Solid Oxide Electrolyzer Patents: Leaders & Efficiency Trends 2026
- Filing peaked in 2022 at 21 families and has not returned to that level since, suggesting the core claim space around overpotential reduction and thermoneutral operation is being consolidated rather than expanded.
- The United States dominates as receiving office with 17 filings versus 8 at WIPO and 7 at the EPO, so US prosecution history is the most reliable prior-art signal for this technology.
- Co-assignment is rare only 3 co-assignee pairs exist across 49 families, pointing to mostly single-institution R&D rather than joint ventures or cross-licensing consortia.
What this landscape covers
This dataset tracks 49 patent families filed between 2015 and 2026 that combine solid oxide electrolyzer or solid oxide electrolysis cell (SOEC) terminology with efficiency-specific language: electrical efficiency, thermoneutral operation, overpotential reduction and efficiency enhancement, restricted to the electrolytic-production IPC classes C25B1/04, C25B11 and C25B15. It is a narrow, efficiency-focused slice of the broader SOEC field rather than a count of every hydrogen-electrolyzer filing.
Because publication typically lags filing by around 18 months, the most recent one or two years in any trend line will look thinner than they eventually turn out to be. The 2022 peak and the subsequent flattening should be read with that lag in mind rather than as a definitive slowdown.
Filing trends and technology composition
Two views of the same 49-family dataset: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
A peak in 2022, then a plateau
Filings rose from 8 in 2017 to a peak of 21 in 2022, then eased off. With 2022 as the midpoint of the observed range, growth in the back half of the window is flat or declining rather than accelerating — a pattern consistent with a maturing claim space rather than a newly opened one.
Concentrated in electrolytic production, spilling into fuel cells
All 49 records sit in C25B (electrolytic production of compounds), as expected given the search scope. A substantial secondary cluster of 21 falls in H01M (batteries, cells and fuel cells), reflecting the shared hardware lineage between SOEC and solid oxide fuel cell (SOFC) stacks. Smaller counts in B01D, C01C and C10G mark peripheral filings touching separation, ammonia synthesis and hydrocarbon processing — these are adjacent-application signals, not core efficiency claims.
Shares are the percentage of the 49 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 Efficiency Enhancement with Eureka
This page is one run against one query. Ask Eureka your own question about solid oxide electrolyzer efficiency enhancement and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited and most-recent filings
US20250305156A1 — Microwave-assisted and reversible proton-conducting SOEC/H-SOEC/rSOEC designs for hydrogen production
A method of enhancing an electrolysis reaction in a solid oxide electrolysis cell (SOEC) for hydrogen production featuring: providing a water vapor stream to a cathode chamber of a SOEC; wherein the SOEC has an cathode chamber and an anode chamber, wherein the cathode chamber contains a catalyst; and wherein the catalyst has one or more conducting oxides and one or more catalytically active materials dispersed within the conducting oxides; and applying an electromagnetic field to the SOEC with a prescribed frequency and pulse mode specific to interactions of the catalyst and the electromagnetic field with the SOEC; and applying a DC bias to the SOEC, resulting in production of some amount of hydrogen.Filed by the United States Department of Energy, published 2025-10-02 — one of the most recent entrants in this dataset and notable for combining microwave assistance with proton-conducting and reversible cell architectures in a single claim family.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20190245224A1 | System for high-temperature reversible electrolysis of water comprising a hydride tank coupled with the elect… | 85 |
| 2 | WO2018080571A1 | Solid oxide electrolysis with internal heater | 15 |
| 3 | US20190226101A1 | Solid oxide fuel cell with internal reformer | 13 |
| 4 | US8231774B2 | Thermal management of a high temperature fuel cell electrolyzer | 10 |
| 5 | WO2014177336A1 | Solid oxide stack system with thermally matched stack integrated heat exchanger | 7 |
| 6 | WO2023117301A1 | Solid oxide electrolysis cell core | 4 |
| 7 | EP3907310A1 | Systems and methods for generating synthesis gas for ammonia production | 4 |
| 8 | WO2023117303A1 | Solid oxide electrolysis cell core plant | 3 |
| 9 | WO2021223938A1 | Systems and methods for generating synthesis gas for ammonia production | 3 |
| 10 | US20210202964A1 | Regenerative solid oxide stack | 2 |
Citation counts favour older filings simply because they have had more time to accumulate them; treat this table as a map of historical influence, not of current commercial priority.
Each row carries its publication number; clicking a row searches Eureka by that number.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the data implies for R&D and IP strategy
Reading the filing trend, jurisdiction split and citation pattern together points to a field that rewarded early movers and now rewards precision over volume.
The rush has already happened
Activity climbed from 8 families in 2017 to 21 in 2022 and has not exceeded that since. New entrants filing broad efficiency claims now are filing into ground that is already dense with prior art from the 2020-2022 window.
US prosecution sets the bar
With more than double the filings of any single non-US office, US Patent Office file histories and examiner rejections are the most useful proxy for what will and will not clear novelty in this space.
Institutions file alone
Only three co-assignee pairs appear across 49 families, all clustered around the same small group of named inventors. Most organisations in this dataset hold their SOEC efficiency IP outright rather than through joint filings.
