Solid Oxide Cell (SOC) Patent Landscape 2026
The SOC patent field is highly concentrated, with a small cluster of European research institutions and industrial players holding the dominant positions — CEA (France) leads decisively, followed by DTU and Haldor Topsoe. The field is in a multi-year Growth phase, with recent three-year filings well above the prior period, though annual volume has eased from its 2023 peak and the most recent filing years remain understated by publication lag.
CEA leads a concentrated field dominated by European research and industry
The SOC patent landscape is dominated by a compact group of European filers. CEA (Commissariat à l’Énergie Atomique et aux Énergies Alternatives) holds the top position with 358 patent records, nearly 2.4 times the count of second-ranked Danmarks Tekniske Universitet (DTU) at 149, and more than three times that of third-ranked Haldor Topsoe at 113.
The top five filers — CEA, DTU, Haldor Topsoe, Ceres Intellectual Property, and Samsung Electro-Mechanics — together account for 53% of the combined total among the hundred largest filers, signaling a strongly concentrated competitive structure with a pronounced gap between the top tier and the rest of the field.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | CEA (Commissariat à l’Énergie Atomique et aux Énergies Alternatives) | 358 | |
| 2 | Technical University of Denmark (DTU) | 149 | |
| 3 | Haldor Topsoe A/S | 113 | |
| 4 | Ceres Intellectual Property Company Limited | 43 | |
| 5 | Samsung Electro-Mechanics Co., Ltd. | 41 | |
| 6 | Bloom Energy Corporation | 37 | |
| 7 | Elcogen | 22 | |
| 8 | Toyota Central R&D Laboratories, Inc. | 21 | |
| 9 | Osaka Gas Co., Ltd. | 20 | |
| 10 | Battelle Memorial Institute | 17 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Korea Institute of Energy Research (KIER) | 15 | |
| 12 | Morimura SOFC Technology Co., Ltd. | 15 | |
| 13 | Technical Management Inc. | 15 | |
| 14 | Sumitomo Electric Industries, Ltd. | 15 | |
| 15 | TOTO Ltd. | 13 | |
| 16 | HTCeramix | 12 | |
| 17 | Versa Power Systems Ltd. | 12 | |
| 18 | Precision Combustion Inc. | 12 | |
| 19 | KOREA INST OF SCI & TECH | 11 | |
| 20 | Topsoe Fuel Cell A/S | 10 |
CEA’s scale, combined with its dual focus on fuel-cell (H01M) and electrolytic (C25B) applications, positions it as both a power-generation and electrolysis IP anchor. DTU’s depth in electrode materials (H01M 4) complements Haldor Topsoe’s balance across cell and stack design — suggesting coordinated research pipelines between Danish academic and industrial actors.
Filing counts for 2024–2026 are understated due to patent publication lag; trend reads for those years should be treated as preliminary. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Multi-year growth with a 2023 filing peak; technology mix anchored in H01M and C25B
The filing trend and technology composition charts together show a field that expanded significantly from 2020 onward, peaked in 2023, and remains above its earlier baseline — while the IPC mix reveals a clear dual-core structure around electrochemical cell design and electrolytic production.
Annual filing trend
Filings rose from a trough of 58 in 2019 to a peak of 168 in 2023, representing the clearest evidence of Growth-phase acceleration. The apparent drop in 2024 (86) and 2025 (44) reflects patent publication lag rather than a genuine demand reversal; the 2026 figure of 4 records is purely a lag artifact and should be disregarded for trend purposes.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells and fuel cells) is the dominant IPC class with 1,415 patent records, reflecting the core electrochemical cell design work. C25B (electrolytic production of compounds) is a substantial second branch at 702 records, consistent with growing interest in reversible SOC operation for hydrogen electrolysis. All other branches — including C01B, C04B, C22C, and C23C — are materially smaller, pointing to supporting materials and process work rather than competing core technology clusters.
↗ 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.
Methode zur Herstellung von reversiblen Festoxid-Z…
The present invention provides a method of producing a reversible solid oxide cell, comprising the steps of: – tape casting an anode support layer on a support (1); – tape casting an anode layer on a support (2); – tape casting an electrolyte layer on a support (3); and either – laminating said anode layer on top of said anode support layer; – removing said… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Integrated SOFC | 125 |
| 2 | A method for producing a reversible solid oxid fue… | 99 |
| 3 | Solid oxide fuel cell assembly | 73 |
| 4 | Tubular flat plate fuel cells and method of making… | 70 |
| 5 | Symmetrical, bi-electrode supported solid oxide fu… | 68 |
| 6 | Solid oxide cell (SOC) operation method and solid … | 65 |
| 7 | Advanced solid oxide fuel cell stack design for po… | 62 |
| 8 | Solid oxide fuel cell interconnect with catalyst c… | 62 |
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 SOC patent structure means for R&D investment decisions
The combination of high concentration, strong Growth-phase momentum, active institutional collaboration, and broad geographic filing coverage shapes a competitive environment where late entrants face high barriers in core cell design but may find adjacent materials and systems integration routes more accessible.
