Anion Exchange Membrane Electrolysis Patent Landscape 2026
Anion Exchange Membrane Electrolysis Patent Landscape in 2026
Anion exchange membrane (AEM) electrolysis is in a confirmed growth phase, with 417 patent families on record and filings expanding 241% over the recent multi-year window. The field remains moderately fragmented — Evoloh Inc leads with 32 patent families, but the top five filers collectively hold only 27% of the top-100 filers’ combined total, leaving meaningful room for new entrants.
Evoloh leads a fragmented, fast-growing field
Evoloh Inc holds the top position with 32 patent families, followed closely by Hanwha Solutions Corp (26), Hydrogenics Corp (21), and a three-way tie among Treadstone Technologies Inc, Robert Bosch GmbH, and Siemens Energy Global GmbH & Co KG at 20 patent families each.
The top five filers account for 27% of the hundred largest filers’ combined total — a moderate concentration level that signals an early-stage competitive race rather than an entrenched oligopoly. The gap between first and fifth place is narrow (32 vs. 20 patent families), reinforcing the view that no single player has built an insurmountable position.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Evoloh Inc | 32 | |
| 2 | Hanwha Solutions Corp | 26 | |
| 3 | Hydrogenics Corp | 21 | |
| 4 | Treadstone Technologies Inc | 20 | |
| 5 | Robert Bosch GmbH | 20 | |
| 6 | SIEMENS ENERGY GLOBAL GMBH & CO KG | 20 | |
| 7 | LAIR LIQUIDE SA POUR LETUDE & LEXPLOITATION DES PR… | 19 | |
| 8 | Ohmium International Inc | 17 | |
| 9 | Tosoh Corp | 17 | |
| 10 | New Hydrogen IP LLC | 15 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | Twelve Benefit Corp | 14 | |
| 12 | KOREA ADVANCED INST OF SCI & TECH | 12 | |
| 13 | Cummins Inc | 12 | |
| 14 | Pocell Tech Ltd | 10 | |
| 15 | Hydrogen Waves Ltd | 9 | |
| 16 | Linde AG | 9 | |
| 17 | Hysata Pty Ltd | 7 | |
| 18 | Ecolectro Inc | 7 | |
| 19 | UOP LLC (Honeywell) | 6 | |
| 20 | IFP Energies Nouvelles | 5 |
The breadth of the leader set — spanning a U. S. startup (Evoloh), a Korean conglomerate (Hanwha Solutions), a legacy electrolyzer maker (Hydrogenics), automotive suppliers (Bosch), and energy infrastructure firms (Siemens Energy, Linde, Air Liquide) — indicates that multiple technology routes and commercialization strategies are being pursued simultaneously.
Filing counts for 2025 and 2026 are understated due to standard patent publication lag; the apparent softening in those years should not be read as a slowdown. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Rapid ramp since 2020, dominated by core electrolytic chemistry
The filing trend and technology composition charts together reveal a field that ignited in 2020 and has been expanding sharply since, concentrated almost entirely in electrolytic production chemistry with a secondary cluster in fuel-cell-adjacent electrochemistry.
Annual filing trend
Annual filings were negligible through 2019, then surged from 28 families in 2020 to a recorded high of 103 in 2024. The 2025 figure of 76 and the 2026 figure of 7 reflect publication lag, not a genuine reversal — the lifecycle evidence confirms annual filings are still rising.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C25B (electrolytic production of compounds) dominates the IPC mix with 433 records, reflecting the core membrane-electrode assembly and cell-stack work. H01M (batteries, cells and fuel cells) is the second branch at 102 records, capturing electrochemical interface overlap. B01J (catalysis), C01B (inorganic compounds), and B01D (separations) each contribute materially, pointing to active work on catalysts, hydrogen purification, and gas-separation integration.
↗ 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.