One filing anchors the field
US20190245224A1, covering high-temperature reversible electrolysis with a hydride tank coupled to the electrolyzer, is cited 85 times — far ahead of the next-most-cited record at 15. Anything touching reversible operation with integrated storage should be checked against it first.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to solid oxide electrolyzer efficiency enhancement, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| WILSON JAMES R | BLERSCHANK DAVID M | 1 |
| WILSON JAMES R | BARNETT SCOTT A | 1 |
| BLERSCHANK DAVID M | BARNETT SCOTT A | 1 |
The three identified co-assignee pairs all involve the same three named inventors, suggesting a single research group rather than a broader pattern of cross-institutional partnership in this dataset.
Who is filing, and where the gaps sit
Assignee activity in this 49-family dataset is led by a mix of national energy agencies, aerospace and combustion specialists, with recent-year filing counts at zero for the named organisations below — consistent with the broader plateau since the 2022 peak.
US Department of Energy
Named assignee on the most recent representative filing in this dataset, US20250305156A1, covering microwave-assisted and reversible proton-conducting SOEC designs. Its filing history spans multiple cell architectures rather than a single design family.
Boeing
Appears in the assignee ranking for this efficiency-focused SOEC slice, reflecting aerospace-sector interest in high-temperature electrolysis for auxiliary power and fuel synthesis applications.
French Alternative Energies and Atomic Energy Commission (CEA)
A recurring national-lab-style assignee in this dataset, consistent with CEA's long-running public research programme on high-temperature electrolysis and reversible SOFC/SOEC systems.
| Assignee | Recent year | YoY |
|---|---|---|
| Haldor Topsoe | 0 | — |
| Precision Combustion, Inc. | 0 | — |
| Dynetek Industries | 0 | — |
| French Alternative Energies and Atomic Energy Commission (CEA) | 0 | — |
| United States Department of Energy | 0 | — |
| Boeing | 0 | — |
| WILSON JAMES R | 0 | — |
| VELLORE INSITUTE OF TECH | 0 | -100% |
Where to take this analysis
The dataset points to a field with an identifiable leader in citations, a thin collaboration network, and several under-claimed technical branches worth a closer freedom-to-operate look.
Map claims against US20190245224A1
With 85 citations, this reversible high-temperature electrolysis filing is the single most influential prior-art reference in the dataset. Any new filing touching reversible operation with hydride or thermal storage should be benchmarked against its claim scope first.
Explore citation network in EurekaCheck the microwave-assisted and proton-conducting branches
US20250305156A1 combines several architectures — microwave assistance, proton conduction, reversibility — in one family. Adjacent variations on catalyst composition or field parameters may still be open.
Run a freedom-to-operate search in EurekaTrack US filings as the leading indicator
With 17 of the tracked families filed in the US against 8 at WIPO and 7 at the EPO, US prosecution outcomes are the earliest signal of where examiners are drawing novelty lines in this technology.
Monitor US filings in EurekaCommon questions about this landscape
This dataset identifies 49 patent families filed between 2015 and 2026 that combine solid oxide electrolyzer or SOEC terminology with efficiency-specific language such as thermoneutral operation, overpotential reduction and electrical efficiency, within the C25B1/04, C25B11 and C25B15 IPC classes. That is a narrow, efficiency-focused slice of the wider solid oxide electrolysis field, not a count of every SOEC patent filed. Broader searches without the efficiency-specific terms would return a larger set.
The named assignees in this dataset include national energy agencies and research institutions such as the US Department of Energy and the French Alternative Energies and Atomic Energy Commission, alongside aerospace and combustion-focused filers like Boeing. Recent-year filing momentum for these named organisations sits at zero, which is consistent with the broader plateau in filings since the 2022 peak rather than indicating any single filer has pulled ahead recently. Co-assignment is rare across the dataset, with only three co-assignee pairs identified, so most of the activity traces to single institutions filing independently.
Filings climbed from 8 families in 2017 to a peak of 21 in 2022 before flattening, a pattern consistent with an initial wave of foundational claims around overpotential reduction and thermal management being filed and then consolidated. Because patent publication lags filing by roughly 18 months, the apparent decline after 2022 is partly an artefact of that lag and the true recent-year count is likely understated. Readers should treat the post-2022 numbers as provisional rather than as confirmed evidence of a slowdown.
US20250305156A1, filed by the US Department of Energy and published in October 2025, claims a method of enhancing the electrolysis reaction in a solid oxide electrolysis cell by combining a catalyst made of conducting oxides with dispersed catalytically active materials, an applied electromagnetic field at a prescribed frequency and pulse mode, and a DC bias, applied to a water vapor stream in the cathode chamber. It spans several cell architectures named in the title — SOEC, H-SOEC, rH-SOEC and rSOEC — making it a broad reference point for anyone working on microwave-assisted or reversible proton-conducting electrolysis. Because it is very recent, its full citation and prosecution history is still developing.
Based on the IPC spillover into H01M, B01D, C01C and C10G and the language in recent filings, thinner claim coverage exists around microwave-assisted electrolysis, proton-conducting cell catalysts, reversible SOEC/SOFC heat integration, ammonia co-production pathways, and hydride-tank coupled storage systems. These branches show up as secondary classifications or abstract mentions rather than as the subject of dedicated efficiency claims. A freedom-to-operate search focused specifically on these sub-areas is more likely to surface open claim space than a general search on core overpotential-reduction terms, where the 2022 filing wave has already occupied much of the ground.
Research Solid Oxide Electrolyzer Efficiency Enhancement in depth with Eureka
Go past this page: query the whole solid oxide electrolyzer efficiency enhancement corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.