SOFC Thermal & Fuel Control Patent Landscape 2026
The SOFC thermal and fuel control patent field is Japan-led and moderately concentrated, with Nissan Motor the dominant filer and a multi-year growth trajectory of 110% despite annual volume easing from its 2018 peak. Chinese institutions are rising as a second wave, and the technology mix remains heavily anchored in core fuel-cell engineering with several adjacent control and vehicle-integration branches still sparsely covered.
Nissan Motor leads a Japan-anchored field with rising Chinese participation
Nissan Motor Co Ltd holds the top-ranked position with 76 patent records, more than double the second-ranked TOTO Ltd at 35, establishing a clear tier-one lead that is unusual in mid-sized technology domains.
The top five filers account for 40% of the combined total of the hundred largest filers, indicating moderate-to-high concentration at the apex but meaningful room for challengers: Tokyo Gas, Huazhong University of Science and Technology, and Kyocera each hold credible mid-tier positions.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Nissan Motor Co Ltd | 76 | |
| 2 | TOTO Ltd | 35 | |
| 3 | Tokyo Gas Co Ltd | 18 | |
| 4 | HUAZHONG UNIV OF SCI & TECH | 16 | |
| 5 | Kyocera Corp | 16 | |
| 6 | NIPPON TELEGRAPH & TELEPHONE CORP | 14 | |
| 7 | Mitsubishi Power Ltd | 14 | |
| 8 | JX NIPPON OIL & ENERGY CORP | 12 | |
| 9 | Panasonic Holdings Corp | 11 | |
| 10 | Southeast University | 10 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Mitsubishi Heavy Industries Ltd | 10 | |
| 12 | Guangzhou Power Supply Bureau, Guangdong Power Grid Co Ltd | 10 | |
| 13 | Upstart Power Inc | 9 | |
| 14 | Hitachi Ltd | 8 | |
| 15 | Robert Bosch GmbH | 7 | |
| 16 | Weichai Power Co Ltd | 7 | |
| 17 | The Boeing Company | 7 | |
| 18 | Dalian Institute of Chemical Physics, Chinese Academy of Sciences | 5 | |
| 19 | Panasonic Intellectual Property Management Co Ltd | 5 | |
| 20 | Morimura SOFC Technology Co Ltd | 4 |
Nissan’s lead, combined with TOTO’s strong second position, signals that automotive and ceramics/materials incumbents have built the deepest prior-art moats; any entrant must design around or license from this pair before scaling SOFC thermal management IP.
Filing counts for 2024–2026 are understated due to standard patent publication lag; the apparent slowdown in those years should not be read as market deceleration. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Multi-year growth of 110% with technology anchored in core fuel-cell engineering
The annual filing trend and the IPC branch breakdown together reveal a field that expanded sharply from 2017 and retains a concentrated technology core, while adjacent branches remain thinly populated.
Annual filing trend
Filings surged from 14 records in 2017 to a peak of 32 in 2018, then settled into a lower band through 2021 before recovering toward 25 in 2024. The three-year recent window is 110% above the prior three-year window, confirming multi-year expansion. The 2025–2026 bars are further suppressed by publication lag and should not be read as a genuine decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells and fuel cells) dominates with 381 patent records, dwarfing every other branch. C01B (non-metallic elements and inorganic compounds, 30 records), B60L (electric vehicle propulsion, 21 records), and H02J (power supply and grid systems, 17 records) form a distant second tier. Combustion control (F23N, 6 records) and general control systems (G05B, 6 records) are present but sparse, suggesting that system-level and hybrid-control work remains an underexplored frontier relative to core cell chemistry.
↗ 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.
Solid oxide fuel cell system and solid oxide fuel …
This solid oxide fuel cell system comprises: a solid oxide fuel cell; a combustor disposed on a cathode gas supply line of the fuel cell; a fuel supply unit supplying a fuel to the combustor; and a cathode gas supply unit supplying a cathode gas to the cathode gas supply line. The solid oxide fuel cell system comprises a stop control unit performing, as the… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 一种固体氧化物燃料电池系统及热电协同控制方法 | 66 |
| 2 | Fuel cell system and control method | 66 |
| 3 | Fuel cell cogeneration system and its control method | 53 |
| 4 | Thermoelectric cooperative control method for SOFC… | 42 |
| 5 | 一种固体氧化物燃料电池的混合能量控制系统及控制方法 | 39 |
| 6 | Electrical power distribution system and method fo… | 35 |
| 7 | Fuel cell system, hybrid power generation system, … | 34 |
| 8 | Combined power generation system and unit, method,… | 34 |
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 R&D investment decisions
Four structural observations — maturity stage, concentration gradient, collaboration patterns, and jurisdictional spread — each carry direct implications for where new R&D investment can differentiate.
