Alkaline Electrolyzer Bipolar Plate Patents: Leaders & Gaps 2026
- Filing peaked in 2023 at 14 families, then eased back — this is a claim space that has already been worked hard rather than one still accelerating.
- China leads receiving offices with 15 filings, ahead of Europe (11) and the US (9), so freedom-to-operate checks need to start with CNIPC prior art.
- Only two co-assignee pairs exist across 45 families, meaning most of this technology is being claimed by single owners rather than through joint development.
What this landscape covers
This landscape tracks patent families combining alkaline water electrolysis (AWE) with bipolar plate, flow field plate, or plate coating claims, filtered to IPC classes covering electrolytic production and related electrode structures. It captures 45 published families filed or published between 2015 and the 2026 data cut-off, with publication lag meaning the most recent one to two years are undercounted. The scope centres on C25B9/23, C25B11, and C25B9/60 — the classification core for electrolyzer cell hardware rather than catalyst chemistry or system-level balance-of-plant claims.
Bipolar plates sit at the mechanical and electrochemical centre of an alkaline electrolyzer stack: they carry current, separate gas streams, and resist corrosion in concentrated caustic. Patent activity here tracks materials selection, coating processes, and flow-channel geometry rather than the membrane or catalyst layers covered elsewhere in the electrolyzer stack.
Filing trend and technology composition
Two views of the same 45-family dataset: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend, 2017–2026
Filings rose from zero in 2017 to a peak of 14 in 2023, with the 2022 midpoint at 7 — a doubling in a single year followed by a flattening. The partial 2026 count reflects publication lag rather than a real drop-off in filing intent.
IPC subclass composition
All 45 records classify under C25B, the electrolytic-production core, with small overflow into alloy (C22C), heat treatment (C21D), electroplating (C25D), and surface coating (C23C) classes — evidence that most inventive effort is being claimed as electrolyzer-specific hardware rather than routed through generic materials-science filings.
Go deeper on Alkaline Electrolyzer Bipolar Plate with Eureka
This page is one run against one query. Ask Eureka your own question about alkaline electrolyzer bipolar plate and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative recent filing
EP4729659A1 — Bipolarplatte, Endplatte und Alkali-Elektrolyseur
The application places first and second alkali liquor inlet through-hole groups at the bottom of the electrode frame, so alkali liquor entering one end of the electrolyzer follows defined first and second inlet channels before reaching the far end — a specific channel-routing geometry for liquor distribution across the bipolar plate.Abstract condensed from the published filing; full claim language should be reviewed before drawing design-around conclusions.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2022243441A1 | A method for producing electrodes for electrolysis | 5 |
| 2 | CN118166377A | 一种碱水电解制氢电解槽及气液传输层 | 4 |
| 3 | CN116497382A | 双极板、电解单元和电解槽 | 3 |
| 4 | CN117070996A | 电解槽复合隔膜、碱性电解水制氢装置及方法 | 2 |
| 5 | EP3460100A1 | Alkaline water electrolysis device and operation method thereof | 2 |
| 6 | WO2025045025A1 | 双极板、端板和碱性电解槽 | 1 |
| 7 | CN118932370A | 一种碱性水电解双极板、电解单元、电解槽及制氢系统 | 1 |
| 8 | KR102727497B1 | Electrolyzer with improved flow path structure | 1 |
| 9 | CN221797682U | 一种用于碱性水电解制氢的双极板及碱性电解槽 | 1 |
| 10 | CN221094303U | 一种具有乳突结构的碱性电解槽双极板 | 1 |
Citation counts favour older filings simply by virtue of having had more time to accumulate references; treat this as a map of documented influence, not of what matters most today.
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. Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-outs from the filing trend, geography, and citation data that matter for anyone deciding where to file or who to watch.
Growth has flattened, not accelerated
Filings rose from zero in 2017 to a 2023 peak of 14, doubling from the 2022 midpoint of 7 in a single year. There is no clear post-peak acceleration in the data available, and the partial 2026 count is expected given publication lag.
China leads, but the field is genuinely international
China's 15 filings lead the receiving-office count, with Europe at 11, the US at 9, WIPO PCT filings at 7, and South Korea at 3. That spread means a freedom-to-operate review confined to one jurisdiction will miss real claim coverage.
