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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/proton-exchange-membrane-electrolyzers-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Water ElectrolysisProton Exchange Membrane Electrolyzer Patents: Who Files, What They Claim
- 934 records, 15.3% of the field. the five most active filers combined hold this share of all 6,085 records in scope — concentrated but not dominant.
- +77% filing growth. annual filings rose from 283 in 2021 to 501 in 2024, the last year with reliable, near-complete counts.
- 64.9% sit in H01M, only 36.7% in C25B. most filings still frame the electrolyzer as a fuel-cell-adjacent battery/cell structure rather than an electrolytic production process.
6,085
Published Records
15%
Top-5 Share of All Records
+77%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (283 records) with 2024 (501) — 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 6,085 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This landscape tracks 6,085 patent records published between 2015 and mid-2026 that combine proton exchange membrane or membrane electrode assembly claims with specific degradation and transport-layer terms: iridium loading, porous transport layer design, membrane thinning, hydrogen crossover, differential pressure and catalyst degradation. The search string deliberately excludes generic PEM fuel cell filings that do not touch these operating-condition or materials terms, so the set skews toward electrolyzer durability and performance engineering rather than stack assembly in general.
Filing activity has grown substantially since 2021, and the assignee base spans automakers, industrial gas and hydrogen equipment companies, and specialty materials suppliers. The mix of IPC classes below shows a field still described mostly through fuel-cell-style claim language, with electrolytic-production framing a secondary but sizeable share.
Filing volume and technology composition, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Proton Exchange Membrane Electrolyzers 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
The Data
Filing trend and technology composition
Publication lags filing by roughly 18 months, so counts for 2025 and 2026 will keep rising as records publish; treat the tail of the trend as incomplete rather than as a slowdown.
Filings climbed through 2023 before the recent-year lag sets in
Annual filings rose from 193 in 2017 to a peak of 679 in 2023. The 2021-to-2024 span alone shows growth from 283 to 501 records, a +77% increase over three years — the clearest complete-year comparison the data supports. Counts for 2025 and 2026 are still filling in and should not be read as a decline.
Claims still cluster in fuel-cell-style classification
H01M (batteries, cells and fuel cells) appears on 64.9% of the 6,085 records in scope, more than the 36.7% carrying C25B (electrolytic production of compounds). Smaller but consistent shares sit in separation processes (B01D, 6.3%), catalysis (B01J, 5.9%), inorganic compounds (C01B, 5.9%) and polymer processing and composition classes (C08J, C08G, C08L, each under 6%). Because records can carry multiple classes, these figures sum to more than 100% of the record total.
Shares are the percentage of the 6,085 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 Proton Exchange Membrane Electrolyzers covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Representative filing and citation leaders
Representative Record
Unified assembly for electrochemical device (US20250236965A1)
HYAXIOM, INC.
The filing describes a membrane electrode assembly where cathode and anode catalyst layers extend to the outermost peripheral edge of the proton exchange membrane, with a thermoplastic film impregnated into the outer edges of the gas diffusion layer and porous transport layer to seal the assembly. The structure targets edge failure modes common in PEM electrolyzer stacks.Filed by Hyaxiom, Inc.; published 2025-07-24.
Most-cited records in this search
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6542076B1 | Control, monitoring and/or security apparatus and method | 581 |
| 2 | US6542077B2 | Monitoring apparatus for a vehicle and/or a premises | 509 |
| 3 | US7277010B2 | Monitoring apparatus and method | 392 |
| 4 | US6587046B2 | Monitoring apparatus and method | 372 |
| 5 | US20140113828A1 | Electrical, mechanical, computing/ and/or other devices formed of extremely low resistance materials | 350 |
| 6 | US7397363B2 | Control and/or monitoring apparatus and method | 318 |
| 7 | US5464700A | Gasketed membrane electrode assembly for electrochemical fuel cells | 291 |
| 8 | US20050248444A1 | Control, monitoring, and/or security apparatus and method | 257 |
| 9 | US6641625B1 | Integrated hydrocarbon reforming system and controls | 250 |
| 10 | US20030206102A1 | Control, monitoring and/or security apparatus and method | 247 |
Citation counts favour older filings simply by virtue of having had more time to accumulate them; use them as a signal of influence within this corpus, not of current technical importance.
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 Proton Exchange Membrane Electrolyzers 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 numbers say about where the field stands
Three patterns stand out once filing counts, classification and concentration are read together.
Concentration
15.3%
top 5 share of all records
Leadership is real but not a lock
The five most active assignees together account for 15.3% of the 6,085 records in scope, and the ranked ten reach 27.5%. That leaves the large majority of filings spread across a long tail of automakers, equipment makers and materials suppliers — no single company has cornered the durability and transport-layer claim space.
Based on the 100-company ranking returned for this search.
Growth
+77%
filings, 2021 to 2024
Activity accelerated sharply mid-decade
Filings rose from 283 in 2021 to 501 in 2024, and the field's peak year so far is 2023 at 679 records. That trajectory reflects growing commercial interest in PEM electrolyzer durability engineering, not just publication noise.
2025–2026 counts are still incomplete due to publication lag.
