, so that interfacial polycondensation deposits a self-limiting crosslinked aromatic polyamide film directly at the liquid–liquid interface — the film self-terminating in under about one second within a total contact time on the order of ten seconds — carried out without any surfactant in the aqueous phase, without a pre-deposited intermediate layer, and without a required heat-cure step. (§112 support: data-backed)

Core elements: interfacial polycondensation on a microporous support, self-limiting ultrathin film formed in under 1 second, ~10 second total contact time, immiscible two-phase contact of essentially monomeric reactants, absence of surfactant, intermediate layer, and required heat-cure

Dependent ladder (broad → narrow):

  • the aqueous phase contains on the order of ~2 wt% m-phenylenediamine and the organic phase on the order of ~0.1% w/v trimesoyl chloride — ties the process to the demonstrated formulation; covers the commercial manufacturing recipe (§112 support: data-backed)
  • the film reaches its self-limiting thickness in under about one second of interfacial contact — captures the rapid self-terminating kinetics as a distinct process signature against processes requiring extended reaction or curing (§112 support: data-backed)
  • total two-phase contact is on the order of ten seconds before separation of the phases — fallback fixing the short overall process window that distinguishes over heat-cured / long-residence processes (§112 support: data-backed)
  • the process omits any post-formation thermal treatment and any pre-formation deposition of a 2D-nanomaterial or other intermediate layer — directly blocks the cited surfactant+heat-cure and pre-deposited-nanomaterial process routes (§112 support: described, no data)

Independent claim — Structure

Concept: A thin-film composite membrane in which the selective layer is a self-limiting ultrathin crosslinked aromatic polyamide formed in situ directly on a microporous support, the selectivity residing in that in-situ interfacial network barrier rather than in any polymeric additive dispersed within the support or in any separate intermediate layer. (§112 support: data-backed)

Core elements: thin-film composite (TFC) architecture, crosslinked aromatic polyamide barrier layer formed in situ on the microporous support, selectivity residing in the in-situ barrier, not in a support-dispersed additive or intermediate layer

Dependent ladder (broad → narrow):

  • the microporous support is free of any dispersed polymeric additive serving as a source of selectivity — distinguishes over TFC constructions that place a polymeric additive within the support (§112 support: described, no data)
  • the crosslinked aromatic polyamide barrier is the sole selective layer, with no separate intermediate layer between it and the support — blocks intermediate-layer / nanomaterial-interlayer TFC variants (§112 support: described, no data)
  • the barrier is the MPD/trimesoyl-chloride crosslinked polyamide network — narrows the structure to the demonstrated chemistry for a strong fallback position (§112 support: data-backed)

Independent claim — Method-of-use

Concept: A method of separating dissolved salts from an aqueous feed by driving the feed across the crosslinked aromatic polyamide TFC membrane under applied pressure, the ultrathin self-limiting network barrier permitting high solvent throughput while rejecting dissolved solute; presented as the weakest set and dependent on operational features tied to the crosslinked-barrier structure rather than on stated performance numbers alone. (§112 support: data-backed)

Core elements: simultaneous high salt rejection and high water flux, operating pressure regime described as 40–70 atm, application to seawater and general high-pressure water purification

Dependent ladder (broad → narrow):

  • operation on seawater at about 68 atm and about 25 °C — ties the use to the exact tested condition (99.43% rejection, ~43 gfd) as a concrete fallback (§112 support: data-backed)
  • operation within the described 40–70 atm pressure window — covers the typical high-pressure operating band described in the disclosure (§112 support: described, no data)
  • application to non-seawater high-pressure purification of aqueous feeds generally — broadest use extension; flagged speculative as an untested application (§112 support: speculative)

Blocking claims (for obvious design-arounds)

  • Workaround: Substituting a different aromatic diamine for m-phenylenediamine (e.g., another monomeric aromatic polyamine) while keeping the same crosslinking scheme Block with: A composition genus reciting any essentially monomeric aromatic polyamine reacted with the at-least-tri-functional aromatic acyl halide, so alternative aromatic amine monomers fall within the crosslinked-network barrier claim (§112 support: described, no data)

  • Workaround: Substituting a different aromatic acyl halide bearing three or more acyl-halide groups for trimesoyl chloride Block with: A genus reciting any essentially monomeric aromatic acyl halide with at least three acyl-halide functionalities, capturing higher-functionality or isomeric aromatic acid chlorides that produce the same crosslinked network (§112 support: described, no data)

