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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/ion-exchange-resins-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Polymers & ResinsIon Exchange Resins Patents: Who Holds the Core Claims, and Where They Thin Out
- Filings have cooled since the 2021 peak. 79 families that year against 42 in 2017 and just 2 in the latest, still-incomplete year — a plateau rather than a growth story.
- Claim activity clusters tightly in B01J. 2,336 of 2,380 records sit inside chemical/physical processes and catalysis, with water treatment (C02F) and separation (B01D) as the next-largest but much thinner bands.
- Recent-year momentum has gone flat across the named incumbents. Every assignee tracked for year-over-year movement shows zero filings in the latest year, including a recorded -100% YoY drop — a sign the field is being defended, not expanded.
2,380
Published Records
19%
Top-5 Share of All Records
-68%
Filing Growth 2021→2024
JP
Leading Jurisdiction
Filing growth compares 2021 (79 records) with 2024 (25) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 2,380 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··8 min readSourced from Patsnap Eureka
Overview
What the ion exchange resin patent record shows
Ion exchange resins sit at the intersection of polymer chemistry and separations engineering, and the patent record reflects that split. The search set spans 2,380 patent families filed between 2017 and the 2026 cut-off, concentrated overwhelmingly under B01J — the classification covering chemical and physical processes and catalysis — with meaningful secondary activity in water treatment, filtration and vinyl-addition polymer chemistry. Filing volume peaked in 2021 at 79 families and has not returned to that level since, though the most recent year is always undercounted because publication lags filing by roughly eighteen months.
Reading the ranking and the co-filing pairs together, the field looks like a small set of long-established resin makers holding dense, overlapping claim territory rather than a wave of new entrants. That pattern matters for anyone drafting new claims: the crowded core is expensive to enter, but the thinner secondary classifications may still have room.
Filing volume by year, 2017-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Ion Exchange Resins covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The Numbers
Filing trend and technology composition
Two views of the same 2,380-family dataset: how filing volume has moved year on year, and how that volume splits across the IPC subclasses that make up the ion exchange resin field.
A 2021 peak followed by a decline
Filings rose from 42 in 2017 to a peak of 79 in 2021, then eased back toward the 2022 midpoint of 38 and continued lower into the partial final year. That shape is more consistent with a maturing, well-defended field than an emerging one — most of the foundational claim space was staked out before the peak, and later filings look like refinements and defensive continuations rather than new territory.
B01J dominates; everything else is secondary
B01J appears in 2,336 of 2,380 records, meaning the field is defined by resin chemistry and catalytic process claims first. Water treatment (C02F, 768) and separation processes (B01D, 648) are the largest application-side classes, while addition polymers (C08F, 460), acyclic compound chemistry (C07C, 303) and polymer processing (C08J, 301) form a mid-tier of adjacent claim territory. Metal extraction (C22B, 153) and analytical testing (G01N, 115) are the smallest bands — thin enough to be worth a closer look for open claim space.
Shares are the percentage of the 2,380 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Ion Exchange Resins covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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The most-cited prior art in this field
Representative Filing
Methods for preparation of weak acid cation exchange resin, weak acid cation exchange resin, and down stream products made using the resins
BOHLING, JAMES CHARLES
The filing describes converting a swollen-form weak acid cation exchange resin to an unswollen form and steam-cleaning it to produce a cleaned resin, together with downstream products and systems — including potable water purification systems and disposable cartridges — that use the improved resin.Abstract text as filed; number, assignee and filing date are rendered alongside this record.