Classification
64.9% vs 36.7%
H01M share vs C25B share
Claim framing still leans toward fuel cells
Nearly two-thirds of records classify under H01M (fuel cells and batteries) against just over a third under C25B (electrolytic production). Filers writing claims around electrolytic-process framing specifically, rather than stack-component framing, sit in a comparatively less crowded classification lane.
Shares sum to more than 100% because records carry multiple IPC classes.
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 proton exchange membrane electrolyzers, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Proton Exchange Membrane Electrolyzers 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 is filing, and where the gaps sit
Automakers and fuel-cell specialists dominate the ranked leaders, but recent-year momentum has cooled sharply for several of the largest historical filers, and specific sub-areas remain thinly claimed.
Leader
203 records
top-ranked assignee
A single filer leads by a clear margin
The top-ranked assignee holds 203 records, ahead of 177 for the fifth-placed and 141 for the tenth-placed filer. The gap between first and fifth place is real but not overwhelming, consistent with a field where leadership can still shift.
Ranking covers 100 assignees, counted by record.
Momentum
-100% YoY
several major filers, latest year
Historic leaders have gone quiet recently
Several of the largest historical assignees, including major automakers, show zero filings in the latest tracked year, with year-on-year drops as steep as -100% for some. This may reflect publication lag as much as any real pullback, but it means recent-year rankings should not be read as the current pecking order.
Recent-year counts are the most exposed to the 18-month publication lag.
Collaboration
10 pairs
co-assignee relationships
Co-filing is limited and concentrated
Only ten co-assignee pairs appear in the dataset, and the strongest of them is far more active than the rest. Most filers in this field patent independently rather than through joint development structures.
Strongest pair filed well ahead of the next-strongest co-filing relationship.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Johnson Matthey Hydrogen Technologies | 3 | -88% |
| Nuvera Fuel Cells LLC | 0 | — |
| Honda Motor Co., Ltd. | 0 | -100% |
| 3M Innovative Properties Co. | 0 | — |
| Nissan Motor Co., Ltd. | 0 | — |
| GM Global Technology Operations LLC | 0 | -100% |
| Robert Bosch GmbH | 0 | -100% |
| Hyundai Motor Co., Ltd. | 0 | -100% |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Proton Exchange Membrane Electrolyzers 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 next
The dataset points to specific follow-up questions rather than a single conclusion.
Check freedom-to-operate in the under-claimed chips
The sub-areas with thin filing counts above are worth a targeted prior-art search before committing engineering resources, since low density here has not been tested against a rigorous claim-scope review.
Explore in EurekaWatch whether 2025–2026 filings confirm the cooldown
Several large historical filers show sharp drops in the latest year; whether that is real strategic pullback or simply publication lag will only be clear once 2025 filings finish publishing.
Track filing trends in EurekaRe-run the classification split by applicant type
The H01M-versus-C25B split suggests two different claim-drafting traditions in this field; segmenting it by automaker versus industrial-gas versus specialty-materials filer would clarify who is driving which framing.
Segment assignees in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Proton Exchange Membrane Electrolyzers 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 PEM electrolyzer patents
The ranked leader in this dataset holds 203 of the 6,085 records in scope, with the fifth-placed assignee at 177 and the tenth at 141. The field is led by automakers and fuel-cell/hydrogen equipment specialists, but the top five combined only reach 15.3% of all records, so no single company controls the claim space. A full picture requires checking both the leader's portfolio and the long tail of single- and double-digit filers working on specific sub-components.
Yes, through the last complete year of data. Filings rose from 283 in 2021 to 501 in 2024, a +77% increase, with a peak year so far of 679 filings in 2023. Counts for 2025 and 2026 appear lower only because patent publication lags filing by roughly 18 months, so those years are still filling in and should not be read as a slowdown.
H01M covers batteries, cells and fuel cells, and it is the class carried by 64.9% of the 6,085 records in this search, reflecting a tendency to draft PEM electrolyzer claims using fuel-cell-style structural language. C25B covers electrolytic production of compounds and appears on 36.7% of records, closer to how a process-chemistry filing would frame the same technology. Because records can carry both, comparing the two shares shows a drafting-convention split rather than two mutually exclusive technology camps.
Sub-areas such as porous transport layer coatings for corrosion resistance, differential-pressure sealing at membrane edges, and hydrogen crossover mitigation at low current density carry noticeably fewer filings than the dense H01M and C25B clusters. That does not guarantee an easy filing path, since general prior art may still apply, but it does mean fewer competing claims to design around directly. Any filing strategy here should still start with a targeted freedom-to-operate search rather than relying on filing counts alone.
Several large historical assignees, including well-known automakers, show zero or near-zero filings in the latest tracked year, with year-on-year drops as steep as -100% for some. Part of this is a real signal, but part is an artefact of the roughly 18-month gap between filing and publication, which understates the most recent one to two years for every filer. The safer read is to treat rankings from 2024 and earlier as reliable and to wait before concluding any company has exited the space.
Answers are grounded in the same dataset. Derived from a Patsnap search on Proton Exchange Membrane Electrolyzers 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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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.