Growth stage with an eased annual pace
The lifecycle evidence classifies SOFC thermal and fuel control as a Growth-stage field. The recent three-year filing window sits 110% above the prior three-year window, confirming sustained multi-year expansion. Annual volume has nonetheless eased from its 2018 peak, so the field is expanding on a portfolio basis rather than accelerating month-by-month — a signal that foundational patents are maturing while system-integration and control-algorithm work is still being filed.
Growth stageStrong apex concentration with an accessible mid-tier
The top five filers hold 40% of the hundred largest filers’ combined total, with Nissan Motor alone accounting for the largest single share at 76 patent records. The gap between Nissan (76) and TOTO (35) is large, but the mid-tier — Tokyo Gas at 18, Huazhong University and Kyocera both at 16 — is close enough that a focused filing campaign in adjacent branches could shift relative standing within two to three years.
Moderate-high concentrationTOTO–Panasonic dyad is the most active co-filing pair
The most active co-applicant relationship is TOTO Ltd (TOTO Ltd) and Panasonic Holdings Corp, with five jointly filed records. TOTO also co-files with Hitachi (2 records), and Tokyo Gas co-files with Kyocera (2 records). Huazhong University of Science and Technology jointly files with both its Shenzhen and Ezhou research institutes. These dyads suggest that materials-plus-systems and utility-plus-ceramics pairings are the dominant collaboration models; an entrant with complementary control-software capability could be an attractive partner for either cluster.
Dyad-led ecosystemChina leads in patent records; Japan and the US are core secondary offices
China is the lead jurisdiction with 128 patent records, followed by Europe (EPO, 69), Japan (64), and the United States (60). WIPO/PCT filings stand at 20, and Canada records 10. The China-first pattern reflects both the rising Chinese institutional filers (Huazhong University, Guangzhou Power Supply Bureau) and the filing strategies of Japanese incumbents who protect in China. An R&D team targeting export markets should prioritize EPO and US prosecution to build a position in the two largest non-China enforcement venues.
China-led, EPO/US secondaryGo 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 |
|---|---|---|
| TOTO Ltd | Panasonic Holdings Corp | 5 |
| TOTO Ltd | Hitachi Ltd | 2 |
| Huazhong University of Science and Technology | Huazhong University of Science and Technology Research Institute Shenzhen | 2 |
| Tokyo Gas Co Ltd | Kyocera Corp | 2 |
| Huazhong University of Science and Technology | Ezhou Institute of Industrial Technology, Huazhong University of Science and Technology | 1 |
| Kyocera Corp | Okino Kenta | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Nissan Motor commands the top position; Guangzhou Power Supply Bureau is the fastest-rising new entrant
Two players illustrate the field’s structural contrast: a long-established automotive incumbent with deep core-cell IP, and a state-grid utility that entered recently with a concentrated burst of filings.
Nissan Motor Co Ltd
Nissan Motor holds 76 patent records, the largest portfolio in this corpus by a wide margin. Its technology emphasis is concentrated in H01M 8 (core fuel-cell engineering, 76 records), with secondary coverage in B60L 11 (electric vehicle propulsion, 11 records) and C01B 3 (reforming chemistry, 10 records) — a profile consistent with vehicle-integrated SOFC systems. Its applicant momentum trend is flagged as a new entrant in the recent window, which given the large legacy base most likely reflects a pause in recent filings rather than genuine new entry.
patent records: 76Guangzhou Power Supply Bureau (Guangdong Power Grid)
Guangzhou Power Supply Bureau of Guangdong Power Grid holds 10 patent records and is classified as a new entrant in the recent filing window, with all 10 of its records appearing in the most recent period. Its focus is exclusively in H01M 8 (fuel-cell engineering). As a state-grid utility, its interest likely centers on stationary power and grid-integration applications of SOFC, a vector that is distinct from the automotive and ceramics-led incumbents and may indicate a coming wave of utility-sector filings.
patent records: 10| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Nissan Motor Co Ltd | 1 | ▲ new entrant |
| Huazhong University of Science and Technology | 2 | ▲ new entrant |
| Guangzhou Power Supply Bureau, Guangdong Power Grid Co Ltd | 10 | ▲ new entrant |
Under-served branches in combustion control and grid integration
Several IPC branches appear in the corpus but carry only a small share of patent records relative to the dominant H01M core; these represent areas of relative sparsity adjacent to the main technology. Two stand out for plausible technical relevance and realistic entry paths.