  • Workaround: Adding a minor third co-monomer (e.g., a disulfonated diamine) or a dispersed polymeric additive to differentiate the film while retaining the MPD/TMC core Block with: A claim to the barrier as the reaction product of essentially only the two monomeric aromatic reactants, framed so that adding a non-essential co-monomer or additive does not escape the claim where the crosslinked aromatic polyamide network remains the operative selective barrier (§112 support: described, no data)

  • Workaround: Inserting a 2D-nanomaterial or other intermediate layer between support and barrier, or requiring a post-formation heat cure, to recharacterize the process Block with: A process/structure claim expressly reciting formation of the self-limiting crosslinked film directly on the microporous support without an intermediate deposition layer and without a required heat-cure, so those added steps do not read out of the claim (§112 support: described, no data)

  • Workaround: Tuning reactant concentrations away from ~2 wt% / ~0.1% w/v to argue a different film Block with: An independent concept resting on the self-limiting/network-forming character of the barrier (thickness self-termination governed by the at-least-tri-functional crosslinker) rather than on any single concentration, so concentration adjustments remain within scope (§112 support: data-backed)

Notes: §112 cautions for counsel to assess: (1) The MPD(~2 wt%)/TMC(~0.1% w/v) seawater example at ~68 atm/25 °C (99.43% rejection, ~43 gfd) and the synthetic-seawater flux data are the only data_backed anchors — the composition, process, and structure independent concepts and their MPD/TMC rungs draw on this support. (2) The broader genus rungs (any monomeric aromatic polyamine / any at-least-tri-functional aromatic acyl halide) are described_not_demonstrated; before relying on the full genus, counsel may want additional working examples across at least one alternative amine and one alternative acyl halide to shore up written-description and enablement across the claimed breadth. (3) The 40–70 atm range is described but only ~68 atm is exemplified — intermediate and lower-pressure performance is not demonstrated. (4) Non-seawater / general purification use is speculative (no data). (5) Per the architecture, do not rest any independent distinction on the flux/rejection figures alone — the surviving distinctions are structural/process-based (crosslinked network from an at-least-tri-functional acyl halide; two-component-only barrier; direct in-situ formation without surfactant, intermediate layer, or required heat-cure). (6) The method_of_use set is the weakest (predictable-use concern); counsel to weigh whether to file it at all versus relying on composition/process/structure. Novelty, non-obviousness, and validity determinations are reserved to counsel.

5.

Prior-Art Differentiation Notes

Per-Application Prior-Art Notes

Note

This is engineering work-product, not a legal opinion or a clearance/validity search. It names the legal standards; the patentability conclusions are the attorney’s.

How to read this section (the §103 framework, stated once): under Graham/KSR, obviousness turns on the scope and content of the prior art, the differences from the claims, the level of ordinary skill, and objective indicia — and any reason to combine references must be articulated, never hindsight. The per-application notes below POSITION each use against that framework; the deeper, claim-level inventive-step analysis is treated separately, at the level of the mechanism’s claims.

Each application is triaged as either "spec support only" (a predictable same-mechanism use — valuable as disclosure / spec breadth, but unlikely to support its own non-obvious claim) or "claim candidate" (required non-obvious adaptation — may merit a claim of its own).

High-pressure seawater desalination (origin field) — Thin-film composite reverse-osmosis membrane elements for seawater desalination plants operating at ~40–70 atm.

Closest existing work: Earlier interfacial-polymerization membranes and single-monomer (linear) polyamide films (D1, D2), plus prior high-rejection/low-flux RO membranes (D3); the retrieved MPD/TMC TFC patents and papers largely embody or postdate the invention's own chemistry and confirm the same mechanism rather than predate it.

Differentiation: Against the closest cited class, the invention's distinguishing named elements are the use of an at-least-tri-functional aromatic acyl halide (trimesoyl chloride, ~0.1% w/v) reacted with essentially monomeric m-phenylenediamine (~2 wt%) to form a CROSSLINKED aromatic polyamide barrier — versus the linear/single-monomer polyamide films of D2 — yielding the self-limiting sub-second ultrathin film with simultaneous ~99.4% rejection and ~43 gfd flux that D3's baseline membranes did not achieve (comparison is abstract-level for D1–D3, which are unnamed reference classes; §102 novelty and dating for counsel to assess).

