SOFC Electrical Efficiency & Power Density Patent Landscape
The SOFC electrical efficiency and power density patent field is moderately concentrated, with Saint-Gobain Ceramics & Plastics leading by patent records and a small industrial-academic tier dominating activity. Annual filing volume has eased from its 2021 peak, signalling a maturing field where incremental cell and stack engineering now competes with emerging balance-of-plant and coating approaches.
Saint-Gobain leads a moderately concentrated field with a strong academic second tier
Saint-Gobain Ceramics & Plastics holds the top-ranked position with 99 patent records, followed closely by Delphi Technologies (83) and Ceres Intellectual Property (55), with Bloom Energy (52) and the Atomic Energy Council – Institute of Nuclear Energy Research (50) rounding out the top five.
The top five filers account for 21% of the combined total across the hundred largest filers, indicating moderate rather than extreme concentration. The gap between the leader and the second-ranked filer is narrow, and the top-ten list blends industrial players with universities and national laboratories, suggesting no single incumbent has locked up the space.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | SAINT GOBAIN CERAMICS & PLASTICS INC | 99 | |
| 2 | Delphi Technologies Inc | 83 | |
| 3 | Ceres Intellectual Property Company Limited | 55 | |
| 4 | Bloom Energy Corp | 52 | |
| 5 | Atomic Energy Council – Institute of Nuclear Energy Research | 50 | |
| 6 | Corning Inc | 44 | |
| 7 | The Trustees of the University of Pennsylvania | 40 | |
| 8 | LG Fuel Cell Systems Inc | 39 | |
| 9 | Technical University of Denmark (DTU) | 38 | |
| 10 | University of Florida Research Foundation Inc | 37 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | University of Maryland | 32 | |
| 12 | Qusir Tech | 31 | |
| 13 | Alberta Research Council Inc | 28 | |
| 14 | Toho Gas Co Ltd | 27 | |
| 15 | Phillips 66 Co | 27 | |
| 16 | Haldor Topsoe A/S | 26 | |
| 17 | Battelle Memorial Institute | 26 | |
| 18 | Redox Power Systems LLC | 24 | |
| 19 | Honeywell International Inc | 23 | |
| 20 | Versa Power Systems Ltd | 23 |
The presence of Corning, the University of Pennsylvania, Danmarks Tekniske Universitet, and the University of Florida Research Foundation in the top ten signals that academic institutions remain active innovators in cell materials and fabrication, creating licensing opportunities and potential partnership targets for industrial players seeking to augment their stack-performance portfolios.
Patent records from 2024 onward are likely under-counted due to publication lag and should not be interpreted as representing the full filing activity for those years. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filings eased from a 2021 peak; electrochemical cell IP dominates but coating and ceramic branches are active
The annual filing trend reveals a field that grew to a 2021 high before pulling back, while the technology composition chart shows a clear primary branch surrounded by several materials and process sub-branches that carry meaningful filing volume.
Annual filing trend
Annual filings peaked at 59 records in 2021 and have trended lower since. Figures for 2024 and 2025 are substantially under-counted due to publication lag and should not be read as a continuation of the decline; 2026 data (2 records) is effectively incomplete. The multi-year window still reflects a substantive body of activity built up from 2017 onward.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells and fuel cells) overwhelmingly dominates the IPC branch mix, consistent with a corpus centred on electrochemical cell performance. The next-largest branches — C04B (ceramics and refractories), C01B (inorganic compounds), B05D (coating processes), B01D (separation processes), and C23C (coating and surface deposition) — reflect the centrality of electrolyte and electrode materials engineering, thin-film deposition, and gas-management to efficiency gains. Smaller clusters around F02C (gas-turbine plants), B60L (electric vehicle propulsion), and B64D (aircraft equipment) point to niche system-integration efforts.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Electrolyte composition for solid oxide fuel cell,…
The invention provides an electrolyte composition for solid oxide fuel cells, and a solid oxide fuel cell. The electrolyte composition has high electrical conductivity over a wide temperature range and is capable of imparting excellent output characteristics to a solid oxide fuel cell. Specifically, the invention provides a scandium oxide-stabilized… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Energy efficient gas separation for fuel cells | 204 |
| 2 | MEMS-based thin-film fuel cells | 196 |
| 3 | High efficiency load-following solid oxide fuel ce… | 189 |
| 4 | Solid oxide fuel cell stack and packet designs | 185 |
| 5 | Fabrication of a monolithic solid oxide fuel cell | 183 |
| 6 | Fuel water vapor replenishment system for a fuel c… | 173 |
| 7 | Hybrid thin film/thick film solid oxide fuel cell … | 173 |
| 8 | Load matched power generation system including a s… | 162 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for SOFC R&D investment
Three structural features — a maturing filing cycle, moderate concentration, a mixed industrial-academic ecosystem, and a heavily Western filing geography — shape where new entrants and incumbents can most efficiently deploy R&D resources.
Field in decline phase: 2021 peak passed, annual volume contracting
The lifecycle stage is classified as Decline, with annual filings easing back from the 2021 peak of 59 records. This pattern is consistent with a maturing electrochemical engineering domain where core cell-stack architectures are well-patented and incremental performance gains offer diminishing novelty returns. New entrants should focus on differentiated sub-areas — particularly balance-of-plant, hybrid system integration, and advanced coating routes — rather than re-ploughing heavily covered core electrolyte IP.