Gas diffusion layer for anion exchange membrane el…
A gas diffusion layer for anion exchange membrane electrolysis which is hydrophilic and exhibits gas permeability is disclosed. A method for manufacturing the gas diffusion layer for anion exchange membrane electrolysis is disclosed. The gas diffusion layer for anion exchange membrane electrolysis contains a reticular carbon nanofiber film, wherein the… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | System and method for high concentration of multie… | 41 |
| 2 | Bipolar membranes | 35 |
| 3 | System and method for high concentration of multie… | 34 |
| 4 | Bipolar membrane and its production | 34 |
| 5 | Electrochemical system with confined electrolyte | 28 |
| 6 | Electrochemical system with confined electrolyte | 25 |
| 7 | Production of alkali hydroxide | 25 |
| 8 | Systems and methods for ethylene production | 17 |
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 IP structure means for R&D investment decisions
Four structural signals — maturity stage, competitive concentration, collaboration patterns, and geographic filing spread — shape where new entrants and incumbents should focus resources.
Active growth phase; early movers still building positions
The lifecycle evidence classifies this field as Growth, with annual filings still rising and the most recent period understated by publication lag. The 241% multi-year growth rate confirms that AEM electrolysis is past proof-of-concept but well short of saturation. Engineers entering now face rising competition but can still establish foundational positions in sub-areas that remain sparse.
Growth stageFragmented top tier; no dominant incumbent
The top five filers hold 27% of the top-100 filers’ combined total, and the narrowness of the gap between first (32 families) and fifth place (20 families) confirms that leadership is genuinely contested. The mix of startups, conglomerates, and energy majors at the top suggests differentiated technology bets rather than a single converging standard, which leaves technical differentiation as the primary competitive lever.
Fragmented marketIndustry-academia pairing and supply-chain co-filings are the dominant collaboration pattern
The most active co-filing pair is Hanwha Solutions Corp and Korea Advanced Institute of Science and Technology (KAIST), with 12 joint patent families — the largest collaboration in the dataset. Cummins Inc and Ecolectro Inc follow with 9 joint families, reflecting a strategic partnership between an engine-systems major and an AEM membrane specialist. Tosoh Corp has filed jointly with both Toagosei Co Ltd (7 families) and Sagami Chemical Research Institute (2 families), indicating a materials-supply-chain collaboration cluster around Japanese membrane chemistry.
Collaborative ecosystemU.S. leads filing coverage; Europe and PCT routes follow
The United States is the primary filing jurisdiction, followed by Europe (EPO) and WIPO (PCT). Japan, Australia, and India are the next tier. China and Canada each have modest coverage, and South Korea — home to Hanwha and KAIST — has relatively few direct filings, suggesting applicants may be routing protection primarily through PCT and EPO channels. The geographic spread indicates global commercial ambition among the leading filers.
U.S.-led, globally filedGo 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 |
|---|---|---|
| Hanwha Solutions Corp | Korea Advanced Institute of Science and Technology (KAIST) | 12 |
| Ecolectro Inc | Cummins Inc | 9 |
| Tosoh Corp | Toagosei Co Ltd | 7 |
| Tosoh Corp | Sagami Chemical Research Institute | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Evoloh and Hanwha Solutions lead; nearly all top filers are new entrants
Momentum data show that the large majority of top-ranked applicants entered the AEM electrolysis patent space only recently, consistent with the post-2020 filing surge. Air Liquide is the only top filer showing a declining trajectory.
Evoloh Inc
Evoloh holds 32 patent families — the largest portfolio in the dataset — with 23 filed in the recent period, flagged as a new entrant. Its technology focus is concentrated squarely in core C25B electrolytic production sub-classes covering hydrogen evolution, electrode design, and cell-stack architecture. The depth and recency of its portfolio signal a purpose-built AEM electrolysis IP strategy rather than a diversified energy portfolio.
patent families: 32Hanwha Solutions Corp
Hanwha Solutions Corp holds 26 patent families, with 17 in the recent period and a new-entrant momentum flag. Its technical focus mirrors Evoloh’s in the C25B electrolytic production classes, with particularly strong coverage of electrode and membrane-electrode assembly sub-areas. Its 12-family co-filing relationship with KAIST provides an academic research pipeline that few rivals can match among the top-tier players.
patent families: 26| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Evoloh Inc | 23 | ▲ new entrant |
| Hanwha Solutions Corp | 17 | ▲ new entrant |
| Ecolectro Inc | 16 | ▲ new entrant |
| Siemens Energy Global GmbH & Co KG | 20 | ▲ new entrant |
| Robert Bosch GmbH | 17 | ▲ new entrant |
| Air Liquide SA | 9 | ▼ -10% |
| Ohmium International Inc | 16 | ▲ new entrant |
| New Hydrogen IP LLC | 1 | ▲ new entrant |
Under-served branches adjacent to the AEM electrolysis core
Several IPC branches appear at materially lower coverage relative to the dominant C25B core, and two stand out as technically adjacent with plausible entry paths for teams already active in AEM electrolysis.