Triage: claim candidate — the application required non-obvious adaptation; it may merit a claim of its own

Citations:

  • D2 — Single-monomer polyamide films — closest structural contrast; invention adds the tri-functional acyl halide crosslinking requirement absent from single-monomer linear films (provenance: grounded)
  • D1 — Earlier interfacial-polymerization membranes — same general deposition mechanism but not the specific monomeric MPD/TMC crosslinked system (provenance: grounded)
  • D3 — Prior RO membranes with >98% rejection but flux well below ~600 L/m²/day — performance baseline the simultaneous high-flux/high-rejection result is measured against (provenance: grounded)
  • CN111282447B (verify) — MPD + trimesoyl chloride on ultrafiltration support forming nanoscale ultrathin desalination layer — mirrors the core chemistry; verify dating as it appears to postdate the invention (provenance: verify_full_doc)

Standard: §102 novelty (for counsel to assess)

Inventive-step consideration (§103 argument): Under §103, D1 (interfacial polymerization) plus D2 (single-monomer polyamide films) already teach forming a polyamide film at a liquid–liquid interface on a support, so the inquiry narrows to whether the specific named departure — an essentially monomeric, at-least-tri-functional aromatic acyl halide (TMC ~0.1% w/v) reacted with ~2 wt% m-phenylenediamine to yield a crosslinked (not linear) aromatic polyamide as a self-limiting sub-1-second ultrathin film — would have been obvious over the difunctional/single-monomer art of record; D3 (>98% rejection but flux well below ~600 L/m²/day) frames the trade-off the claimed film allegedly overcomes.

Articulated reason (KSR): A PHOSITA aware of D1's interfacial technique and D2's polyamide films had a finite, identifiable set of ways to increase crosslink density — substituting a tri- or higher-functional acyl halide for a difunctional one is a predictable, KSR-type design choice to tighten the network for salt rejection; however, the record must show a reason to expect that this same substitution would simultaneously raise flux rather than merely density, since D3 documents the opposite (high rejection paired with low flux). Note: many retrieved MPD/TMC references appear to postdate this foundational disclosure and should be date-verified before being treated as §103 art rather than as later corroboration.

Reasonable expectation of success: A PHOSITA might reasonably expect that adding a third reactive site improves rejection through denser crosslinking, but the record does not supply a reason to expect the additional named result — that the reaction self-limits in under one second to form a film thin enough to yield ~43 gfd flux AT 99.3–99.5% rejection; that simultaneous high-flux/high-rejection outcome runs against D3's baseline and undercuts a clean expectation of success for the full claimed combination.

Secondary considerations (each needs a nexus):

  • Unexpected results — nexus: Strong facial nexus: simultaneous 99.43% rejection and ~43 gfd (~1754 L/m²/day) flux breaks the rejection/flux trade-off shown in D3, and is tied directly to the named tri-functional-crosslink + self-limiting sub-1-second ultrathin film — the specific features that distinguish over D1/D2.
  • Long-felt need — nexus: Nexus to the claimed high-flux-at-high-rejection membrane for seawater RO if the attorney can corroborate that pre-existing membranes (D3 class) forced plants to accept low flux; the need must be shown by a reference, not merely asserted.
  • Teaching away — nexus: D3's persistent low flux at >98% rejection arguably teaches away from expecting the crosslinked film to also be high-flux; nexus is to the ultrathin self-limiting film feature. Any broader assertion that the field believed crosslinking necessarily sacrifices flux rests on an uncorroborated asserted norm unless a reference of record states it — a reference showing the field already achieved both would defeat it.
  • Commercial success — nexus: No nexus established on the present record; would require evidence that TFC seawater RO commercial adoption is attributable to the claimed MPD/TMC crosslinked chemistry rather than to system-level or marketing factors.

Standard: §103 obviousness (for counsel to assess)

Organic solvent nanofiltration / solvent-resistant molecular separation — Membranes for recovering homogeneous catalysts, concentrating or purifying active pharmaceutical ingredients, and performing solvent exchange or molecular-weight fractionation in non-aqueous media.

Closest existing work: CN111282447B and the retrieved MPD/TMC TFC papers disclose the identical named chemistry — an aromatic polyamine (m-phenylenediamine) in the aqueous phase reacted with a tri-functional aromatic acyl chloride (trimesoyl chloride) via interfacial polycondensation on a microporous ultrafiltration support to form a crosslinked polyamide barrier — but every retrieved reference is directed to aqueous desalination/RO/FO water treatment, not organic-solvent feeds.

Differentiation: Claim-level against CN111282447B/US9156006B2: the invention's named elements (MPD, ≥tri-functional TMC, crosslinked aromatic polyamide TFC on porous support) are individually shown, so the core structure is anticipated for water use — but none of the provided references teach or operate the crosslinked network in non-aqueous/organic solvent feeds for solvent-resistant molecular sieving, catalyst recovery, or MW fractionation, which is the OSN wedge (§102 novelty / §103 obviousness for counsel to assess).

