Alkaline Fuel Cell Patent Landscape 2026
Alkaline Fuel Cell Patent Landscape in 2026
The alkaline fuel cell field has reached maturity, with 2,792 patent families on record and annual filings peaking in 2022 before easing, though the multi-year window still shows positive growth. Kolon Industries leads decisively in filing volume, and the top five filers account for over a quarter of the hundred largest filers’ combined output, signaling a moderately concentrated competitive structure.
Kolon Industries leads a moderately concentrated field
Kolon Industries holds the top position among all applicants by a substantial margin, followed by LG Chem, Nissan Motor, Hydrogenics, and Samsung SDI. These five leaders together represent 26% of the combined patent records filed by the hundred largest applicants, indicating a field with clear front-runners but meaningful secondary participation.
A visible tier gap separates the top two applicants — Kolon Industries and LG Chem — from the third and fourth-ranked players. Below the top five, rankings compress, suggesting a broad mid-tier of active contributors rather than a winner-takes-all dynamic.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Kolon Industries Inc. | 527 | |
| 2 | LG Chem Ltd. | 314 | |
| 3 | Nissan Motor Co., Ltd. | 240 | |
| 4 | Hydrogenics Corporation | 237 | |
| 5 | Samsung SDI Co., Ltd. | 217 | |
| 6 | Robert Bosch GmbH | 163 | |
| 7 | Toyota Motor Corporation | 161 | |
| 8 | Hyundai Motor Company | 160 | |
| 9 | ZTEK Corporation | 157 | |
| 10 | Equos Research Co., Ltd. | 149 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Intelligent Energy Inc. | 144 | |
| 12 | Samsung Electro-Mechanics Co., Ltd. | 140 | |
| 13 | Daihatsu Motor Co., Ltd. | 133 | |
| 14 | Hewlett Packard Development Company, L.P. | 128 | |
| 15 | NGK Insulators, Ltd. | 120 | |
| 16 | IdaTech LLC | 109 | |
| 17 | Dai Nippon Printing Co., Ltd. | 105 | |
| 18 | Kobe Steel, Ltd. | 100 | |
| 19 | Intelligent Energy Ltd. | 97 | |
| 20 | Sony Group Corporation | 80 |
Kolon Industries’ strong position in membrane and separation technology (H01M 8 and B01D) points to a deliberate stack-level IP strategy, while the diversity of second- and third-tier applicants — spanning automakers, chemical companies, and specialist fuel-cell firms — reflects the technology’s cross-sector relevance.
Patent records published in the most recent 18–24 months are subject to publication lag and likely undercount actual filing activity; trend reads for 2024–2026 should be treated as provisional. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing activity peaked in 2022; cell and membrane technology dominate the mix
Two charts together capture the field’s pace and direction: the annual filing trend reveals a maturing cycle, while the IPC composition shows where technical effort is concentrated and where adjacent branches remain relatively sparse.
Annual filing trend
Annual filing volume climbed from 326 records in 2017 to a peak of 559 in 2022, then eased to 390 in 2023. Figures for 2024 onward reflect publication lag and should not be read as a real decline; the multi-year window still shows 22% growth.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H01M (batteries, cells, and fuel cells) dominates the IPC mix by a wide margin. The next largest branches — C01B (non-metallic elements and inorganic compounds), C25B (electrolytic production), and B01J (catalysis) — each represent a much smaller share, pointing to concentrated core activity with sparser adjacent coverage.
↗ 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.
Water treatment system using alkaline water electr…
Provided is a water treatment system using an alkaline water electrolytic device and an alkaline fuel cell in which for continuing an electrolytic treatment, a hydrogen gas and an oxygen gas required in an alkaline water electrolytic device and an alkaline fuel cell, an amount of water corresponding to raw water lost through the electrolytic treatment, and… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Thermally enhanced compact reformer | 309 |
| 2 | Zero/low emission and co-production energy supply … | 240 |
| 3 | Portable chemical hydrogen hydride system | 237 |
| 4 | Portable chemical hydrogen hydride system | 235 |
| 5 | Fuel cell stack compression systems, and fuel cell… | 230 |
| 6 | Electrochemical Energy Storage Systems and Methods | 218 |
| 7 | Plasmatron-fuel cell system for generating electri… | 216 |
| 8 | Process and installation for the combined generati… | 198 |
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 field’s structure means for R&D investment decisions
Four structural dimensions — maturity stage, competitive concentration, collaboration networks, and geographic reach — frame where new entrants and incumbents face headwinds or openings.
