SOEC Green Hydrogen Patent Landscape 2026
The SOEC green hydrogen patent field is highly concentrated, with Bloom Energy Corp and Haldor Topsoe together holding nearly half the 80 families in scope and the top five filers accounting for 81% of output among the hundred largest filers. The field is expanding on a multi-year basis — recent three-year filings are 300% above the prior three-year window — though annual volume has eased from its 2023 peak, with the most recent years further understated by publication lag.
A two-leader field with a steep drop-off to challengers
Bloom Energy Corp leads with 23 patent families, followed immediately by Haldor Topsoe with 22 — the two are virtually tied at the top. The French Commissariat à l’Énergie Atomique et aux Énergies Alternatives ranks third with 16 patent families, creating a recognizable three-entity tier well ahead of the rest.
The top five filers — Bloom Energy, Haldor Topsoe, CEA, Infinium Technology, and Politecnico di Milano — collectively account for 81% of the combined output of the hundred largest filers. Fourth-ranked Infinium Technology and fifth-ranked Politecnico di Milano each hold 4–5 patent families, signalling a sharp tier gap between the top three and everyone below.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Bloom Energy Corp | 23 | |
| 2 | Haldor Topsoe | 22 | |
| 3 | French Alternative Energies and Atomic Energy Commission (CEA) | 16 | |
| 4 | Infinium Technology LLC | 5 | |
| 5 | Politecnico di Milano | 4 | |
| 6 | University of Yamanashi | 4 | |
| 7 | Samsung Electro-Mechanics Co., Ltd. | 2 | |
| 8 | Yantai Aorun Energy Technology Co., Ltd. | 1 | |
| 9 | Honda Motor Co., Ltd. | 1 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 10 | State Power Investment Group Beijing Heavy Combustion Energy Technology Development Co., Ltd. | 1 | |
| 11 | Electric Energy Express Corp | 1 | |
| 12 | Shanghai Power Equipment Research Institute Co., Ltd. | 1 | |
| 13 | Vellore Institute of Technology | 1 | |
| 14 | Santacc Energy Co., Ltd. | 1 | |
| 15 | Hangzhou Boiler Group Co., Ltd. | 1 | |
| 16 | China University of Petroleum (East China) | 1 | |
| 17 | Northwestern University | 1 |
The near-parity between Bloom Energy and Haldor Topsoe at the top suggests active parallel development rather than a single dominant incumbent, which typically increases the pace of citation cross-pollination and accelerates the breadth of claim landscapes for newcomers to navigate.
Filings from approximately 2024 onward are subject to publication lag and are likely under-counted; trend reads for those years 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.
A 2023 filing surge anchors multi-year growth; electrolytic production dominates the technology mix
The annual filing trend and IPC class composition together reveal both the pace of field expansion and where technical emphasis sits — and where adjacent branches remain relatively sparse.
Annual filing trend
Annual filings were modest from 2018 through 2022, with a striking surge to 42 families in 2023 followed by lower figures in 2024 and 2025 that reflect publication lag rather than a real slowdown. The three-year recent window sits 300% above the prior three-year window, confirming genuine multi-year growth. Do not read the post-2023 figures as a sustained decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C25B (electrolytic production of compounds) is the clear dominant class, reflecting the core electrolysis mechanism of SOEC technology. H01M (batteries, cells and fuel cells) is the next largest class, followed by B01D (separation processes), C10G (hydrocarbon oils and refining), C01B (non-metallic elements and inorganic compounds), and C10K (purifying fuel gases) — each representing adjacent process-integration and downstream-product branches with notably smaller 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.
Systems and methods for coupling green hydrogen-ba…
The present disclosure provides system and method for gasification-based fuel synthesis by coupling it with green hydrogen produced using renewable energy, Carnot battery, and Solid- Oxide Electrolyser Cell (SOEC), with CO2 capture during gasification. The system provides an end-to-end solution for round-the-clock green hydrogen production using renewable… (excerpt from the patent abstract)
Open this patent in Eureka →| # | Patent | Citations |
|---|---|---|
| 1 | Method for operating an SOEC-type stack reactor fo… | 53 |
| 2 | Method of startup mode or standby mode operation o… | 38 |
| 3 | Method for high-temperature electrolysis of steam … | 35 |
| 4 | Methods for producing combustible gas from the ele… | 30 |
| 5 | Process for starting mode or stand-by mode operati… | 25 |
| 6 | Steam recycle control | 8 |
| 7 | 基于可逆固体氧化物电池和定日太阳能场的制氢发电及供热系统 | 6 |
| 8 | Solid oxide electrolysis cell, and method and syst… | 4 |
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 patent structure means for R&D investment decisions
Four structural dimensions — maturity, concentration, collaboration, and geography — determine where new entrants face headwinds and where room to differentiate exists.
Growth stage, expanding multi-year, easing from 2023 peak
The field is classified as Growth. Recent three-year filing volume is 300% above the prior three-year window, confirming real expansion. Annual volume has eased from its 2023 peak, and the most recent years are further understated by publication lag — the underlying growth trajectory remains intact rather than reverting.
Growth stageTop three filers hold commanding share; large gap below
Bloom Energy Corp, Haldor Topsoe, and CEA together account for the dominant share of output among the largest filers. Fourth and fifth-ranked applicants hold 4–5 patent families each, a sharp step down. New entrants should map freedom-to-operate carefully around the top three before committing to core electrolysis cell claims.
High concentrationNo co-applicant filings detected in the corpus
The collaboration evidence is pending — no co-applicant patent families were identified in the current corpus. The absence of cross-entity co-filings suggests that the leading players have so far pursued independent IP strategies rather than consortium-style joint development agreements, at least as reflected in patent ownership records.