F23N · Combustion Control
F23N (combustion control) accounts for only 6 patent records — roughly 1% of branch-level records — despite being directly relevant to reformer burner management and anode-off-gas combustion in SOFC balance-of-plant. Panasonic Holdings is one of the few filers with explicit F23N coverage alongside H01M, suggesting the overlap is technically validated but underdeveloped. An entrant with combustion-control expertise (e.g., from industrial burner or gas-turbine backgrounds) could file in this sparse intersection and build differentiated IP that incumbents would need to license for full-system products.
Search this in Eureka →H02J · Power Supply & Grid Systems
H02J (power supply and grid systems) holds 17 patent records — 3% of branch-level records — despite SOFC’s growing role in stationary distributed generation and microgrid applications. The emerging presence of Guangzhou Power Supply Bureau as a new entrant with a utility mandate suggests this branch may be entering a growth phase. The intersection of SOFC thermal management with grid dispatch, islanding control, and demand-response protocols is sparsely covered and has clear commercial relevance as utility-scale SOFC deployments increase.
Search this in Eureka →How leaders differ by technology route emphasis
Route coverage across the main technology branches in the current evidence set.
| Player | H01M 8 · Batteries, cells & fuel cells | C01B 3 · Non-metallic elements & inorganic compounds | H02J 3 · Power supply & grid systems | B60L 11 · Electric vehicle propulsion | B60L 50 · Electric vehicle propulsion |
|---|---|---|---|---|---|
| Nissan Motor Co Ltd | Strong · 76 | Emerging · 10 | Absent | Emerging · 11 | Emerging · 6 |
| TOTO Ltd | Strong · 40 | Emerging · 3 | Absent | Absent | Absent |
| Mitsubishi Power Ltd | Strong · 19 | Absent | Absent | Absent | Absent |
| Huazhong University of Science and Technology | Strong · 18 | Absent | Emerging · 1 | Absent | Absent |
| Tokyo Gas Co Ltd | Strong · 18 | Absent | Absent | Absent | Absent |
| Panasonic Holdings Corp | Strong · 11 | Strong · 6 | Absent | Absent | Absent |
| Kyocera Corp | Strong · 15 | Absent | Absent | Absent | Absent |
Frequently asked questions
The corpus covers 155 patent families in scope. The applicant ranking and branch counts are reported at the patent-record level, so those figures can exceed the family total.
Nissan Motor Co Ltd leads with 76 patent records, more than double the second-ranked TOTO Ltd at 35 patent records. Their focus is primarily in core fuel-cell engineering (H01M 8) with secondary coverage in electric-vehicle propulsion (B60L) and reforming chemistry (C01B).
The field is classified as Growth stage. The recent three-year filing window sits 110% above the prior three-year window, indicating multi-year expansion. Annual volume has eased from its 2018 peak, and the most recent years (2024–2026) are further understated by publication lag.
China is the lead jurisdiction with 128 patent records, followed by Europe (EPO) with 69, Japan with 64, and the United States with 60. WIPO/PCT filings stand at 20. Teams targeting export markets should prioritize EPO and US prosecution alongside Chinese filings.
The most active co-filing relationship is TOTO Ltd and Panasonic Holdings Corp with 5 jointly filed records. TOTO also co-files with Hitachi Ltd (2 records), and Tokyo Gas co-files with Kyocera Corp (2 records). Huazhong University of Science and Technology jointly files with its Shenzhen and Ezhou research institutes.
F23N (combustion control) and H02J (power supply and grid systems) are the most notable adjacent branches with sparse filing relative to the H01M core — accounting for 6 and 17 patent records respectively. G05B (control and regulating systems) also holds only 6 patent records despite clear relevance to closed-loop thermal management.
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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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