AEM Electrolyzer Patents: Who Leads, Where the Gaps Are 2026
- 21 families total. this is a young, thin corpus — most activity has landed since 2022, with 2025 alone accounting for 9 of the filings.
- China dominates filing location. 10 of the tracked receiving-office filings are Chinese, versus 4 PCT, 2 each in Israel and India, and single filings in Europe and South Korea.
- No single assignee has repeat depth. the only co-filing pair on record is two Chinese state-energy entities filing together twice — every other assignee shows flat or negative year-on-year momentum.
A narrow, IPC-concentrated corpus still forming its centre of gravity
Anion exchange membrane (AEM) electrolyzer patenting sits almost entirely inside C25B — electrolytic production of compounds — with all 21 tracked families touching that subclass. Adjacent IPC codes appear only once or a handful of times: catalysis (B01J, 3 records), polymer processing (C08J), coating (C23C), fuel cells (H01M) and grid power (H02J) each show up as single-digit outliers rather than established sub-tracks. That concentration means the core cell architecture — membrane, electrode assembly, catalyst layer — is where nearly every filer is putting claims, while balance-of-system and integration claims remain largely untouched.
The filing curve is flat through the late 2010s, sits at a single family in 2022, and only becomes active from 2023 onward, peaking at 9 families in 2025. Because publication typically lags filing by around 18 months, the 2026 count understates true recent activity and should be read as incomplete rather than declining.
Filing trend and technology composition
Two views of the same 21-family dataset: how filing activity has moved year over year, and where those filings sit across the IPC classification system.
A late, concentrated filing wave
Activity is essentially absent before 2022, rises sharply from 2023, and peaks at 9 families in 2025 — the 2026 figure is a partial year and will revise upward as publications catch up to filings.
Everything routes through electrolytic production
All 21 families sit in C25B; catalysis, polymer, coating, fuel-cell and power-grid classifications each appear only marginally, showing the field has not yet branched into well-populated adjacent claim areas.
Shares are the percentage of the 21 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaWhat the most-cited and most recent filings claim
High surface area anode catalyst for AEM electrolyzers (US20250369133A1)
The filing, from HET Hydrogen Pte. Ltd. and published December 2025, discloses a catalyst layer built on meso-porous particles with open pores that give a less-conductive catalyst a high-surface-area, conductive support — either grown directly on the particles or admixed and adsorbed onto them. The AEM electrolyzer structure pairs this anode-side meso-porous catalyst layer with a cathode side built from a bipolar or half plate, a porous transport layer and its own catalyst layer.Filed by HET Hydrogen Pte. Ltd., published 2025-12-04.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN120330748A | 一种AEM电解水制氢用阳极气体扩散层、制备方法及应用 | 1 |
| 2 | CN221094299U | 一种AEM电解水制氢用膜电极 | 1 |
Citation counts in this corpus are low (1 citation on the top records) and skew toward older filings — treat them as weak influence signals in a field this young, not as a maturity indicator.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Publication numbers are shown where the record carries one (2 of 2 rows); clicking a row searches Eureka by that number.
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Three read-throughs from the trend, geography and citation data that matter more than any single ranking.
Activity is recent and still accelerating on paper
The jump from a flat baseline (1 family as late as 2022) to 9 families in 2025 signals a field that only recently became patentable subject matter of interest, likely tracking commercial AEM electrolyzer pilots. The 2026 count is partial and will grow as pending publications clear the roughly 18-month lag.
China is the dominant filing venue, but not exclusively
Chinese-office filings outnumber PCT filings more than two to one, with smaller counts through Israel, India, Europe and South Korea. A single-market filing strategy dominated by China but paired with selective PCT and EPO coverage suggests filers are still testing which markets matter commercially.
Citation signal is too thin to indicate influence yet
The most-cited records in this corpus carry a single citation each. In a corpus this small and this recent, citation counts say almost nothing about technical importance — they mainly reflect which records happened to publish earliest.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to anion exchange membrane electrolyzer alkaline electrolyzer, with the prior art for and against each one.