Triage: claim candidate — the application required non-obvious adaptation; it may merit a claim of its own

Citations:

  • CN111282447B (verify) — Nearly identical named chemistry — m-phenylenediamine aqueous phase + trimesoyl chloride organic phase on ultrafiltration support, ~10-120s contact — but directed to aqueous desalination, not organic solvent separation. (provenance: grounded)
  • US9156006B2 (verify) — TFC polyamide barrier on polysulfone/PES porous support; same architecture, water (FO/PRO) application only. (provenance: grounded)
  • JP5875201B2 (verify) — Aromatic polyamide active layer on porous support via interfacial polymerization; water-treatment separation membrane, no organic-solvent operation. (provenance: grounded)

Standard: §102 novelty (for counsel to assess)

Inventive-step consideration (§103 argument): The named novel elements (MPD ~2 wt% aqueous / TMC ~0.1% organic interfacial polycondensation on a microporous support yielding a crosslinked aromatic polyamide TFC) are disclosed in essentially identical form by CN111282447B, US9156006B2, and the MPD/TMC TFC papers — but every provided reference is directed to aqueous RO/FO/desalination feeds, not organic-solvent separation; the §103 question for this application is whether extending that known crosslinked membrane to non-aqueous solvent nanofiltration (catalyst recovery, API concentration, solvent exchange) is a predictable use of a known mechanism or a non-obvious redeployment.

Articulated reason (KSR): The at-least-tri-functional acyl-halide crosslinking that the disclosure identifies as the distinguishing move produces a network expected to resist swelling/dissolution — a property a PHOSITA facing solvent-stable sieving would recognize as directly on-point, supplying a rational reason to try the known MPD/TMC network in organic media; however, none of the provided references discuss organic-solvent feeds or solvent stability, so any motivation to leave aqueous applications must come from outside the cited art and risks hindsight if not corroborated.

Reasonable expectation of success: Fabricating the film is a solved, predictable process (many references reproduce MPD/TMC TFC), but success in organic solvent nanofiltration turns on chemical/mechanical stability and retained size-selectivity in non-aqueous media — a variable not addressed by any provided reference (all report aqueous salt rejection/flux), so a PHOSITA would face genuine uncertainty about swelling, defect formation, and rejection performance in solvents, tempering the expectation of success.

Secondary considerations (each needs a nexus):

  • Teaching away / field would not target organic feeds — nexus: The disclosure asserts a water-membrane practitioner would not target organic feeds; this rests on an uncorroborated asserted norm — a reference showing solvent-stable crosslinked polyamide OSN membranes already exist would defeat it, and no provided reference either supports or rebuts it.
  • Unexpected results (solvent stability enabling molecular sieving outside water) — nexus: Nexus would run directly to the tri-functional-crosslinking element that yields the swelling-resistant network, but the disclosure provides only aqueous seawater data (99.3–99.5% rejection, ~43 gfd); no OSN performance data is presented, so any unexpected-results argument for this application is presently unsupported by the record.
  • Long-felt need (solvent-stable molecular separation for pharma/catalyst recovery) — nexus: Plausible nexus to the crosslinked barrier's solvent resistance, but no provided reference documents the need or prior failures; the pull is asserted, not corroborated by the cited art.

Standard: §103 obviousness (for counsel to assess)

Water nanofiltration (softening / selective ion separation) — Loose-network membranes for hardness and sulfate removal, dye/salt fractionation, and micropollutant rejection at low operating pressure.

Closest existing work: Interfacial-polymerization TFC membranes made by reacting a polyfunctional aromatic amine (including m-phenylenediamine) with trimesoyl chloride on a porous support, as in CN111282447B, which also lists piperazine and other amines and explicitly claims TMC — piperazine being the classic loose-network/NF monomer; the inventor-cited class references D1 (earlier interfacial-polymerization membranes) and D2 (single-monomer polyamide films) also bound this space.

Differentiation: At the abstract/claim level, CN111282447B recites the same interfacial-polymerization sequence with the same MPD/TMC (at-least-tri-functional acyl halide) chemistry the invention names, so the named elements here (essentially-monomeric aromatic polyamine + tri-functional aromatic polyacyl halide forming a self-limiting crosslinked aromatic polyamide) are largely present in the retrieved art; the present application's only distinction is re-tuning the crosslinked network more open to pass monovalent salts while sieving divalent ions/organics, which is not a distinct named element but a degree-of-crosslink adjustment — §102/§103 scope for counsel to assess.

