Hydrogen Metallurgy Patents: Who Leads, Where the Gaps Are 2026
- 68.0% of all 97 records sit with just five assignees, so most of the field's claim space is already staked out at the top rather than spread thin.
- Filings peaked in 2021 at 28 then fell to 10 by 2024, a -64% swing that predates the usual 18-month publication lag on the most recent years.
- C21B iron-production claims cover 75.3% of records while catalysis (B01J) and steelmaking (C21C) each sit under 10%, marking the two most under-claimed adjacent branches.
Filing growth compares 2021 (28 records) with 2024 (10) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 97 records in scope (CR5), not by the ranked leaders only.
What the hydrogen metallurgy patent record actually shows
Hydrogen metallurgy covers the substitution of hydrogen for carbon-based reductants in iron and steel production, along with the electrolytic and catalytic hardware needed to supply that hydrogen at process scale. The 97 records in scope run from 2015 through the 2026 cut-off and cluster heavily around direct reduction of iron ore and the electrolytic cells that feed it, rather than downstream steelmaking itself. Publication lag means the last one to two years understate real filing activity — a document filed in late 2024 may not publish until well into 2026.
Reading the ranking and the IPC composition together tells a specific story: a small group of assignees hold most of the documented iron-production and electrolysis claims, while the furnace hardware and catalyst classes that sit downstream of those core claims remain comparatively open. That gap is where a newcomer's freedom to operate is widest.
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Filing trend and technology composition
Two views of the same 97 records: how filing activity has moved year over year, and which IPC subclasses carry the claims.
Filing trend, 2017–2026
Filings rose from zero in 2017 to a peak of 28 in 2021, then declined to 10 by 2024 — a -64% move over that span. 2025 and 2026 figures are still filling in under the normal publication lag and should not be read as a continued decline.
IPC subclass composition
C21B (iron production via blast furnace and direct reduction routes) appears in 75.3% of the 97 records, far ahead of C25B electrolytic production at 38.1% and C22B metal extraction/refining at 22.7%. Furnace hardware (F27B, F27D) and catalysis (B01J) each sit under 15%, and steelmaking proper (C21C) at 9.3% — these are the classes carrying the fewest claims relative to the core reduction technology.
Shares are the percentage of the 97 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Hydrogen Metallurgy Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about hydrogen metallurgy patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative recent filing
Multi-scale coordinated control method of integrated energy system for green hydrogen metallurgy
Filed by Beijing Jiaotong University, this application addresses the control-system layer of hydrogen metallurgy rather than the reduction chemistry itself: coordinating flexible, adjustable resources across an integrated energy system at multiple timescales, including the time-delay effects in multi-energy and mass transfer between subsystems.Abstract truncated; full text available via the linked record.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2022197954A1 | Carbon capture using electrochemically-produced acid and base | 15 |
| 2 | WO2021183022A1 | Process for the production of sponge iron | 14 |
| 3 | WO2022129515A1 | Smart hydrogen production for DRI making | 8 |
| 4 | EP4032991A1 | Smart hydrogen production for DRI making | 7 |
| 5 | WO2022271065A1 | Hydrogen gas recycling in a direct reduction process | 5 |
| 6 | US20240141510A1 | Carbon Capture Using Electrochemically-Produced Acid and Base | 5 |
| 7 | WO2024064061A1 | Electrochemical metallurgical SLAG recycling | 4 |
| 8 | US20240026476A1 | Method and apparatus for metals, alloys, mattes, or enriched and cleaned slags production from predominantly … | 4 |
| 9 | WO2022271064A1 | A process and a system for the production of sponge iron from iron ore | 4 |
| 10 | CN212293639U | 一种氢冶金装置 | 4 |
Citation counts favour older documents simply because they have had more time to accumulate citations within this corpus — treat them as a signal of influence on the field, not of current commercial importance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing or licensing decision
Three read-throughs of the concentration, trend and citation data, aimed at where a filing or freedom-to-operate decision would actually land.
The top of the field is already crowded
With 66 of 97 records held by five assignees, and 81 of 97 (83.5%) held by ten, most of the documented direct-reduction and electrolysis claim space is staked. A new entrant filing squarely in C21B core reduction chemistry is filing into dense prior art, not open ground.
Filing activity has cooled from its 2021 peak
The -64% move from 28 filings in 2021 to 10 in 2024 is a real decline over a complete window, not an artefact of publication lag. It suggests the initial land-rush into core hydrogen reduction claims has slowed, though 2025-26 figures are too new to read either way.