View full filing detailsHighest-citation records in the searched corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4615806A | Removal of iodide compounds from non-aqueous organic media | 254 |
| 2 | US4224415A | Polymerization processes and products therefrom | 250 |
| 3 | US6225129B1 | Large capacity acid or base generation apparatus and method of use | 197 |
| 4 | US5281631A | Phosphonic acid based ion exchange resins | 146 |
| 5 | US3876565A | Ion exchanger - polyolefin membranes | 139 |
| 6 | US4256840A | Macroreticular cation exchange beads and preparation of same | 138 |
| 7 | US3925019A | Chromatographic analysis of ionic species | 125 |
| 8 | US6682701B1 | Large capacity acid or base generator apparatus | 123 |
| 9 | US4265634A | Chromatographic separation and quantitative analysis of ionic species | 121 |
| 10 | US4321145A | Ion exchange treatment for removing toxic metals and cyanide values from waste waters | 113 |
Citation counts favour older filings simply because they have had more time to accumulate citations within a searched corpus; treat this table as a map of foundational and heavily-referenced art, not a ranking of current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Ion Exchange Resins covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the filing pattern tells a strategist
Three findings that shape where a new filing has a realistic chance of standing, and where it will simply add to an already-dense pile.
Concentration
2,336 of 2,380 records in B01J
share of corpus in one subclass
The core chemistry is almost entirely claimed under one classification
With B01J covering 98% of the corpus, new resin-composition and process claims are competing directly against the densest part of the prior art. Differentiation is more likely to come from application-specific integration — water treatment, metal extraction, analytical use — than from another general-purpose resin composition claim.
Source: IPC subclass counts, this dataset
Momentum
79 families in 2021, down toward single digits by 2026
peak-to-latest filing swing
The field has passed its filing peak
Volume climbed from 42 families in 2017 to a peak of 79 in 2021, then declined through the 2022 midpoint of 38 toward a low, partial final year. Combined with flat or zero recent-year filings across the named incumbents, this points to a field being maintained rather than expanded.
Source: annual filing trend, this dataset
Co-filing
10 recorded co-assignee pairs
strongest pair count: 6
Collaboration is limited and concentrated among a few pairings
Only ten co-assignee pairs appear in the dataset, with the strongest tied at six joint filings. That is a small number relative to 2,380 families, meaning most patenting in this field happens under a single assignee rather than through joint development — worth checking before assuming a partnership route is common practice here.
Source: co-assignee pair counts, this dataset
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to ion exchange resins, with the prior art for and against each one.
Collaboration signal
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Mitsubishi Chemical Corporation | Kurita Water Industries Ltd. | 6 |
| Rohm and Haas Company | Dow Global Technologies LLC | 5 |
| Rohm and Haas Company | Rohm and Haas Company | 5 |
| Miura Co., Ltd. | Miura Protec Co., Ltd. | 4 |
| Rohm and Haas Company | Rohm and Haas Company | 2 |
| Kurita Water Industries Ltd. | Fukuoka Prefecture Federation of Agricultural Cooperatives | 2 |
| Dionex Corporation | HATCH MELVIN | 2 |
| Rohm and Haas Company | YAGISHASHI TAKEO | 1 |
The strongest co-assignee pairs recur around resin manufacturers and their regional or corporate affiliates, consistent with intra-group filing rather than open industry partnership.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Ion Exchange Resins covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who holds the ground, and how it moves
The assignee ranking is dominated by long-established resin and water-treatment manufacturers. Recent-year momentum across those same names has gone flat, which changes how a newcomer should read the ranking: high historical share does not currently mean high current filing pressure.
Incumbent pattern
0 filings in latest year across tracked incumbents
recent-year momentum
Historic leaders have stopped adding volume
Every named assignee tracked for year-over-year movement — spanning Japanese, US and Chinese resin and water-treatment manufacturers — shows zero filings in the most recent year, with at least one recording a full -100% year-on-year drop. That is consistent with a field where the core portfolio is complete and being defended through maintenance rather than fresh filing.
Source: recent-year momentum by assignee
Geography
Japan 520, US 459, EPO 367, China 224
top receiving offices
Filing is spread across four major offices with no single dominant gate
Japan and the United States lead as receiving offices, followed closely by the EPO and then China, Canada and WIPO/PCT filings at lower but still meaningful volumes. A freedom-to-operate review for this field needs to clear at least these four jurisdictions rather than assuming US or China alone is sufficient.