Growth phase, multi-year expansion with a 2023 peak
The SOC field is classified in the Growth lifecycle stage, with recent three-year filings 54% above the prior three-year window. Annual volume peaked in 2023 at 168 patent records and has eased since, though publication lag means 2024–2025 data are undercounted. The long-run trajectory remains upward, reflecting sustained R&D investment in both solid oxide fuel cell and electrolysis directions.
Growth · peak 2023Top five filers hold more than half of the leading-100 combined volume
The top five filers account for 53% of the hundred largest filers’ combined patent records — a concentration level that signals high barriers for new entrants in core H01M cell and stack design. The tier gap between CEA (358 records) and rank-five Samsung Electro-Mechanics (41 records) is wide enough that catching up through organic filing alone would require sustained multi-year investment. Bloom Energy and Elcogen, however, show new-entrant momentum that may compress the mid-tier over the next cycle.
High concentrationToyota Central R&D / Denso partnership leads co-filing; Danish academic-industry axis also active
The most active co-filing pair is Toyota Central R&D Laboratories and Denso Corporation with 9 joint patent records, indicating a tightly integrated Japanese automotive SOC development program. CEA co-files with CNRS (3 records) and Université d’Orléans (3 records), reflecting a French public-research consortium model. The Danish axis — DTU with Haldor Topsoe (3 records) and DTU with Topsoe Fuel Cell (2 records) — shows how the leading academic institution anchors a national industrial cluster. Osaka Gas and AIST (National Institute of Advanced Industrial Science and Technology) contribute 2 joint records in a further utility-research pairing.
Ecosystem clustersEurope (EPO) and the US tied at the top; Japan third; China growing
Europe (EPO) and the United States each show 248 patent records, confirming both regions as co-primary enforcement markets. Japan follows at 209 records, consistent with significant domestic industrial filing by Toyota Central R&D, Osaka Gas, Sumitomo Electric, and others. China at 156 records and WIPO (PCT) at 173 records indicate active international prosecution strategies and a rising Chinese filing presence. Canada and Australia also appear as secondary coverage markets.
Global · EPO/US co-leadGo 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 |
|---|---|---|
| Toyota Central R&D Laboratories, Inc. | Denso Corporation | 9 |
| CEA (Commissariat à l’Énergie Atomique et aux Énergies Alternatives) | CNRS (Centre National de la Recherche Scientifique) | 3 |
| CEA (Commissariat à l’Énergie Atomique et aux Énergies Alternatives) | University of Orléans | 3 |
| Technical University of Denmark (DTU) | Haldor Topsoe A/S | 3 |
| Technical University of Denmark (DTU) | Topsoe Fuel Cell A/S | 2 |
| Osaka Gas Co., Ltd. | National Institute of Advanced Industrial Science and Technology (AIST) | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
CEA anchors the field; Haldor Topsoe shows the strongest recent momentum among established players
The leader tier is defined by European research institutions and their industrial partners. Two players stand apart on both volume and recent trajectory: CEA with its commanding corpus and strong recent growth, and Haldor Topsoe with the highest momentum rate among established top-three filers.
Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA)
CEA holds 358 patent records — more than double the next-ranked applicant — with its portfolio spanning H01M fuel-cell design (356 records), C25B electrolytic production (261 records), and electrolysis balance-of-plant (210 records). This dual coverage across power-generation and hydrogen-production directions is the defining strategic characteristic. Recent filings are up 73% versus the prior period, indicating that CEA’s lead is actively widening rather than coasting on legacy filings.
patent records: 358Haldor Topsoe A/S
Haldor Topsoe ranks third overall with 113 patent records and shows the strongest recent momentum among established top-three filers at +82% versus the prior period. Its technology emphasis mirrors CEA’s dual H01M / C25B structure, with 108 H01M records and 60 C25B records, consistent with Topsoe’s commercial focus on both SOFC stacks and solid oxide electrolysis cells (SOEC) for green hydrogen. The Danish academic-industry collaboration with DTU (3 joint records) reinforces its stack-design pipeline.
patent records: 113| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| CEA (Commissariat à l’Énergie Atomique et aux Énergies Alternatives) | 83 | ▲ +73% |
| Technical University of Denmark (DTU) | 4 | ▲ new entrant |
| Haldor Topsoe A/S | 51 | ▲ +82% |
| Ceres Intellectual Property Company Limited | 5 | ▼ -86% |
| Samsung Electro-Mechanics Co., Ltd. | 36 | ▲ new entrant |
| Bloom Energy Corporation | 29 | ▲ new entrant |
| Elcogen | 8 | ▲ new entrant |
| Toyota Central R&D Laboratories, Inc. | 2 | ▲ new entrant |
Under-served branches in ceramics, alloys, and surface deposition adjacent to the SOC core
Several IPC branches sit at materially lower filing density than the dominant H01M and C25B classes. These are observations of relative sparsity within the existing corpus; where a branch also has plausible technical value and a realistic entry path, it is noted as worth monitoring.