Reduction chemistry dominates; steelmaking claims are thin
C21B iron production touches 75.3% of records, but C21C steelmaking proper sits at just 9.3% and B01J catalysis at 9.3%. That gap between the reduction step and what happens to the metal afterward is where claim density drops off sharply.
Influence skews toward earlier filings
The most-cited records in this corpus date from the earlier part of the window, which is expected: citation counts accumulate over time and understate the influence of anything filed in the last two to three years.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hydrogen metallurgy patent landscape, with the prior art for and against each one.
Who holds the claims, and where the field is still open
The ranking spans 32 companies, with a steep drop from the leader to the rest — the leader holds 24 records against 4 at fifth place and 3 at tenth.
One assignee holds a quarter of the field
The leading assignee's 24 records is more than double the count at fifth place, indicating a single organisation has built a substantially deeper portfolio than any other filer in scope.
A steep fall from first to fifth place
By fifth place, holdings drop to 4 records — a sharp gradient that separates a handful of committed filers from a long tail of single- or few-filing entrants.
Ten assignees account for most activity
The top 10 combined hold 81 of 97 records (83.5%), leaving relatively little documented activity spread across the remaining ranked assignees — collaboration signals in the dataset are also sparse, with only 3 co-assignee pairs identified.
| Assignee | Recent year | YoY |
|---|---|---|
| Hydrogen Breakthrough Ironmaking Technology Development Company | 0 | — |
| Electra Steel Inc. | 0 | -100% |
| Paul Wurth SA | 0 | — |
| Hertha Metals Inc. | 0 | -100% |
| NewSouth Innovations Pty Ltd | 0 | — |
| Xi'an Jiaotong University | 0 | -100% |
| Tsinghua University | 0 | -100% |
| Changli Xingguo Precision Parts Co., Ltd. | 0 | — |
Where to take this from here
The dataset points to a field with a concentrated top and a thinning tail — the next steps depend on whether you are filing, licensing, or scouting for freedom to operate.
Check freedom to operate in the thin classes
Catalysis, furnace hardware and steelmaking-stage integration carry far fewer documented claims than core iron-production chemistry, making them the more realistic entry points for a first filing.
Explore white space in Eureka →Track the leader's next moves
With one assignee holding 24 of 97 records, monitoring that portfolio's recent filings is a more efficient early-warning signal than scanning the field broadly.
Set up assignee monitoring in Eureka →Re-run the trend once 2025-26 fills in
The 2021-2024 decline is real, but the most recent two years are still incomplete under normal publication lag; revisit the filing trend once those years mature.
Get alerted to trend updates in Eureka →Common questions on hydrogen metallurgy patents
The assignee ranking covers 32 companies, with the leading assignee holding 24 of the 97 records in scope and the top 5 combined accounting for 68.0% of all records. Holdings drop off steeply after the leader — fifth place holds only 4 records and tenth place 3 — so the field has a concentrated top and a long tail of smaller filers. Anyone assessing competitive position should look at the ranked leaders as a group rather than assuming a single dominant player controls the whole space.
Yes, relative to the rest of the field: C21B, the IPC subclass covering iron production including direct reduction and blast-furnace routes, appears in 75.3% of the 97 records in scope, making it by far the densest claim area. Electrolytic production (C25B) is the next most covered at 38.1%. That density means a new filer targeting core direct-reduction chemistry is likely to run into prior art quickly, whereas downstream classes like steelmaking (C21C, 9.3%) and catalysis (B01J, 9.3%) are comparatively open.
Filings peaked at 28 in 2021 and fell to 10 by 2024, a documented -64% decline over that three-year span. This is a genuine slowdown in filing activity within a complete, comparable window, not a data artefact. It likely reflects an initial wave of filings around core direct-reduction and electrolysis concepts settling once the leading positions were staked out, though it does not necessarily mean commercial interest in the technology itself has cooled.
The clearest gaps sit in classes adjacent to the dominant C21B iron-production cluster: catalyst formulations for direct-reduction reactors, furnace thermal-recovery and accessory hardware (F27D), steelmaking-stage hydrogen integration (C21C), and gas-purity or electrochemical-cell control tuned to variable renewable power input. Each of these appears in under 15% of the 97 records, well below the 75.3% coverage of core reduction chemistry, suggesting less-crowded claim space for a first filing.
Publication typically lags filing by roughly 18 months, so the 2025 and 2026 figures in this dataset are structurally incomplete and will rise as more applications publish. The 2021-2024 window is the most recent period that can be treated as complete, and it shows a real -64% decline in filings. Any claim about the trend continuing to fall through 2025-26 would be premature; that read should wait until those years mature.
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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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.