C23C · Coating and surface deposition
With 24 patent records against 433 in the dominant C25B branch, surface-deposition methods for AEM electrode and bipolar-plate coatings remain sparsely covered. Treadstone Technologies is the clearest signal here — its top IPC sub-class is C23C4 (thermal spray coatings), alongside its C25B cell-stack work — but the broader field has filed little in this direction. Teams with coating process expertise could establish differentiated positions in corrosion-resistant and catalytically active surface treatments for AEM components.
Search this in Eureka →C02F · Water and wastewater treatment
AEM electrolyzers are being evaluated for direct seawater or impure-water electrolysis, yet C02F (water treatment) carries only 27 patent records — roughly 3% of the IPC distribution. The technical value is clear: eliminating or simplifying upstream water-purification requirements would reduce system cost and broaden deployment contexts. The sparse coverage suggests that integrating water-quality management directly into AEM system design is an under-claimed technical area with a realistic entry path for teams combining electrochemistry and process-engineering expertise.
Search this in Eureka →How leading filers differ by technical route
Strength of each leader across the main technology routes.
| Player | C25B 1 · Electrolytic production of compounds | C25B 9 · Electrolytic production of compounds | C25B 15 · Electrolytic production of compounds | C25B 11 · Electrolytic production of compounds | H01M 8 · Batteries, cells & fuel cells |
|---|---|---|---|---|---|
| Evoloh Inc | Strong · 22 | Strong · 17 | Moderate · 11 | Strong · 17 | Absent |
| Hanwha Solutions Corp | Strong · 22 | Moderate · 9 | Absent | Strong · 21 | Absent |
| Robert Bosch GmbH | Strong · 14 | Strong · 14 | Strong · 12 | Absent | Strong · 8 |
| Siemens Energy Global GmbH & Co KG | Strong · 16 | Strong · 14 | Strong · 10 | Moderate · 7 | Absent |
| Treadstone Technologies Inc | Absent | Strong · 18 | Absent | Strong · 15 | Strong · 11 |
| Aquahydrex Inc | Strong · 11 | Strong · 12 | Strong · 11 | Absent | Moderate · 6 |
| New Hydrogen IP LLC | Strong · 12 | Strong · 11 | Strong · 12 | Absent | Moderate · 3 |
Frequently asked questions
The current dataset contains 417 patent families in scope, representing a field that has grown 241% over the recent multi-year window from a near-zero base before 2020.
Evoloh Inc leads with 32 patent families, followed by Hanwha Solutions Corp (26), Hydrogenics Corp (21), and Treadstone Technologies Inc, Robert Bosch GmbH, and Siemens Energy Global GmbH & Co KG at 20 each.
The lifecycle evidence classifies the field as Growth, with annual filings still rising and the 2025–2026 data understated by publication lag. The multi-year growth rate of 241% supports this classification.
The United States leads with 117 patent records filed there, followed by Europe (EPO) at 77 and WIPO (PCT) at 75. Japan (39), Australia (34), and India (29) form the next tier.
Yes. The most active co-filing pair is Hanwha Solutions Corp and KAIST with 12 joint patent families. Cummins Inc and Ecolectro Inc have 9 joint families, and Tosoh Corp has co-filed with Toagosei Co Ltd (7 families) and Sagami Chemical Research Institute (2 families).
The most under-served adjacent branches relative to the dominant C25B core are C23C (coating and surface deposition, 24 records) and C02F (water and wastewater treatment, 27 records). Both are technically relevant to AEM system performance but remain sparsely claimed compared to the core electrolytic chemistry.
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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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