Triage: spec support only — a predictable same-mechanism use; valuable as disclosure / spec breadth, but unlikely to support its own non-obvious claim

Citations:

  • CN111282447B (verify) — Claims interfacial polymerization of a polyfunctional organic amine (including m-phenylenediamine) with trimesoyl chloride on an ultrafiltration support to form a nanoscale ultrathin separation layer — the same mechanism and monomers, differing only in network tuning. (provenance: grounded)
  • JP5875201B2 (verify) — Polyamide active layer (MPD/TMC-type) on a porous support characterized by carboxyl/amide ratio — same crosslinked aromatic polyamide barrier architecture. (provenance: grounded)
  • US9156006B2 (verify) — Thin-film composite membrane with semi-permeable selective barrier on a polysulfone/polyethersulfone porous support — same TFC architecture applied to related water-treatment membranes. (provenance: grounded)

Standard: §102 novelty (for counsel to assess)

Condensed entry: triaged spec-support-only, so the full §103 positioning is reserved for claim-candidate applications and the origin field.

Gas separation / carbon capture — Thin-film composite membranes for CO2/CH4 (natural-gas sweetening), CO2/N2 (flue-gas capture), H2 recovery, and air separation.

Closest existing work: MPD/TMC interfacial-polymerization thin-film composite polyamide membranes on microporous supports — the exact chemistry and TFC architecture of the invention — but every provided reference is directed to liquid-phase separations (reverse osmosis, forward/pressure-retarded osmosis, pervaporation, dye removal), not gas separation.

Differentiation: At the abstract level (retrieved patent claims are RO/FO-specific), no provided reference discloses using the self-limiting interfacial-polycondensation MPD/TMC ultrathin crosslinked polyamide skin as a selective barrier for gas transport (CO2/CH4, CO2/N2, H2, air); the named novel elements (essentially-monomeric MPD + at-least-tri-functional TMC forming a sub-second self-limiting crosslinked film) appear only in a liquid-solute-rejection context, with the gas-permeance/gas-selectivity transport regime and defect requirements unaddressed — §102/§103 for counsel to assess.

Triage: claim candidate — the application required non-obvious adaptation; it may merit a claim of its own

Citations:

  • CN111282447B (verify) — Closest core-chemistry match: MPD + trimesoyl chloride interfacial polymerization forming a nanoscale ultrathin polyamide separation layer on an ultrafiltration support — but directed to desalination, not gas separation. (provenance: grounded)
  • US9156006B2 (verify) — TFC membrane with polysulfone/polyethersulfone porous support and semi-permeable selective barrier; same architecture but liquid forward/pressure-retarded osmosis use, no gas transport. (provenance: grounded)
  • JP5875201B2 (verify) — Polyamide active layer on porous support for water treatment; same polyamide-on-support architecture, liquid-phase only. (provenance: grounded)
  • CN112023732B (verify) — Polyamine/polyacyl-chloride polyamide separation layer TFC (forward osmosis); same interfacial chemistry, no gas separation. (provenance: grounded)

Standard: §102 novelty (for counsel to assess)

Inventive-step consideration (§103 argument): Every provided reference—D1–D3 and all retrieved patents/papers (JP5875201B2, US9156006B2, CN111282447B, CN112023732B, and the MPD/TMC papers)—teaches the identical MPD/TMC interfacial-polycondensation TFC architecture only for liquid-phase water treatment (RO, forward osmosis, pervaporation); none addresses gas separation, so under §103 the question is whether a PHOSITA would extend the self-limiting ultrathin crosslinked aromatic polyamide skin to CO2/CH4, CO2/N2, H2, or air separation. The named novel elements (2 wt% m-phenylenediamine, 0.1% w/v trimesoyl chloride, at-least-tri-functional acyl halide crosslinking, sub-1-second self-limiting film) are all recited in the water-membrane art, so the only potential distinction lies in the gas-transport application itself, which no reference discloses.

Articulated reason (KSR): A PHOSITA seeking a defect-free ultrathin selective skin on a porous support—the recognized architecture for maximizing permeance—could look to the mature interfacial-polymerization art, and KSR would treat transplanting a known film-forming mechanism into gas separation as a predictable use; however, the provided references supply no teaching, suggestion, or design incentive pointing toward gas separation, and the gas transport regime (solution-diffusion, sorption-selectivity) is governed by different physics than the hydrated-ion size-exclusion the references optimize, so any reason to combine risks resting on hindsight absent a reference bridging the two regimes.

Reasonable expectation of success: A dense crosslinked aromatic polyamide optimized for water flux via its hydrophilic hydrogen-bonding network and charged carboxyl groups (see JP5875201B2's -COOH/-CONH tuning) would give a PHOSITA no assurance it delivers useful CO2/CH4 or CO2/N2 selectivity or permeance, because gas-phase separation depends on sorption and diffusion of non-condensable species rather than water/ion partitioning; the absence of any gas-permeation data in the disclosure or references undercuts a reasonable expectation of success in the new regime.