Field has plateaued near its 2022 peak
The lifecycle evidence places alkaline fuel cells at the Maturity stage: annual filings have eased from the 2022 peak of 559 records, though the multi-year window reflects 22% growth. New entrants face a densely populated core technology space (H01M) and will find incremental differentiation harder to achieve through cell architecture alone. Adjacent branches offer more room.
Maturity stageModerate concentration with a clear leader
The top five filers account for 26% of the hundred largest applicants’ combined patent records, and the gap between Kolon Industries (527 records) and the fifth-ranked Samsung SDI (217 records) is substantial. The mid-tier is broad, spanning automakers, chemical companies, and specialists, which means competitive pressure comes from multiple directions rather than a single dominant axis.
Moderate concentrationCross-sector co-filing is active and clustered
Hydrogenics and Cummins are the most active co-filing pair with 48 joint records, followed closely by Nissan Motor and AVL List with 43. LG Chem co-files with LG Electronics (23 records) and with DGIST (11 records), reflecting intra-group and industry-academia linkages. Kolon Industries co-files with Kia (8 records) and Hyundai Motor (8 records), tying membrane IP directly to automotive deployment partners.
Active co-filingUS leads; Japan, Europe, and China form a strong second tier
The United States is the dominant filing jurisdiction, followed by Japan, Europe (EPO), and China. Germany, Canada, and Australia represent a meaningful third tier. This broad geographic spread reflects the technology’s commercial relevance across energy, automotive, and industrial markets worldwide, and means that freedom-to-operate analysis must extend well beyond a single jurisdiction.
US-led, global reachGo 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 |
|---|---|---|
| Hydrogenics Corporation | Cummins Inc. | 48 |
| Nissan Motor Co., Ltd. | AVL List GmbH | 43 |
| LG Chem Ltd. | LG Electronics Inc. | 23 |
| LG Chem Ltd. | Daegu Gyeongbuk Institute of Science and Technology (DGIST) | 11 |
| Hydrogenics Corporation | Cummins Ltd. | 11 |
| Nissan Motor Co., Ltd. | Nippon Steel & Sumikin Micro Metal Corporation | 9 |
| Kolon Industries Inc. | Kia Corporation | 8 |
| Kolon Industries Inc. | Hyundai Motor Company | 8 |
| Nissan Motor Co., Ltd. | Toyo Tanso Co., Ltd. | 8 |
| Nissan Motor Co., Ltd. | University of Yamanashi | 7 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Kolon Industries anchors the field; Robert Bosch accelerating fast
The leader ranking is shaped by membrane and cell-stack specialization at the top, with automakers and chemical groups filling the challenger tier. Momentum data adds a forward-looking dimension to the static counts.
Kolon Industries
Kolon Industries holds 527 patent records, the largest position in the ranking by a wide margin. Its technology focus is tightly concentrated in H01M 8 (fuel cell systems) and B01D (membrane separation processes), reflecting a deliberate strategy to own the ion-exchange membrane layer critical to alkaline fuel cell performance. Recent-period filings show a +17% trajectory, suggesting the position is still being actively reinforced rather than maintained passively.
527 patent recordsRobert Bosch
Robert Bosch holds 163 patent records and is the fastest-growing among tracked incumbents, with recent filings up +126% versus the prior period. Its technology emphasis spans H01M 8 (fuel cell systems) and C25B (electrolytic production of compounds), indicating a strategy that links fuel cell operation to hydrogen generation — consistent with its broader hydrogen systems ambitions. The sharp momentum jump warrants close monitoring.