No co-filings detectedUS-anchored filing base; PCT and EPO provide international reach
The United States leads as the primary filing jurisdiction, followed by WIPO PCT and the European Patent Office. Canada and India are notable secondary markets. China shows limited filing activity despite several Chinese applicants appearing in the corpus, suggesting the global leaders are not yet aggressively protecting in that market — a potential strategic gap for regional players.
US-led, selective globalGo 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.
Co-filing pairs, ranked by the number of jointly-filed patent families.
Bloom Energy and Haldor Topsoe lead by volume; Infinium diverges on downstream routes
The two volume leaders share a near-identical core IPC focus on electrolytic production; Infinium Technology and Politecnico di Milano differentiate by extending into downstream synthesis and gas-purification branches.
Bloom Energy Corp
Bloom Energy Corp holds 23 patent families, the largest single block in the corpus, concentrated squarely in electrolytic production of compounds (C25B1, C25B15, C25B9). Applicant momentum marks it as a new entrant in the recent filing window with 22 recent families, indicating that virtually all of its portfolio has been filed in the latest period — a rapid, focused build-out rather than a legacy position.
patent families: 23Haldor Topsoe
Haldor Topsoe holds 22 patent families and matches Bloom Energy’s core C25B focus while adding a meaningful secondary branch in B01D53 (gas separation processes) — 8 records — distinguishing its portfolio with downstream gas-handling IP. Its momentum is also classified as a new entrant with 14 recent families, reflecting concentrated recent-period activity consistent with its commercialization push in SOEC technology.
patent families: 22| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Bloom Energy Corp | 22 | ▲ new entrant |
| Haldor Topsoe | 14 | ▲ new entrant |
| Infinium Technology LLC | 4 | ▲ new entrant |
| Politecnico di Milano | 4 | ▲ new entrant |
| Samsung Electro-Mechanics Co., Ltd. | 2 | ▲ new entrant |
Under-served adjacent branches in downstream synthesis and gas purification
Several IPC classes adjacent to the dominant C25B electrolysis core show sparse coverage relative to their technical relevance, representing areas where new IP may face less crowding. These are observations of relative sparsity; they become genuine opportunities only where plausible technical value and a realistic entry path align.
C10G · Hydrocarbon oils and synthetic fuel refining
With 11 patent records, C10G covers the catalytic conversion of SOEC-produced syngas into liquid fuels — a key step in power-to-liquid pathways. Infinium Technology has concentrated here, but the broader space remains thin relative to the scale of commercial interest in e-fuels. Entry paths exist for players with Fischer-Tropsch or methanol-synthesis expertise who can couple downstream refining IP to SOEC front-ends.
Search this in Eureka →C10K · Purifying fuel gases from electrolysis streams
C10K (purifying fuel gases) holds only 10 patent records, yet gas-stream purification is a necessary engineering step between the SOEC electrolyzer output and any downstream use of hydrogen or syngas. Haldor Topsoe and Politecnico di Milano have limited filings here, but the branch is largely open. Teams with membrane-separation or pressure-swing-adsorption backgrounds could build differentiated positions without direct conflict with the dominant C25B incumbents.
Search this in Eureka →How leading applicants diverge by IPC technology route
Route coverage across the main technology branches in the current evidence set.
| Player | C25B 1 · Electrolytic production of compounds | C25B 15 · Electrolytic production of compounds | C25B 9 · Electrolytic production of compounds | C25B 3 · Electrolytic production of compounds | H01M 8 · Batteries, cells & fuel cells |
|---|---|---|---|---|---|
| Bloom Energy Corp | Strong · 23 | Strong · 22 | Strong · 19 | Absent | Moderate · 6 |
| French Alternative Energies and Atomic Energy Commission (CEA) | Strong · 15 | Strong · 11 | Strong · 14 | Strong · 16 | Emerging · 3 |
| Haldor Topsoe | Strong · 22 | Strong · 21 | Emerging · 2 | Moderate · 7 | Absent |
| Infinium Technology LLC | Strong · 5 | Strong · 5 | Strong · 5 | Absent | Absent |
| University of Yamanashi | Strong · 4 | Strong · 4 | Moderate · 2 | Absent | Strong · 4 |
| Politecnico di Milano | Strong · 4 | Absent | Absent | Absent | Absent |
Frequently asked questions
The corpus contains 80 patent families in scope, representing a focused and still-growing field rather than a mature, crowded space.
Bloom Energy Corp leads with 23 patent families, virtually tied with Haldor Topsoe at 22. Together they represent the dominant dual-leader structure of the field.
The field is in a Growth stage. Recent three-year filing volume is 300% above the prior three-year window. Annual filings peaked in 2023 at 42 families; figures for 2024 and 2025 are understated by publication lag and should not be read as a real decline.
The United States is the leading filing jurisdiction, followed by WIPO PCT and the European Patent Office. Canada and India are notable secondary markets. China shows limited filing activity from the global leaders despite several Chinese applicants being present in the corpus.
No co-applicant patent families were identified in the current corpus. Leading players appear to be pursuing independent IP strategies rather than joint filings, at least as reflected in patent ownership records.
C10G (hydrocarbon oils and refining) and C10K (purifying fuel gases) each show only 11 and 10 patent records respectively — sparse relative to the dominant C25B core. C01B (non-metallic elements and inorganic compounds) and C07C (acyclic and carbocyclic compounds) are similarly thin, offering potential differentiation for teams with downstream synthesis or gas-processing expertise.
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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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