Secondary considerations (each needs a nexus):

  • Teaching away / different transport regime — nexus: The claimed film is characterized entirely by aqueous salt rejection and water flux; the assertion that gas separation is a 'far, non-obvious extension' because transport physics differ rests on an uncorroborated asserted norm—a reference showing MPD/TMC polyamide already used for gas separation would defeat it, so counsel should search that specific art.
  • Unexpected results — nexus: No gas-separation performance data are provided (the extension is speculative/described-not-demonstrated), so no unexpected result is shown for the gas application and this carries no weight as presently supported.
  • Long-felt need / energy-sector pull — nexus: Membrane-based carbon capture and natural-gas sweetening are recognized needs, but nexus to the specific named elements (MPD/TMC self-limiting crosslinked skin) is unestablished absent evidence that this particular chemistry solves the gas-separation problem others failed to solve.

Standard: §103 obviousness (for counsel to assess)

Brackish and industrial high-pressure water purification (origin field) — Reverse-osmosis modules for brackish groundwater, boiler feed, semiconductor-grade ultrapure water, and wastewater reuse.

Closest existing work: Interfacial-polymerization desalination membranes made from m-phenylenediamine (aqueous) and trimesoyl chloride (organic) on a porous ultrafiltration support — most directly CN111282447B (claimed method reciting MPD-class polyamine + TMC-class tri-functional acyl chloride on a polysulfone/PES support) and the multiple MPD/TMC TFC papers; the inventor-cited D1–D3 describe the earlier-generation interfacial and single-monomer films plus the >98%-rejection/low-flux baseline.

Differentiation: Abstract/claim-level (CN111282447B has claim text): the invention's named elements — essentially monomeric ~2 wt% MPD reacted with ~0.1% w/v at-least-tri-functional TMC to form a self-limiting crosslinked aromatic polyamide barrier in <1 s at ~10 s contact — closely overlap CN111282447B's recited MPD/TMC-on-porous-support process, so the distinction for §102/§103 (for counsel to assess) rests on the specific self-limiting sub-second ultrathin film and the simultaneous 99.3–99.5% rejection / ~1754 L/m²/day flux window versus the prior >98%/<600 L/m²/day baseline (D3), not on the monomer identities themselves.

Triage: spec support only — a predictable same-mechanism use; valuable as disclosure / spec breadth, but unlikely to support its own non-obvious claim

Citations:

  • CN111282447B (verify) — Claims a desalination composite-membrane method using MPD-class polyfunctional amine (0.001–5%) and TMC-class polyfunctional acyl chloride (0.01–2%) on a porous UF support with ~10–120 s oil-phase contact — nearly the same named elements in the same origin field. (provenance: grounded)
  • JP5875201B2 (verify) — Polyamide active layer on porous support for water treatment (MPD/TMC-type polyamide), overlapping the crosslinked aromatic polyamide barrier and TFC architecture. (provenance: grounded)
  • D3 — Inventor-cited baseline of prior RO membranes at >98% rejection but flux well below ~600 L/m²/day — the performance gap the invention's simultaneous high-flux/high-rejection numbers are measured against. (provenance: grounded)

Standard: §102 novelty / §103 obviousness (for counsel to assess)

Inventive-step consideration (§103 argument): Under §103, this application is the invention's origin field applied to lower-salinity (brackish/industrial) feeds, so it adds essentially no independent non-obviousness beyond the core MPD/TMC crosslinked-polyamide TFC membrane itself — running the demonstrated seawater-grade film on easier, lower-osmotic-pressure feeds is a predictable use of the same self-limiting interfacial-polycondensation chemistry. The genuine §103 weight rests on whether the named core elements (essentially monomeric ~2 wt% m-phenylenediamine reacted with at-least-tri-functional ~0.1% trimesoyl chloride on a microporous support) were themselves disclosed or suggested by the references; several retrieved references (e.g., CN111282447B, the multiple MPD/TMC TFC papers) recite precisely this monomer pair on a polysulfone/ultrafiltration support — counsel must verify each reference's publication date against the priority date before treating it as prior art.

Articulated reason (KSR): A PHOSITA seeking to treat brackish/industrial feeds would predictably apply a membrane already shown to reject seawater NaCl at 99.4%, motivated by D3's identified problem (prior RO exceeded 98% rejection but only at flux well below ~600 L/m²/day) and the disclosure's own point that decoupling barrier chemistry from the support lets the same film run on easier feeds — no hindsight is needed because the harder separation inherently encompasses the easier one.