163 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Kolon Industries Inc. | 228 | ▲ +17% |
| Nissan Motor Co., Ltd. | 1 | ▲ new entrant |
| Hydrogenics Corporation | 150 | ▲ new entrant |
| NGK Insulators, Ltd. | 8 | ▼ -93% |
| Robert Bosch GmbH | 95 | ▲ +126% |
Under-served branches adjacent to the alkaline fuel cell core
Several IPC branches sit adjacent to the dominant H01M core but carry relatively lower filing share within this corpus. These are observations of relative sparsity; only branches with plausible technical linkage and a realistic entry path are framed as potential opportunities.
C25B · Electrolytic production of compounds
This branch accounts for 6% of the corpus by record count — significant in absolute terms (1,167 records) but sparse relative to H01M given the logical coupling between alkaline electrolysis and fuel cell operation. Robert Bosch and Hydrogenics already have footholds here. The entry path for new players is through electrolyzer-fuel cell integrated system patents, an area where hydrogen production efficiency improvements directly enhance fuel cell value propositions.
Search this in Eureka →B60L · Electric vehicle propulsion
At 289 records and 2% share, B60L is notably sparse for a technology that has been pursued as an automotive power source. The co-filing evidence shows Kolon Industries partnered with Kia and Hyundai Motor, but the branch itself is thin relative to the scale of automotive electrification investment. Teams with alkaline fuel cell stack IP and automotive integration competence face limited direct competition in this adjacency, though PEM fuel cell art in B60L is dense and must be navigated carefully.
Search this in Eureka →How leaders differ by technology route
Strength of each leader across the main technology routes.
| Player | H01M 8 · Batteries, cells & fuel cells | H01M 4 · Batteries, cells & fuel cells | C01B 3 · Non-metallic elements & inorganic compounds | C25B 9 · Electrolytic production of compounds | C25B 1 · Electrolytic production of compounds |
|---|---|---|---|---|---|
| Kolon Industries Inc. | Strong · 527 | Absent | Absent | Absent | Absent |
| LG Chem Ltd. | Strong · 312 | Moderate · 107 | Absent | Absent | Absent |
| Nissan Motor Co., Ltd. | Strong · 234 | Moderate · 78 | Absent | Absent | Absent |
| Hewlett Packard Development Company, L.P. | Strong · 197 | Absent | Moderate · 65 | Absent | Absent |
| Hydrogenics Corporation | Strong · 230 | Absent | Absent | Emerging · 18 | Absent |
| Toyota Motor Corporation | Strong · 152 | Moderate · 71 | Absent | Absent | Absent |
| Robert Bosch GmbH | Strong · 162 | Absent | Absent | Moderate · 36 | Absent |
Frequently asked questions
Kolon Industries leads with 527 patent records, well ahead of the second-ranked LG Chem at 314. The top five applicants — Kolon Industries, LG Chem, Nissan Motor, Hydrogenics, and Samsung SDI — together represent 26% of the combined records filed by the hundred largest applicants.
Annual filing volume reached its highest point in 2022 at 559 patent records. Activity eased to 390 in 2023. Figures for 2024 onward reflect publication lag and should not be interpreted as a sustained decline; the multi-year growth window still shows a 22% increase.
The United States is the leading filing jurisdiction, followed by Japan, Europe (EPO), and China. Germany, Canada, and Australia form a meaningful third tier. The broad geographic spread means freedom-to-operate analysis requires multi-jurisdiction coverage.
H01M (batteries, cells, and fuel cells) is the dominant branch by a wide margin. The next largest branches are C01B (non-metallic elements and inorganic compounds), C25B (electrolytic production of compounds), and B01J (chemical and physical processes and catalysis), each at roughly 6–8% of total records.
Hydrogenics and Cummins are the most active co-filing pair with 48 joint records. Nissan Motor and AVL List follow with 43 joint records. LG Chem co-files with LG Electronics (23 records) and with DGIST (11 records), while Kolon Industries has collaboration ties with both Kia and Hyundai Motor (8 records each).
Among tracked applicants, Robert Bosch shows the strongest momentum with recent filings up 126% versus the prior period. Kolon Industries also continues to grow at +17%. Hydrogenics is recorded as a new entrant in the most recent window with 150 recent records. Note that very large percentage jumps often reflect a small prior base.
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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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