MCFC Green Hydrogen Patents: Leaders, Trends & White Space 2026
- Filings peaked in 2020 at 15 and have since flattened, with the 2022 midpoint at 9 — a mature claim base rather than a growing one.
- H01M and C25B dominate at 63 and 48 records respectively, while H02J power-conversion claims (19) sit noticeably thinner around the same stacks.
- The most-cited record, US20050112425A1, carries 94 citations, more than five times the next-ranked document — a strong signal of foundational, hard-to-avoid prior art.
What this landscape covers
Molten carbonate fuel cells (MCFC) can run in reverse or in hybrid configurations to co-produce hydrogen alongside power generation or carbon capture, using the same electrolyte chemistry that has underpinned stationary fuel cell deployments for two decades. This landscape tracks 74 patent families published between 2015 and mid-2026 that combine MCFC or reversible-carbonate-cell claims with electrolysis, hydrogen co-production or carbonate-electrolysis language. Publication lags filing by roughly 18 months, so the most recent filing year is understated in any trend line drawn from this data.
The technology sits at the intersection of established fuel cell hardware (H01M) and electrolytic production processes (C25B), with a smaller but persistent cluster of power-electronics claims (H02J) covering how these stacks are integrated with grids or DC systems. Filing activity is concentrated in a handful of jurisdictions and a small set of assignees, with a long tail of single-filing entrants typical of a technology still defining its commercial architecture.
Filing trends and technology composition
Two views of the same 74-family dataset: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
A flat-to-declining filing curve
Filings rose from zero in 2017 to a peak of 15 in 2020, then eased back through a midpoint of 9 in 2022. That pattern reads as an early wave of foundational filings followed by consolidation rather than sustained expansion — though the final one or two years are always undercounted at this cut-off date given publication lag.
Claim density concentrated in two subclasses
H01M (63 records) and C25B (48 records) between them account for the bulk of filing activity, confirming that most inventive effort sits on the fuel cell hardware itself and on the electrolytic conversion process. H02J (19), B01D (9) and C01B (9) form a secondary tier covering power integration, gas separation and inorganic process chemistry; B32B, B33Y and C01F each register only one or two records and mark genuinely thin ground.
Shares are the percentage of the 74 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Molten Carbonate Fuel Cell Green Hydrogen Production with Eureka
This page is one run against one query. Ask Eureka your own question about molten carbonate fuel cell green hydrogen production and every answer comes back with the patent numbers behind it.
Try EurekaThe documents shaping this space
Carbon capture system (US20250177902A1)
A carbon capture system may include a pressure swing adsorption unit for producing a product gas and a tail gas comprising at least one carbonaceous gas. The carbon capture system may include a molten carbonate fuel cell having a cathode and an anode for transferring CO2 from the cathode to the anode. The molten carbonate fuel cell may be a multi-stage fuel cell where the anode is in fluid communication with the pressure swing adsorption unit for receiving at least a portion of the tail gas as an inlet stream.Filed by Universiteit Utrecht Holding B.V., published 2025-06-05 — one of the most recent records in the dataset and a useful marker of where filing activity has moved: multi-stage MCFC architecture coupled directly to gas-separation hardware.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20050112425A1 | Fuel cell for hydrogen production, electricity generation and co-production | 94 |
| 2 | WO2020201485A1 | Electrolysis system with controlled thermal profile | 18 |
| 3 | EP4027419A1 | Power converter systems for electrolysis stacks | 12 |
| 4 | US20200075981A1 | Low pressure carbon dioxide removal from the anode exhaust of a fuel cell | 10 |
| 5 | US9297082B2 | Process for synthesis of calcium oxide | 9 |
| 6 | EP1683216A2 | Fuel cell for hydrogen production, electricity generation and co-production | 9 |
| 7 | EP3719171A1 | Electrolysis system with controlled thermal profile | 8 |
| 8 | US20140339095A1 | Process for synthesis of calcium oxide | 8 |
| 9 | WO2005041325A2 | Fuel cell for hydrogen production, electricity generation and co-production | 8 |
| 10 | US20180261864A1 | Fuel cell system having enhanced co2 capture | 6 |
Citation counts inside a searched corpus favour older, longer-indexed records — read them as a measure of influence on later filings, not as a ranking of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three read-throughs from the trend, citation and IPC data that matter more than the headline family count.
One foundational document dominates the field
US20050112425A1 carries 94 citations against a second-place figure of 18 for WO2020201485A1. Any freedom-to-operate review in this space has to start with that single document rather than treating citation counts as evenly distributed across the corpus.