Reasonable expectation of success: High for this application specifically: brackish/industrial feeds present lower osmotic pressure and salt load than the demonstrated seawater case, so a PHOSITA would reasonably expect the demonstrated rejection/flux to be met or exceeded; the expectation for the core chemistry itself is a separate question turning on whether the tri-functional-acyl-halide crosslinking and monomeric-diamine selection were routine at the priority date.

Secondary considerations (each needs a nexus):

  • Unexpected results / simultaneous high flux and high rejection — nexus: Strong nexus to the core named elements — the at-least-tri-functional TMC crosslinking combined with monomeric MPD yielding ~1754 L/m²/day at 99.4% rejection versus D3's <600 L/m²/day baseline — but the nexus attaches to the core invention, not to anything added by the brackish/industrial application, which is merely an easier operating regime.
  • Long-felt need (high-recovery, high-flux purification of brackish/industrial water) — nexus: Nexus plausible via D3's articulated flux-vs-rejection tradeoff, but this application is undemonstrated (described/speculative) for these feeds, so any long-felt-need showing rests on the core membrane data rather than application-specific results.
  • Teaching-away (that tri-functionality is required to break the flux/rejection tradeoff) — nexus: Rests on an uncorroborated asserted norm about prior single-monomer/difunctional films (D2); a retrieved reference showing the field already used tri-functional acyl halides on microporous supports (CN111282447B lists trimesoyl chloride; multiple papers use TMC) would defeat this — counsel should confirm relative dates.

Standard: §103 obviousness (for counsel to assess)

Osmotically driven processes (forward osmosis / pressure-retarded osmosis) — Membranes for concentration and dewatering (FO) and for salinity-gradient power generation (PRO).

Closest existing work: US9156006B2 — a thin-film composite membrane expressly for forward osmosis and pressure-retarded osmosis, comprising a porous polysulfone/polyethersulfone support engineered with a defined structural parameter (~676 μm), specified two-sided pore-size distributions, and a dispersed polymeric additive, topped by a generic 'semi-permeable selective barrier'; CN111282447B and the MPD/TMC papers cover the interfacial polyamide chemistry itself.

Differentiation: Claim-level: US9156006B2 claims the FO/PRO adaptation in the SUPPORT (structural parameter, pore sizes, polymeric additive) with only a generic 'semi-permeable selective barrier' — it does not claim the invention's named barrier chemistry (essentially monomeric m-phenylenediamine ~2 wt% aqueous reacted with an at-least-tri-functional trimesoyl chloride ~0.1% w/v organic forming a self-limiting sub-second crosslinked aromatic polyamide). Conversely CN111282447B and the MPD/TMC references disclose that exact chemistry but for RO/desalination, not the osmotically driven FO/PRO use. §102/§103 for counsel to assess.

Triage: spec support only — a predictable same-mechanism use; valuable as disclosure / spec breadth, but unlikely to support its own non-obvious claim

Citations:

  • US9156006B2 (verify) — Directly targets FO/PRO TFC membranes — same application domain — but locates novelty in support engineering and leaves the selective barrier chemistry generic, not the claimed MPD/TMC self-limiting polyamide. (provenance: grounded)
  • CN111282447B (verify) — Discloses the same MPD + trimesoyl chloride interfacial ultrathin polyamide chemistry (aqueous polyamine + polyfunctional acyl chloride) but for desalination, not osmotically driven processes. (provenance: grounded)
  • CN112023732B (verify) — Forward-osmosis polyamide composite membrane using polyamine/polyacyl chloride interfacial polymerization, but distinguished by a 2D-nanomaterial intermediate layer — relevant to FO domain overlap. (provenance: grounded)

Standard: §102 novelty / §103 obviousness (for counsel to assess)

Condensed entry: triaged spec-support-only, so the full §103 positioning is reserved for claim-candidate applications and the origin field.

6.

Candidate Filings & Family Structure

Filing Strategy

File one comprehensive jumbo provisional that bundles the core subject matter — the self-limiting ultrathin crosslinked interfacial-polymerization barrier formed by reacting an essentially monomeric aromatic polyamine with an at-least-tri-functional aromatic polyacyl halide — and stretches its written description across all six application fields. Within the 12-month non-extendable priority window, convert that provisional into a single shared detailed description that is deployed as a US non-provisional plus foreign/PCT filings, each carrying a DIFFERENTIATED CLAIM SET (seawater RO claims first and narrowest to the demonstrated data; broader platform and application-specific claims layered on top). Draft the description once and reuse it across conversions so the incremental per-conversion attorney fee is a fraction of a standalone filing rather than a fresh full cost. Prioritize the data-backed origin-field (seawater desalination) claims for the first, defensible layer, and treat the far non-obvious wedges (organic solvent nanofiltration, gas separation) as high-value claim families to build out as supporting data matures.