C04B · Ceramics, cement and refractories
C04B appears at 41 patent records (roughly 2% of IPC assignments), despite ceramics being the structural backbone of SOC electrolyte and electrode layers. The sparsity is notable given that electrolyte densification, sintering profiles, and co-firing compatibility are persistent engineering challenges. A materials company or academic group with advanced ceramic processing capability could contribute differentiated IP in this branch with a relatively clear entry path — existing SOC filers do not appear to have heavily claimed ceramics process space.
Search this in Eureka →C23C · Coating and surface deposition
C23C sits at 37 patent records (approximately 1% of IPC assignments), a low share given that thin-film deposition and surface coating techniques — physical vapor deposition, atomic layer deposition, plasma spray — are central to fabricating high-performance SOC layers at reduced temperatures. This branch is under-served relative to its technical relevance. Entrants with expertise in vacuum deposition or thermal spray processes could find less crowded claim space here than in the core H01M stack-design territory.
Search this in Eureka →How leaders differ across technology routes
Route coverage across the main technology branches in the current evidence set.
| Player | H01M 8 · Batteries, cells & fuel cells | C25B 9 · Electrolytic production of compounds | C25B 1 · Electrolytic production of compounds | H01M 4 · Batteries, cells & fuel cells | C25B 15 · Electrolytic production of compounds |
|---|---|---|---|---|---|
| CEA (Commissariat à l’Énergie Atomique et aux Énergies Alternatives) | Strong · 356 | Strong · 261 | Strong · 210 | Emerging · 18 | Moderate · 128 |
| Technical University of Denmark (DTU) | Strong · 151 | Emerging · 18 | Absent | Strong · 128 | Absent |
| Haldor Topsoe A/S | Strong · 108 | Strong · 60 | Moderate · 35 | Emerging · 10 | Emerging · 13 |
| Samsung Electro-Mechanics Co., Ltd. | Strong · 41 | Moderate · 19 | Moderate · 18 | Moderate · 20 | Absent |
| Ceres Intellectual Property Company Limited | Strong · 43 | Strong · 24 | Strong · 24 | Absent | Absent |
| Bloom Energy Corporation | Strong · 35 | Moderate · 17 | Moderate · 9 | Emerging · 7 | Absent |
| Toyota Central R&D Laboratories, Inc. | Strong · 21 | Absent | Strong · 15 | Moderate · 8 | Moderate · 10 |
Frequently asked questions
The SOC corpus analyzed here contains 903 patent families in scope, covering both solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) applications globally.
CEA (Commissariat à l’Énergie Atomique et aux Énergies Alternatives) is the top-ranked applicant with 358 patent records, nearly 2.4 times the count of second-ranked Danmarks Tekniske Universitet (DTU) at 149 records.
The field is in the Growth stage. Recent three-year filings are 54% above the prior three-year window. Annual volume peaked in 2023 at 168 patent records and has eased since, but the multi-year trend remains expansionary. The apparent drop in 2024–2026 data is primarily a patent publication lag artifact.
Europe (EPO) and the United States are co-leading jurisdictions, each with 248 patent records. Japan follows at 209 records, WIPO (PCT) at 173, and China at 156. This distribution reflects both the research origins of leading filers and the primary commercial markets for SOC technology.
H01M (batteries, cells and fuel cells) dominates with 1,415 patent records, anchoring core cell and stack design. C25B (electrolytic production of compounds) is the substantial second branch at 702 records, reflecting the growing importance of SOEC for green hydrogen. Supporting branches — ceramics (C04B), alloys (C22C), coatings (C23C), and metal compounds (C01G) — are materially smaller and represent adjacent technical work.
The most active co-filing pair is Toyota Central R&D Laboratories and Denso Corporation with 9 joint patent records. CEA co-files with CNRS (3 records) and Université d’Orléans (3 records). The Danish academic-industry axis includes DTU with Haldor Topsoe (3 records) and DTU with Topsoe Fuel Cell (2 records). Osaka Gas and AIST account for 2 joint records in a utility-research pairing.
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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.
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