Molten Carbonate Fuel Cell Patents: Leaders, Trends & White Space 2026
- Filing peaked in 2020 (18 families) and has since flattened, with the 2022 midpoint at 14 — this is a maturing claim space, not a growing one.
- H01M carries 324 of 416 records, but C01B, C10J and F01K each hold a secondary cluster on gasification integration and thermal recovery that few filers touch twice.
- The most-cited prior art dates to 1985–2004, meaning the influential claims on thermal integration and gas separation are two decades old and largely open to challenge or design-around.
What the MCFC efficiency filing record shows
Molten carbonate fuel cell (MCFC) efficiency work sits at the intersection of electrochemistry and thermal plant engineering: claims on anode and electrolyte composition sit inside H01M, while a meaningful share of the corpus — gasification integration, steam and gas-turbine hybridisation, waste-heat recovery — is filed under IPC classes built for conventional power plants rather than fuel cells. That split matters for freedom-to-operate work, because a search confined to fuel-cell classifications alone would miss roughly a fifth of the relevant prior art. The 416 families in this dataset span 2015 through the partial 2026 year, drawn from a search string built around efficiency improvement, fuel utilisation improvement and waste heat recovery language layered onto MCFC and molten carbonate fuel cell terms.
Filing rose to a 2020 peak of 18 families and has not returned to that level since; the 2022 midpoint of 14 confirms the trend is flat-to-declining rather than accelerating. Because publication trails filing by roughly eighteen months, the last one or two years in any chart will understate real activity — but the shape of the decline from 2020 predates that lag effect and looks like a genuine cooling of new filing.
Filing trend and technology composition
Two views of the same 416-family dataset: how filing has moved year over year, and which IPC subclasses the claims actually sit in.
A flat-to-declining filing curve since 2020
From 5 families in 2017 to an 18-family peak in 2020, the annual count has since drifted down, with 2022 at 14 and the partial 2026 year showing no filings recorded yet. This is a signature of a technology area where the core claim territory has been staked out rather than one still opening up.
H01M dominates, but six adjacent classes carry real weight
H01M (batteries, cells and fuel cells) accounts for 324 of 416 records, but C01B (non-metallic elements and inorganic compounds, 79), C10J (fuel gasification, 42), F01K (steam and thermal power plants, 29), F02C (gas-turbine plants, 27), B01D (separation processes, 25), C25B (electrolytic production, 25) and F23G (incineration and waste burning, 21) together show that efficiency claims routinely reach into plant-integration and thermal-recovery engineering rather than staying inside electrochemistry alone.
Shares are the percentage of the 416 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 Efficiency Enhancement with Eureka
This page is one run against one query. Ask Eureka your own question about molten carbonate fuel cell efficiency enhancement and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art that still shapes the field
Anode for molten carbonate fuel cell having improved creep property (US20170187043A1)
Filed by the Korea Institute of Science and Technology, this application discloses an MCFC anode formulated with a creep-resistant additive added to a nickel-aluminium alloy and nickel base. The stated effect is improved sintering behaviour, creep resistance and mechanical strength in the finished anode.Filed 2017-06-29 — illustrative of the materials-science branch of the efficiency corpus rather than the plant-integration branch.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5554453A | Carbonate fuel cell system with thermally integrated gasification | 410 |
| 2 | US20150143806A1 | Quintuple-Effect Generation Multi-Cycle Hybrid Renewable Energy System with Integrated Energy Provisioning, S… | 266 |
| 3 | US20040251241A1 | Inductively coupled plasma/partial oxidation reformation of carbonaceous compounds to produce fuel for energy… | 215 |
| 4 | US20020142208A1 | Energy efficient gas separation for fuel cells | 204 |
| 5 | US4532192A | Fuel cell system | 196 |
| 6 | US6623880B1 | Fuel cell-fuel cell hybrid system | 186 |
| 7 | US6630113B1 | Methods and apparatus for treating waste | 168 |
| 8 | US6548197B1 | System integration of a steam reformer and fuel cell | 144 |
| 9 | US4622275A | Fuel cell power plant | 130 |
| 10 | US6607854B1 | Three-wheel air turbocompressor for PEM fuel cell systems | 124 |
Citation counts inside a searched corpus favour older filings that have had more years to accumulate references — read these as markers of influence on later drafting, not as evidence 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 filing pattern tells a technical team
Three read-outs from the trend, classification spread and citation ages, aimed at where to spend search and drafting time.
Growth has stalled since 2020
The rise from 5 filings in 2017 to 18 in 2020 was not sustained; the 2022 figure of 14 and the empty most-recent year point to a plateau. Teams entering now are working in a space where the earliest, broadest claims have already been staked.
Efficiency claims cross into plant engineering
C10J, F01K and F02C together account for close to a hundred records — gasification integration and turbine hybridisation are treated as efficiency levers here, not side topics. A search or clearance exercise limited to fuel-cell classes alone misses this material.
