Electrodialysis Durability Patents: Leaders & White Space 2026
- Filing has flattened, not grown. activity peaked in 2020 at 5 records and the 2022 midpoint sits at zero, so this is a mature, quiet claim space rather than a rising one.
- One Indian research pairing anchors the field. the strongest co-assignee link, between a national research council and an energy research centre, is more than three times denser than any other pairing in the dataset.
- Membrane chemistry, not stack engineering, carries the claims. C08J polymer processing appears in 15 of 20 records, well ahead of the separation-process and water-treatment codes filed alongside it.
What this landscape covers
Electrodialysis and electrodialysis-reversal stacks live or die on the ion-exchange membrane’s ability to survive oxidative attack, thermal cycling and years of continuous fouling exposure. This landscape tracks patent families that combine electrodialysis stack claims with explicit language on chemical stability, oxidative stability or long-term membrane durability, filtered to the IPC codes covering membrane preparation (B01D67, C08J5/22) and dialysis separation (B01D61/44).
Twenty published families meet that combined test across 2015 to mid-2026. That is a small, tightly scoped corpus by design: it isolates durability-specific claims from the much larger body of general electrodialysis and ion-exchange-membrane filing, so the counts below should be read as a durability sub-field, not the whole electrodialysis market.
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Filing trend and technology mix
Two views of the same 20-family corpus: how filing has moved year over year, and which technology classes those families sit in.
A flat trend line since the 2020 peak
Filings rose to a peak of 5 in 2020, then fell back; the 2022 midpoint reads zero and 2026 (partial) also reads zero. Because publication typically lags filing by around 18 months, the most recent one to two years will always look thinner than they eventually turn out to be — but even allowing for that lag, there is no visible resurgence between 2020 and now.
Concentrated in polymer chemistry, spread across water treatment
C08J (polymer processing and solutions) covers 15 of the 20 records, making membrane material chemistry the dominant claim territory. B01D (separation processes) and C02F (water and wastewater treatment) each appear in 9 records, reflecting that most durability claims are filed as part of a broader stack or treatment-system application rather than standing alone. Catalysis, nitrogen-compound and organo-metallic codes each register only one or two records, marking those as peripheral rather than core to this durability niche.
Shares are the percentage of the 20 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Electrodialysis Environmental Durability with Eureka
This page is one run against one query. Ask Eureka your own question about electrodialysis environmental durability and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
WO2015015513A3 — Anion exchange membrane for electrodialysis applications and process for the preparation thereof
The present invention relates to the preparation of novel anion exchange membranes from bicomponent or tricomponent copolymers containing both quaternizable and cross-linkable moieties. The bicomponent copolymers are copolymers of acrylonitrile and 2-dimethylaminoethyl methacrylate, and the tricomponent copolymers add n-butyl acrylate. Quaternization by methyl iodide followed by cross-linking with hydrazine hydrate produces membranes with high ion exchange capacity (1.30-1.50 meq/g) and high transport number.Filed by the Council of Scientific & Industrial Research, this family and its later US and WO continuations account for two of the three most-cited records in the corpus.
View full filing| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2020261295A1 | Fluorinated-aliphatic hydrocarbon based stable anion- exchange membrane and its method of preparation thereof | 3 |
| 2 | WO2015015513A2 | Anion exchange membrane for electrodialysis applications and process for the preparation thereof | 2 |
| 3 | US9745432B2 | Anion exchange membrane for electrodialysis applications and process for the preparation thereof | 2 |
Citation counts are drawn from a corpus that skews toward older filings receiving more downstream references; treat them as a signal of influence within this niche, not as a ranking of current technical merit.
Publication numbers are shown where the record carries one (3 of 3 rows); clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers say about this niche
Three findings that shape how a filing or freedom-to-operate strategy should treat this space.
Activity has stalled, not scaled
After peaking at 5 filings in 2020, the corpus shows no filings at the 2022 midpoint and none yet in the current partial year. Publication lag means 2025-2026 could still fill in, but the multi-year plateau before that is real.
Membrane polymer chemistry is the pressure point
Durability claims cluster overwhelmingly in polymer processing and composition (C08J), not in stack hardware or separation-process engineering. Anyone filing here is filing against copolymer, cross-linking and functionalisation chemistry first.
One institutional pairing dominates co-filing
The link between a national scientific research council and an energy-sector research centre is more than three times stronger than any other co-assignee pair in the corpus, out of only 4 pairs total. Ownership outside that cluster is fragmented.