Source: receiving office counts, this dataset
Co-filing structure
Strongest pair: 6 joint filings
top co-assignee pairing
Joint filings cluster around a handful of corporate-affiliate pairs
The strongest co-assignee relationships in the dataset link a resin manufacturer with a regional operating affiliate or a corporate successor entity, rather than cross-industry partners. That pattern suggests most apparent 'collaboration' in this field reflects group structure, not open licensing or joint R&D with outside parties.
Source: co-assignee pair counts, this dataset
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Rohm and Haas Company | 0 | — |
| Organo Corporation | 0 | -100% |
| Dow Chemical Company | 0 | — |
| Wandong Gaoke (Tianchang) Co., Ltd. | 0 | — |
| Mitsubishi Chemical Corporation | 0 | — |
| Miura Co., Ltd. | 0 | — |
| Kurita Water Industries Ltd. | 0 | — |
| Panasonic Intellectual Property Management Co., Ltd. | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Ion Exchange Resins covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The filing and citation data point to a mature, densely claimed core with a few thinner branches still open. The next steps depend on whether the goal is freedom-to-operate, a new filing, or tracking a specific competitor.
Check freedom-to-operate against the densest claims
Before drafting new resin-composition claims, map the most-cited prior art in this corpus against your intended composition and process steps, especially anything touching weak-acid cation exchange chemistry or regeneration methods.
Run a freedom-to-operate check in EurekaExplore the thinner IPC bands before filing
Metal-extraction and analytical-testing overlaps carry a fraction of the filing volume of the B01J core, which may mean genuine open space or simply less commercial interest — worth a targeted search either way.
Search white space in EurekaTrack incumbents whose filing has gone quiet
Several long-standing assignees show zero filings in the latest year. That can signal a completed portfolio, a shift to trade secret, or an upcoming refresh — monitoring is the only way to tell which.
Set up assignee monitoring in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Ion Exchange Resins covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions about ion exchange resin patents
The ranking in this dataset is led by established resin and water-treatment manufacturers with long-running portfolios, including groups built around Rohm and Haas, Dow, Mitsubishi Chemical, Organo Corporation and Kurita Water Industries, among others. These names appear repeatedly across both the assignee ranking and the co-filing pairs, which points to concentrated, long-term investment rather than recent entry. However, recent-year momentum across these same incumbents has dropped to zero, so historical leadership does not necessarily mean current filing activity.
No, not on the filing-volume evidence here. Filings rose from 42 families in 2017 to a peak of 79 in 2021, then declined through a 2022 midpoint of 38 toward a much lower, partial count in the latest year. Because publication typically lags filing by around eighteen months, the most recent year understates true activity, but even accounting for that lag the trend since 2021 is downward or flat rather than growing.
The clearest opening is in the IPC subclasses that appear far less often than the dominant B01J core, notably metal extraction and refining (C22B) and material analysis and testing (G01N), each under 160 records against 2,336 for B01J. Specific process claims around regeneration cycles, osmotic shock resistance and crosslink density control also show as narrower, less crowded threads within the wider search. A thin subclass does not guarantee an easy grant, but it does mean fewer competing claims to design around.
That filing describes a method for converting a swollen-form weak acid cation exchange resin to an unswollen form via steam cleaning, along with downstream products such as potable water purification systems and disposable cartridges built on the resulting resin. It is a process claim tied specifically to that conversion and cleaning sequence, not a blanket claim over weak-acid cation exchange resin generally. Anyone filing in this space should check their process against this specific conversion-and-cleaning sequence rather than assuming the whole weak-acid resin category is closed off.
Based on receiving-office volume in this dataset, Japan and the United States carry the most filings, at 520 and 459 respectively, with the EPO close behind at 367 and China at 224. Canada and WIPO/PCT filings add smaller but non-trivial volume. A thorough clearance search for this field should cover at least these four leading offices rather than concentrating on a single jurisdiction.
Answers are grounded in the same dataset. Derived from a Patsnap search on Ion Exchange Resins covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Research Ion Exchange Resins in depth with Eureka
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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.