The influential claims are decades old
The most-cited record in the corpus, on thermally integrated gasification, dates to the mid-1980s; the next most-cited group runs through the early 2000s on gas separation and reformation. These are foundational rather than current, and several will be past their enforceable term.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to molten carbonate fuel cell efficiency enhancement, with the prior art for and against each one.
Assignee activity and where claim density is thin
Recent-year momentum across the tracked assignees has gone quiet across the board, which changes how a competitive scan should be read.
No assignee shows recent-year filing
ExxonMobil, FuelCell Energy, Manufacturing and Technology Conversion International, General Electric, Toyota and the Korea Institute of Machinery and Materials all show zero filings in the latest tracked year. Given publication lag, this likely reflects reporting delay as much as an actual halt, but it means recent competitive signal from these names is currently invisible in the public record.
Co-filing is concentrated in a few relationships
The strongest co-assignee pair in the dataset, Hollist Michele and Czernichowski Piotr, appears on 15 shared families; a Hitachi-affiliated pair and a further Hollist Michele pairing with a ceramics-technology partner round out the top links. Ten pairs total is a small, tight collaboration network rather than a broad ecosystem.
US and Europe carry the bulk of filings
The United States (109) and the European Patent Office (77) lead, with PCT applications (45), Japan (37), Australia (27) and Canada (22) behind. That spread favours US and EPO clearance work first, with PCT filings as the leading indicator of where applicants intend broader coverage.
| Assignee | Recent year | YoY |
|---|---|---|
| ExxonMobil Technology and Engineering Company | 0 | — |
| FuelCell Energy, Inc. | 0 | — |
| Manufacturing and Technology Conversion International, Inc. | 0 | — |
| General Electric Company | 0 | — |
| Toyota Motor Corporation | 0 | — |
| Korea Institute of Machinery and Materials | 0 | — |
| HOLLIST MICHELE | 0 | — |
| CZERNICHOWSKI PIOTR | 0 | — |
Where to take this analysis
The filing record answers what has been claimed; the next questions are what still can be, and by whom.
Map claim scope against the under-claimed branches
Cross-reference the gasification, turbine-hybridisation and separation classes against your own roadmap to see where a first-mover claim is still realistic.
Explore claim mapping in Eureka →Track the assignees showing zero recent filings
A quiet public record does not mean quiet R&D — watch for the eighteen-month publication lag to resolve before concluding these players have stepped back.
Set up assignee monitoring in Eureka →Common questions on MCFC efficiency patents
In this dataset, a record qualifies if it combines molten carbonate fuel cell or MCFC terminology with language around efficiency improvement, fuel utilisation improvement, or waste heat recovery. That means the corpus includes not just electrochemical cell design but also plant-level integration work such as gasification coupling, steam-cycle bottoming and gas-turbine hybridisation, since these are the mechanisms by which real-world MCFC installations gain efficiency. A search limited to fuel-cell-specific IPC classes alone would under-represent this plant-integration side of the field.
Filing rose from 5 families in 2017 to a peak of 18 in 2020, then eased to 14 by 2022 and shows no recorded activity in the most recent partial year. Part of that recent-year gap is publication lag, since filings typically take around eighteen months to appear in public databases, so the true 2025-2026 count is understated. But the decline from the 2020 peak predates that lag window and is more likely a genuine sign that core claim territory in efficiency-focused MCFC work has already been staked out by earlier filers.
The tracked assignee list includes established fuel-cell and industrial names such as FuelCell Energy, ExxonMobil, General Electric, Toyota, and the Korea Institute of Machinery and Materials, alongside Manufacturing and Technology Conversion International. All six show zero filings in the latest tracked year, which given publication lag should be read as a data gap rather than a confirmed pullback. A useful next step is comparing family counts and filing recency for each name individually rather than relying on the most-recent-year snapshot alone.
The technology composition data shows heavy concentration in H01M (batteries and fuel cells, 324 of 416 records) with thinner but real activity in C10J gasification, F01K steam-cycle integration, F02C gas-turbine plants, B01D separation, C25B electrolytic production and F23G incineration. Branches like cathode-side carbon capture integration, sulphur-tolerant electrolyte formulations and syngas conditioning for MCFC feed sit at the edges of these classes with comparatively few dedicated filings. These are reasonable areas to search closely before drafting, since lower filing density can mean either genuine white space or simply that the claims are scattered across adjacent, non-obvious classifications.
The most-cited record in the corpus is a 1985 filing on thermally integrated carbonate fuel cell and gasification systems, cited 410 times, followed by records from the mid-1990s through mid-2000s covering energy system integration, plasma reformation and gas separation for fuel cells. High citation counts in a searched corpus tend to accumulate over time, so older filings are naturally overrepresented among the most-cited regardless of current commercial relevance. Several of these foundational patents are old enough that their enforceable term has likely expired, which changes how they should be treated in a freedom-to-operate analysis versus a prior-art search.
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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.