PEM Electrolyzer Patents: Top Companies & Filing Trends 2026
Proton 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. 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.
- 1HONDA MOTOR CO LTD3.3%
- 2NISSAN MOTOR CO LTD3.2%
- 3GM GLOBAL TECHNOLOGY OPERATIONS LLC3.0%
- 4NUVERA FUEL CELLS LLC2.9%
- 53M INNOVATIVE PROPERTIES CO2.9%
See the full proton exchange membrane electrolyzers analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about PEM electrolyzer patents
Who holds the most patents on PEM electrolyzers?
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.
Is PEM electrolyzer patent filing still growing?
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.
What is the difference between H01M and C25B classification in this field?
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.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: 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. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.