A field without an entrenched leader
No assignee in this dataset shows sustained multi-year filing momentum. The one co-filing relationship on record and a set of assignees now filing at zero suggest the competitive map is still being drawn rather than settled.
State-energy R&D pairing is the sole collaboration signal
The strongest — and only — co-assignee pair links a Chinese coal-power operating company with its group's clean-energy technology research institute, filing together twice. No other cross-assignee collaboration appears in the tracked families.
Every named assignee has gone quiet in the most recent year
Assignees including university, industrial and state-energy filers all show zero output in the latest tracked year, several down 100% year-on-year from a prior filing. This is consistent with publication lag rather than a genuine pullback, but it means no filer currently shows visible sustained momentum.
A long tail of single- or low-filing entrants
The assignee base spans universities, a specialty chemicals group, Asian battery and energy majors, and Chinese state-energy entities, with no single organisation building a deep portfolio. That is typical of a technology area still attracting first-time entrants rather than being defended by an incumbent.
| Assignee | Recent year | YoY |
|---|---|---|
| University of Delaware | 0 | — |
| Lubrizol Corporation | 0 | — |
| New Mobility Power Systems Co., Ltd. | 0 | -100% |
| Huizhou EVE Hydrogen Energy Co., Ltd. | 0 | -100% |
| Huaneng Yimin Coal & Power Co., Ltd. | 0 | -100% |
| China Huaneng Clean Energy Technology Research Institute Co., Ltd. | 0 | -100% |
| Hanwha Solutions Corporation | 0 | — |
| Arkema | 0 | — |
Where to take this analysis
This landscape flags the pattern; the next step is testing a specific claim or freedom-to-operate question against the full family set.
Check a draft claim against this corpus
Run a specific membrane, catalyst-layer or MEA claim through the full family set to see which of the 21 records sit closest before drafting further.
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Set an alert on the assignees in this dataset so a resumed filing pattern after the current zero-momentum year surfaces early.
Set up monitoring in Patsnap EurekaCommon questions on AEM electrolyzer patents
This dataset tracks 21 patent families published between 2015 and mid-2026 that match AEM electrolyzer-specific search terms across title, claims and IPC codes C25B13/08, C25B9/23 and C08J5/22. That is a small corpus by patent-landscape standards, reflecting that AEM electrolyzer technology is a relatively recent commercial focus compared with established alkaline or PEM electrolysis. Because publication lags filing by roughly 18 months, the true number of filed-but-unpublished applications is likely somewhat higher, particularly for 2025-2026.
No single assignee shows sustained multi-year dominance in this corpus; filings are spread across universities, specialty chemical firms, Asian battery and energy companies, and Chinese state-energy research entities. The only recorded collaboration is a Chinese coal-power operator filing jointly with its group's clean-energy research institute, on two occasions. Every tracked assignee shows zero filings in the most recent year, which likely reflects publication lag rather than an actual pullback in R&D.
China is the dominant receiving office, accounting for 10 of the tracked filings, followed by the WIPO PCT route with 4. Smaller counts appear via Israel and India (2 each) and single filings through the European Patent Office and South Korea. This geographic pattern suggests most filers are currently prioritising the Chinese domestic market, with PCT filings used selectively to preserve broader options rather than committing early to specific foreign markets like the US or Europe.
Almost all 21 families sit inside IPC class C25B (electrolytic production of compounds), with only marginal activity in catalysis, polymer processing, coatings, fuel cells or power-grid integration. That concentration means claim space around bipolar plate and flow-field design, porous transport layer coatings, balance-of-plant integration, and long-term ionomer durability remains comparatively open. A filer targeting these adjacent branches would face less prior art than one filing directly on core membrane or catalyst-layer composition claims.
Filing activity was essentially flat through the late 2010s, with only a single tracked family as of 2022, before rising sharply to a peak of 9 families in 2025. The 2026 figure appears low but is a partial-year count subject to the usual 18-month publication lag, so it should not be read as a decline. Taken together, the trend indicates a field that has only recently become an active patenting focus rather than one that is maturing or slowing.
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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.