Claims are held individually, not jointly
Only two co-assignee pairings appear across the full 45-family set, one linking a Japanese university to an electric-wire manufacturer and one linking two Chinese state-energy entities. Most other families are filed by a single owner, suggesting limited cross-licensing activity to date.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to alkaline electrolyzer bipolar plate, with the prior art for and against each one.
Who is filing, and where the gate sits
The assignee base is fragmented: no single owner shows sustained momentum into the latest year, and recent-year filing counts across tracked assignees sit at zero, consistent with the broader publication-lag effect on 2025–2026 data.
No visible current-year leader
Every assignee tracked for recent-year momentum shows zero filings in the latest year, which is expected given the 18-month publication lag rather than evidence that filing has stopped. Momentum should be re-checked once 2025–2026 filings finish publishing.
One academic-industrial pairing stands out
A Japanese national university and a Sumitomo electric-wire manufacturer co-assign five families together, the single strongest collaboration link in the dataset. No other pairing approaches that depth.
Chinese state-energy entities file jointly on a smaller scale
A PetroChina-affiliated research institute and PetroChina itself co-assign two families, pointing to internal R&D-to-parent filing patterns rather than open industry collaboration.
| Assignee | Recent year | YoY |
|---|---|---|
| Yokohama National University | 0 | — |
| Sumitomo Electric Industries, Ltd. | 0 | — |
| Zhiqing Hydrogen Co., Ltd. | 0 | — |
| Doosan Corporation | 0 | — |
| Hydotech Hydrogen Energy Technology (Jiangsu) Co., Ltd. | 0 | — |
| POSCO Holdings Inc. | 0 | — |
| Huashang Xiageng Hydrogen Energy Technology (Xiamen) Co., Ltd. | 0 | — |
| PetroChina Shenzhen New Energy Research Institute Co., Ltd. | 0 | — |
Where to take this analysis
The filing trend and assignee map point to specific next checks before committing R&D or filing budget to this space.
Confirm freedom-to-operate against Chinese filings first
With 15 of 45 families filed through China's receiving office, a design-around search that starts in the US or EPO alone will miss the largest single bloc of claims.
Run a freedom-to-operate searchWatch for the 2025–2026 filing correction
Every assignee shows zero latest-year filings, an artefact of publication lag rather than a real slowdown; revisit assignee rankings once this window finishes publishing.
Track filing updatesLook past the C25B core for adjacent claim opportunities
Coating, alloy, and powder-metallurgy classes carry only one or two filings each, leaving room for claims that pair plate geometry with a specific fabrication or surface-treatment method.
Explore white spaceCommon questions about this landscape
This landscape identifies 45 patent families published between 2015 and the 2026 data cut-off that combine alkaline water electrolysis claims with bipolar plate, flow field plate, or plate coating terminology under the relevant C25B classification. That is a relatively small, specialised corpus compared to broader hydrogen-electrolyzer patenting overall. Because publication lags filing by roughly 18 months, the true 2025–2026 filing count will run higher than currently shown once those applications publish.
China leads by receiving office with 15 filings, ahead of the European Patent Office at 11 and the United States at 9. WIPO PCT filings account for 7 and South Korea for 3. This distribution means a thorough prior-art or freedom-to-operate review needs to cover Chinese-language filings directly rather than relying on English-language databases alone.
Filing rose from zero in 2017 to a peak of 14 families in 2023, roughly doubling from the 2022 midpoint of 7, but there is no clear evidence of continued acceleration beyond that peak in the data available. The apparent decline into 2025 and 2026 is partly an artefact of publication lag, since recent applications have not all published yet. Treat 2023 as the high-water mark for now and re-check the trend once later years finish publishing.
The assignee base is fragmented rather than dominated by one or two large players, with the strongest documented collaboration being five shared families between a Japanese national university and a Sumitomo electric-wire manufacturer. A second, smaller collaboration links two Chinese state-energy entities on two shared families. Beyond these pairs, most families in this dataset are filed by single owners, suggesting the field has not yet consolidated around a handful of dominant IP holders.
IPC overflow outside the core C25B electrolytic-production classification is thin: coating and surface-deposition claims (C23C), powder-metallurgy fabrication (B22F), electroplating (C25D), heat treatment (C21D), and catalytic surface treatment (B01J) each carry only one or two filings in this dataset. That sparsity suggests fabrication-method and surface-treatment claims paired with specific plate geometries remain comparatively open, though light filing density does not by itself guarantee an easy grant — it means the claim space is less occupied, not that it is technically simple.
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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.