India leads receiving-office volume
India accounts for the largest single share of receiving-office filings, ahead of the United States and PCT (WIPO) routes, with Australia, Canada and the EPO each taking a smaller share.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to electrodialysis environmental durability, with the prior art for and against each one.
Who holds the claims
Assignee activity in this corpus is small and institutionally concentrated rather than corporate and distributed, which changes how a newcomer should read freedom-to-operate risk.
Council of Scientific & Industrial Research + ONGC Energy Centre
This Indian research-council and energy-centre pairing is the single strongest co-assignee link in the corpus, spanning the anion-exchange membrane chemistry that also produces the most-cited filings.
Katti + Kadvekar
A named-inventor pairing appears as a secondary but distinct filing cluster, separate from the institutional assignee records, suggesting personnel continuity across filings rather than a new competing organisation.
Asahi Kasei Corporation
Asahi Kasei appears as a standalone corporate assignee rather than part of the dense co-filing cluster, indicating an independent membrane-chemistry filing programme rather than a collaborative one.
| Assignee | Recent year | YoY |
|---|---|---|
| Council of Scientific & Industrial Research (CSIR) | 0 | — |
| ONGC Energy Centre | 0 | — |
| Asahi Kasei Corporation | 0 | — |
| SANJEEV SHRINIWAS KATTI | 0 | — |
| CHANDRASHEKHAR VINAYAK KADVEKAR | 0 | — |
| ONGC ENERGY CENT OIL & NATURAL GAS CORP ITD | 0 | — |
| KATTI SANJEEV SHRINIWAS | 0 | — |
| KADVEKAR CHANDRASHEKHAR VINAYAK | 0 | — |
Where to take this analysis
The corpus is small enough to read in full, but that also means the gaps matter as much as the concentration.
Model the white space claims
Run the under-claimed sub-areas above against your own membrane chemistry to see whether a first claim is realistically open or whether it collides with a broader B01D67 filing.
Explore in EurekaTrack the lead cluster's next move
With the strongest co-assignee pairing showing zero filings in the latest year, watch for whether that research pairing resumes filing or whether a new entrant fills the gap.
Set up monitoring in EurekaCommon questions on this landscape
Within this 20-family corpus, the densest ownership cluster is a co-filing pairing between an Indian national research council and an energy-sector research centre, linked across 7 records. No single corporate assignee comes close to that volume; Asahi Kasei appears as an independent filer, and the rest of the corpus is spread across individual inventors and smaller entities. This is a fragmented field outside that one institutional cluster, which matters for freedom-to-operate: there is no single dominant corporate blocker to clear.
Filing peaked at 5 records in 2020 and has been flat to declining since, with the 2022 midpoint and the current partial year both showing zero. Because patent publication typically lags actual filing by around 18 months, the most recent one to two years will likely fill in somewhat as pending applications publish. Even accounting for that lag, the multi-year plateau before 2026 suggests this is a mature niche rather than one attracting fresh investment.
Membrane polymer chemistry, classified under C08J, appears in 15 of the 20 records and is the dominant claim territory — covering copolymer composition, cross-linking chemistry and functionalisation methods. Separation-process claims (B01D) and water-treatment system claims (C02F) each appear in 9 records, usually as part of the same filing rather than standalone. Catalysis, nitrogen-compound chemistry and organo-metallic claims are peripheral, each covering only one or two records.
WO2015015513A3 claims anion-exchange membranes made from bicomponent or tricomponent copolymers of acrylonitrile with 2-dimethylaminoethyl methacrylate, quaternized with methyl iodide and cross-linked with hydrazine hydrate, targeting specific ion-exchange capacity and transport-number ranges. It and its related US and WO continuations are among the most-cited records in this corpus, so anyone using that specific copolymer-and-cross-linker combination should review the claim scope closely. It does not block membrane chemistry built on different backbone polymers or different cross-linking chemistry, which is where the open claim space in this niche sits.
The current corpus concentrates on acrylonitrile-based anion-exchange copolymer chemistry, leaving branches like fluorinated backbone chemistry, fouling-resistant surface coatings, and catalytic membrane regeneration methods with little dedicated filing despite sitting inside the same IPC scope. Thermal-cycling test protocols and organo-metallic cross-linker approaches are also thin. Because the whole corpus is only 20 families, these gaps should be verified against the broader (non-durability-filtered) electrodialysis patent base before assuming they are truly open.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.