Activity has flattened since its 2020 peak
The filing count fell from a peak of 15 in 2020 to 9 at the 2022 midpoint. Combined with a 2017 baseline of zero, this describes a technology that had one concentrated wave of early filings rather than a steadily compounding one.
Power integration claims lag hardware claims
H01M hardware claims outnumber H02J power-conversion and grid-integration claims by more than three to one. That gap suggests stack design has been claimed far more thoroughly than the systems needed to connect these units to power infrastructure at scale.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to molten carbonate fuel cell green hydrogen production, with the prior art for and against each one.
Who is filing, and where the gaps sit
Filing activity clusters around a small set of assignees with recurring co-filing relationships, alongside a long tail of single-family filers.
A tight three-way collaboration anchors the corpus
Three co-assignee pairs each register a strength of 3: a European energy group working alongside a Dutch university holding company and an Italian technical university, in overlapping combinations. That triangle points to a shared research programme rather than three independent efforts.
No assignee shows fresh-year filing activity
Every one of the six assignees tracked for recent-year momentum shows zero filings in the latest year, consistent with the broader flat-to-declining trend. Given publication lag, this likely understates true activity rather than confirming a full stop.
Filing is spread across parallel jurisdictions, not concentrated in one
The United States (15) and the European Patent Office (13) lead, with WIPO/PCT filings (11) close behind and Canada, Australia and Chile each in single digits. That spread suggests applicants are still hedging jurisdiction rather than committing to one primary market.
| Assignee | Recent year | YoY |
|---|---|---|
| Dianfeng Electric Control Co. | 0 | — |
| FuelCell Energy, Inc. | 0 | — |
| Ztek Corporation | 0 | — |
| TotalEnergies OneTech | 0 | — |
| Universiteit Utrecht Holding B.V. | 0 | — |
| Politecnico di Milano | 0 | — |
| George Washington University | 0 | — |
| Safran | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, whitespace filing, or competitive tracking.
Run a freedom-to-operate check against the top-cited document
With US20050112425A1 carrying more than five times the citations of any other record in the corpus, any new filing on hydrogen co-production via MCFC should be checked against its claim scope before drafting.
Explore in EurekaTrack the co-filing cluster for early signals
The recurring three-way collaboration around carbonate electrolysis and hydrogen co-production is a leading indicator of where the next wave of filings is likely to originate.
Explore in EurekaDraft around thin H02J and B01D claim density
Power integration and gas-separation claims are comparatively sparse next to the core H01M/C25B base, leaving room for narrowly targeted filings in those subclasses.
Explore in EurekaCommon questions on this landscape
A molten carbonate fuel cell (MCFC) is a high-temperature fuel cell that normally converts a fuel and an oxidant into electricity using a molten carbonate salt electrolyte. Run in reverse, or in a hybrid configuration, the same electrochemistry can be used to split water or process gas streams and co-produce hydrogen alongside electricity or carbon capture. This dual-mode capability is why patent claims in this dataset span both H01M fuel cell hardware and C25B electrolytic production classifications rather than sitting in one category alone.
Filing activity in this dataset clusters around a small group of assignees connected by recurring co-filing relationships, most notably a three-way collaboration involving a European energy group, a Dutch university holding entity and an Italian technical university. Beyond that cluster, the corpus shows a long tail of single-family filers typical of a technology still in an exploratory phase. The most-cited underlying document, however, dates to an earlier, foundational filing rather than to any of the currently active co-filers.
The filing trend in this dataset does not show sustained growth. Activity rose from zero in 2017 to a peak of 15 filings in 2020, then eased to 9 at the 2022 midpoint, and recent-year momentum figures show zero filings in the latest tracked year across every assignee monitored. Because publication lags filing by around 18 months, the most recent one to two years are understated, but the overall shape is flat to declining rather than expanding.
The clearest gaps sit adjacent to the dense H01M and C25B core: power converter topologies for electrolysis stack integration (H02J is claimed at less than a third the density of H01M), low-pressure CO2 removal from anode exhaust streams, and additive-manufactured stack components, which register only a couple of records in the entire corpus. These are areas where the underlying chemistry is well established but the specific engineering implementation has not been heavily claimed.
The most-cited record, US20050112425A1, covers a fuel cell architecture for hydrogen production, electricity generation and co-production, and carries 94 citations — more than five times any other document in the corpus. Its scope makes it the natural starting point for any freedom-to-operate review of new MCFC-based hydrogen co-production filings. Later, more specific documents such as WO2020201485A1 and EP4027419A1 build on adjacent thermal and power-conversion aspects rather than displacing this foundational claim base.
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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.