Lifecycle: DeclineModerate concentration; top five hold 21% of the hundred largest filers’ output
The top five filers account for 21% of the combined patent records across the hundred largest filers, indicating a competitive field without a dominant monopolist. The narrow gap between Saint-Gobain (99 records) and Delphi Technologies (83 records) means the leader’s position is contestable. The deep bench of mid-tier filers — Corning, LG Fuel Cell Systems, Haldor Topsoe, Battelle, Redox Power Systems — suggests multiple credible technical trajectories remain open.
Moderate concentrationLimited co-filing observed; Delphi–BMW and Ceres–Weichai are the active pairs
Evidence shows two co-filing relationships: Delphi Technologies with BMW (2 joint filings) and Ceres Intellectual Property with Weichai Power (1 joint filing). The Ceres–Weichai pairing is strategically notable, linking a UK IP-licensing specialist to a major Chinese powertrain manufacturer, and may foreshadow broader Asian commercialisation of steel-cell SOFC technology. The low overall co-filing count suggests the field remains predominantly proprietary, and broad cross-industry collaboration partnerships represent an under-explored route to accelerated development.
Low collaboration densityUS and EPO filings dominate; China and Asian markets are secondary but growing
The United States leads in patent-record filings at 643, followed by EPO (449) and WIPO-PCT (242), reflecting the primary commercial and regulatory focus of leading filers. Canada (139) and Australia (120) score relatively high, likely driven by the Alberta Research Council’s activity. China (74), Germany (61), South Korea (41), and Japan (40) form a secondary tier. The relatively modest China filing count is notable given domestic fuel-cell policy interest, suggesting either early-stage commercialisation or that leading applicants have not yet prioritised Chinese protection — either scenario creates a strategic consideration for entrants targeting Asian markets.
US-EPO centricGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Delphi Technologies Inc | BMW AG | 2 |
| Ceres Intellectual Property Company Limited | Weichai Power Co Ltd | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Saint-Gobain and Delphi Technologies lead by record count with distinct technical emphasis
The two largest filers occupy different points on the materials-to-systems spectrum: Saint-Gobain anchors in electrolyte ceramics and rare-earth compounds, while Delphi Technologies extends across fuel-cell stack IP into combustion-adjacent system integration.
Saint-Gobain Ceramics & Plastics
Saint-Gobain Ceramics & Plastics holds 99 patent records, the highest in the corpus. Its technology emphasis is tightly centred on H01M 8 (fuel cell stacks and systems, 96 records) and H01M 4 (electrodes, 46 records), supplemented by C01F 17 (rare-earth and alkaline-earth compounds, 7 records) — a profile consistent with advanced electrolyte and electrode materials for high-efficiency cells. No momentum data is available in the evidence base, so trajectory cannot be quantified.
patent records: 99Delphi Technologies
Delphi Technologies ranks second with 83 patent records. Its portfolio is concentrated in H01M 8 (96 records across its filings), with a secondary footprint in F02B 1 (internal-combustion engine integration, 15 records) and H01M 4 (electrodes, 11 records). The combustion-engine adjacency suggests Delphi pursued hybrid reformer-SOFC architectures, likely targeting automotive and APU applications. A collaboration with BMW (2 joint filings) reinforces the automotive system-integration angle. No momentum data is available to quantify recent filing trajectory.
patent records: 83Under-served coating, ceramic, and separation branches adjacent to the core SOFC stack IP
The whitespace analysis flags five IPC branches that sit outside the dominant H01M core but carry technically relevant filing activity; their lower relative shares signal areas where the IP landscape is less crowded than cell-stack fundamentals.
C04B · Ceramics, cement & refractories
With 158 patent records, C04B is the largest adjacent branch but still holds only a 5% share relative to H01M, suggesting that advanced ceramic processing — sintering aids, porous support structures, and co-firing optimisation for electrolyte/electrode layers — remains less exhaustively covered than the cell electrochemistry itself. For a materials or process engineering team, this branch represents a plausible entry point: novel ceramic fabrication routes that improve electrolyte density or reduce sintering temperatures directly translate to power density gains and are distinct enough from existing H01M claims to be patentable.
Search this in Eureka →B05D / C23C · Coating and surface deposition
B05D (coating processes, 86 records) and C23C (coating and surface deposition, 56 records) together cover thin-film and thick-film deposition routes for cathodes, anodes, and interconnects. Their combined share remains modest relative to the overall corpus, and the most-cited patents in the field include a hybrid thin-film/thick-film SOFC title — indicating that deposition technology is valued but not yet heavily contested. Teams with PVD, ALD, or spray pyrolysis capabilities could use these branches to stake differentiated positions in low-temperature SOFC fabrication, where coating quality is a primary lever for improving power density at reduced operating temperatures.
Search this in Eureka →Frequently asked questions
The corpus encompasses 380 patent families in scope, spanning filings across major global patent offices.
Saint-Gobain Ceramics & Plastics holds the largest position with 99 patent records, followed by Delphi Technologies with 83 and Ceres Intellectual Property with 55.
The United States leads with 643 patent records, followed by EPO (449) and WIPO-PCT (242). Canada (139) and Australia (120) also feature prominently, reflecting the geographic scope of major filers.
The field is classified as Decline, with annual filing volume easing from a peak of 59 records in 2021. Figures for 2024 and 2025 are under-counted due to publication lag and do not necessarily indicate the full extent of recent activity.
After the dominant H01M class, the most active adjacent branches are C04B (ceramics and refractories, 158 records), C01B (inorganic compounds, 98), B05D (coating processes, 86), B01D (separation processes, 81), and C23C (coating and surface deposition, 56).
The evidence shows two co-filing pairs: Delphi Technologies with BMW (2 joint filings) and Ceres Intellectual Property with Weichai Power (1 joint filing). Overall co-filing density is low, indicating that most IP development remains proprietary.
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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.
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