Recommended Filings

  • provisional — Jumbo provisional covering the crosslinked interfacial-polymerization TFC platform (monomeric aromatic polyamine + at-least-tri-functional aromatic polyacyl halide barrier on microporous support), anchored by the seawater desalination working examples (99.43% rejection, ~43 gfd at ~68 atm) and extending the written description to brackish/industrial RO, water nanofiltration, organic solvent nanofiltration, gas separation, and osmotically driven (FO/PRO) fields.

    • Establishes the earliest priority anchor for the whole moat in one document; the origin-field data provides the strongest support, while the broad description reserves position across the adjacent and far fields for a low incremental cost. Verify all dates/deadlines with counsel.

  • non_provisional — US non-provisional built from the shared detailed description, with a differentiated claim set led by seawater/high-pressure RO membrane and method claims tied to the demonstrated examples, plus dependent/independent layers reaching the broader crosslinked-platform and re-tuned-network embodiments.

    • Files first and narrowest where the closest, densest prior art lives (earlier interfacial-polymerization and single-monomer polyamide films); the demonstrated data supports the core defensive layer. Verify with counsel.

  • pct — PCT application off the same shared description to preserve foreign scope across the same fields, enabling later national-phase entry.

    • 12-month priority claim to the provisional, ~30-month national-phase runway to defer country selection and stage costs while the speculative fields accumulate data. Verify all dates with counsel.

  • continuation — Later continuation(s) to pursue additional claim sets (e.g., broader monomer-class claims, water-NF re-tuned network claims) drawn entirely from the jumbo provisional / shared description with no new matter.

    • Inherits the original priority date since no new matter is added; lets the attorney keep prosecution flexible and mine additional claim scope as the market and prior-art picture develop. Verify with counsel.

  • divisional — Reserved for any restriction requirement that separates, e.g., composition/membrane claims from method-of-separation claims or distinct application-field claim groups.

    • Restriction-driven filing preserving the parent date for the non-elected group if the examiner deems claims to cover independent/distinct inventions. Verify with counsel.

  • cip — Optional continuation-in-part IF new data (e.g., organic-solvent-nanofiltration stability results, gas permeance/selectivity data, or FO structural-parameter data) is generated after the provisional and needs to be added to support the far-field claims.

    • Use only if new matter must be introduced. A CIP has a SPLIT priority date: claims fully supported by the parent/provisional disclosure retain the earlier date, while claims that rely on the newly added data receive the later CIP filing date — it does not carry the whole application back to the parent date. Verify with counsel.

Disclosure Gaps (per application)

  • High-pressure seawater desalination (#1) (data_backed): Well-supported already by the working examples; strengthen by demonstrating members of the broader monomer class (polyamines other than MPD, tri-functional acyl halides other than TMC) to underpin genus-level claims rather than only the specific MPD/TMC species.

  • Brackish and industrial high-pressure water purification (#5) (described_not_demonstrated): Performance data on lower-salinity feeds (brackish groundwater, boiler feed, semiconductor-grade ultrapure water, wastewater reuse) at high recovery; the disclosure asserts these follow inherently from seawater-grade separation but does not separately demonstrate them.

  • Water nanofiltration / softening (#3) (speculative): Data for the deliberately loosened network: divalent/monovalent selectivity (hardness and sulfate rejection vs. monovalent passage), dye/salt fractionation, and micropollutant rejection at low operating pressure, plus the process conditions used to tune the network more open.

  • Osmotically driven processes FO/PRO (#6) (speculative): Osmotic-flux data, solute rejection under FO/PRO conditions, membrane structural parameter / internal concentration-polarization characterization, and power-density figures for PRO.

  • Organic solvent nanofiltration (#2) (speculative): Solvent-stability evidence — swelling/dissolution resistance in representative organic solvents, molecular-weight cutoff and rejection in non-aqueous media, long-term stability, and example catalyst/API separations that show the tri-functional crosslinked network actually delivers solvent-stable sieving.

  • Gas separation / carbon capture (#4) (speculative): Gas permeance and selectivity data for the target pairs (CO2/CH4, CO2/N2, H2 recovery, air separation), demonstration of defect-free/pinhole-free ultrathin skin performance in the dry-gas regime, and conditions confirming the liquid-phase architecture translates to gas transport.

7.

Grounding & Search Log

Grounding Summary

Note

Of 6 application(s) analyzed for prior art:

  • 6 grounded (claim text was available for 5 of 14 retrieved references; the comparison is abstract-level for the rest)

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