Solid Oxide Electrolyzer Reliability Patents: Leaders & Gaps 2026
- A niche, ceramics-heavy field. just 19 families sit at the intersection of SOEC electrolysis claims and degradation/thermal-cycling/delamination language — small enough that a handful of filers set the terms.
- Filing has already peaked and cooled. activity crested at 5 families in 2023 and had fallen back to 1 by the 2022 midpoint, so this is not a market still accelerating into the claim space.
- Two co-filing teams anchor the prior art. the strongest co-assignee pairing recurs three times, and the same three names show up across every strong pairing — a tight inventor cluster worth checking before drafting around it.
Filing growth compares 2021 (2 records) with 2024 (2) — 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.
A small, ceramics-adjacent corner of the electrolyzer patent map
Solid oxide electrolysis cells (SOECs) fail mostly at interfaces: electrode delamination under thermal cycling, seal glass cracking, and interconnect degradation over thousands of hours at 700–850°C. This landscape isolates the patent families that explicitly claim degradation mitigation, thermal cycling durability, delamination resistance or long-term stability within SOEC and related fuel-cell electrolysis IPC classes. At 19 families, it is a narrow slice of the broader solid oxide fuel cell art, but a decision-relevant one: these are the claims that determine whether a stack design can be warrantied for years rather than months.
Filing offices skew European and American, with EPO and US receiving the bulk of records and only a thin trickle through WIPO, Australia and Japan. Publication lags filing by roughly 18 months, so any apparent slowdown in the most recent year should be read with that gap in mind rather than taken as a hard stop.
Filing trend and technology composition
The trend line and IPC spread show a field that never scaled up and stays anchored in fuel-cell and electrolytic-production classifications rather than spreading into adjacent materials science.
Flat-to-declining filing activity
Filings were at zero as recently as 2017, rose to a peak of 5 families in 2023, then dropped back to 1 at the 2022 midpoint measure — a pattern of a short filing wave rather than sustained build-out. Treat the newest year as undercounted given the usual 18-month publication lag.
Concentrated in H01M and C25B
Fourteen of 19 records sit in H01M (batteries, cells & fuel cells) and 13 in C25B (electrolytic production of compounds), confirming this is core electrochemical-cell art. Ceramics (C04B, 4 records) is the only meaningfully sized adjacent class; metal rolling, rare-earth compounds, glass/enamel and coatings each appear once or twice, marking them as exploratory rather than established filing territory.
Shares are the percentage of the 19 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Solid Oxide Electrolyzer Reliability and Durability with Eureka
This page is one run against one query. Ask Eureka your own question about solid oxide electrolyzer reliability and durability and every answer comes back with the patent numbers behind it.
Try EurekaThe documents anchoring this claim space
Solid Oxide Electrolysis Cell, Method for Manufacturing Solid Oxide Electrolysis Cell, Solid Oxide Electrolysis Module, Electrochemical Device, and Energy System
Provided is a solid oxide electrolysis cell in which the electrode layer thereof is prevented from peeling, and that has excellent strength (reliability), durability, and performance. A solid oxide electrolysis cell E includes at least: a first electrode layer; a second electrode layer; and an electrolyte layer disposed between the first electrode layer and the second electrode layer, wherein the first electrode layer has at least a plurality of pores each having an area of 0.75 μm² or more in a vertical cross section thereof.Filed by OSAKA GAS CO., LTD., published 2025-06-26 — the pore-size limitation is the operative claim element to check against.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20110062017A1 | Efficient reversible electrodes for solid oxide electrolyzer cells | 17 |
| 2 | US20230110742A1 | Metal Support, Electrochemical Element, Electrochemical Module, Electrochemical Device, Energy System, Solid … | 7 |
| 3 | US8354011B2 | Efficient reversible electrodes for solid oxide electrolyzer cells | 6 |
| 4 | JP2015532253A | 封止剤として使用するためのガラス組成物 | 4 |
Citation counts favour older filings simply because they have had longer to be cited; read them as a signal of influence on later drafting, not of current commercial relevance.
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 (4 of 4 rows); clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers say about this claim space
Three data points matter more than the raw family count when deciding where to file or design around: the composition split, the citation concentration, and the co-filing pattern.
Fuel-cell classification dominates
H01M and C25B together cover the great majority of records, meaning most inventive effort is being classified as core electrochemical-cell or electrolytic-production art rather than as materials or ceramics innovation, even though electrode/electrolyte interface failure is a materials problem.
Influence sits with two related US filings
The two most-cited records (US20110062017A1 and US8354011B2) share near-identical titles on reversible SOEC electrodes and together account for the bulk of citation weight in the set — a strong signal that reversible-electrode design is the reference point later filers draft against.
A tight three-person inventor cluster
Nine co-assignee pairs exist in total, but the three strongest all involve the same three names, appearing in every top pairing. That concentration suggests a single lab or spin-out lineage authored a disproportionate share of the durability-specific claims.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to solid oxide electrolyzer reliability and durability, with the prior art for and against each one.
Who is filing, and where the field is thinning out
Every tracked assignee shows zero filings in the latest year, consistent with the broader flat-to-declining trend rather than any single company's specific retreat. That makes recent-year momentum a weak differentiator here; family count and co-filing depth are more telling.
OSAKA GAS CO., LTD.
Holds the representative recent filing on electrode pore geometry aimed squarely at peel prevention, extending an established Japanese industrial-gas interest in SOEC durability into a specific pore-area claim.
ZHAO FENG / ELANGOVAN S / HARTVIGSEN JOSEPH J cluster
These three names anchor the strongest co-assignee pairings in the corpus, pointing to a shared lineage of reversible-electrode work that predates and underlies several of the most-cited records.
Ceramics-technology institutes
Organisations working in sealing glass and ceramic electrolyte composition — including entries tied to glass-seal chemistry — occupy a smaller but distinct slice of the corpus, separate from the electrode-focused majority.
| Assignee | Recent year | YoY |
|---|---|---|
| Osaka Gas Co., Ltd. | 0 | — |
| CeraMatec, Inc. | 0 | — |
| ZHAO FENG | 0 | — |
| ELANGOVAN S | 0 | — |
| HARTVIGSEN JOSEPH J | 0 | — |
| Korea Institute of Energy Research (KIER) | 0 | — |
| Phillips 66 Company | 0 | — |
| Georgia Tech Research Corporation | 0 | — |
Where to take this analysis
The family count here is small enough to review individually rather than only statistically, and the claim boundaries around electrode peeling and seal-glass composition are worth mapping before committing R&D spend.
Map the reversible-electrode citation cluster
Trace forward and backward citations from the two most-cited US records to see which later filings, including outside this narrow IPC search, build directly on reversible-electrode claims.
Explore in Eureka →Check the pore-geometry claim boundary
Compare the 0.75 μm² pore-area limitation in the 2025 Osaka Gas filing against your own electrode microstructure specifications before finalising a design.
Explore in Eureka →Watch for the next filing wave
Given the 18-month publication lag, filings from 2024–2025 are still arriving; recheck this set in six months before concluding the field has permanently cooled.
Explore in Eureka →Frequently asked questions
The dominant failure modes are electrode delamination from the electrolyte under repeated thermal cycling, seal-glass cracking at the interconnect, and chromium or nickel migration across cell interfaces during long-duration operation. These mechanisms are driven by the mismatch in thermal expansion between ceramic and metallic components at operating temperatures of 700–850°C. Patent filings in this space concentrate on electrode pore architecture, sealing glass composition and interconnect coatings as the levers used to address them.
Citation weight in this corpus concentrates on two closely related US filings covering reversible SOEC electrodes, alongside a tight cluster of three named co-assignees who recur across the strongest co-filing pairs. A more recent filing from Osaka Gas claims a specific electrode pore-area threshold aimed directly at preventing peeling. Anyone drafting in this area should review both the older reversible-electrode lineage and the newer pore-geometry claim before finalising a design.
Based on the tracked filings, activity peaked at 5 families in 2023 and had fallen back to a single family by the 2022 midpoint measure, indicating a short filing wave rather than sustained growth. Because publication typically lags filing by around 18 months, the most recent year in any such dataset will understate true activity, so this should not be read as a definitive end to filing. Still, the pattern across the visible years is flat to declining rather than accelerating.
Glass-ceramic seal composition tuning, interconnect diffusion-barrier coatings, reversible-mode redox cycling protocols, metal-support pore architecture and rare-earth doped electrolyte stability all show thin direct coverage relative to the electrode-delamination claims that dominate the corpus. These branches sit adjacent to the most-cited records without being claimed as specifically. A first claim in one of these areas would need to specify a measurable structural or compositional parameter, similar to the pore-area limitation used in the 2025 Osaka Gas filing, rather than a broad functional description of durability.
The search string combines a narrow electrolysis technology (SOEC) with specific durability language (degradation mitigation, thermal cycling, delamination resistance, long-term stability) and a targeted set of IPC classes, which naturally narrows the result set to 19 families. Broader SOEC or solid oxide fuel cell searches without the durability-language filter would return substantially more records. The small count here reflects the specificity of the query, not necessarily the total inventive activity in SOEC durability engineering.
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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.