Green Steel / Low-Carbon Steelmaking Patent Landscape
Green Steel / Low-Carbon Steelmaking Patent Landscape in 2026
HYBRIT Development AB commands 127 of the 369 patent families in scope, making green steel one of the most concentrated early-stage technology fields tracked by PatSnap Eureka. The field is still expanding on a multi-year basis, though annual volume has eased from its 2021 peak and the most recent years are further understated by publication lag.
HYBRIT leads a highly concentrated field with a clear first-mover advantage
HYBRIT Development AB sits alone at the top of ElectraSteel Inc and Paul Wurth SA are tied in third place at 28 patent families each.
The top five filers account for 66% of the combined total among the hundred largest filers — an unusually high concentration that reflects HYBRIT’s pioneer position and the relatively recent commercialization wave that began around 2020. Below the top four, there is a pronounced drop to single-digit counts, signalling a thin challenger tier.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | HYBRIT Development AB | 127 | |
| 2 | Technological Resources Pty Ltd | 63 | |
| 3 | ElectraSteel Inc | 28 | |
| 4 | Paul Wurth SA | 28 | |
| 5 | Lifezone Limited (UK) | 10 | |
| 6 | Pathfinder Holding Corp | 7 | |
| 7 | Hertha Metals Inc | 7 | |
| 8 | Tata Steel Nederland Technology BV | 6 | |
| 9 | Loussavaara-Kiirunavaara AB (LKAB) | 5 | |
| 10 | Northeastern University China | 4 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | Fortum Battery Recycling Oy | 4 | |
| 12 | thyssenkrupp Steel Europe AG | 4 | |
| 13 | Plagazi | 4 | |
| 14 | Dongda Nonferrous Solid Waste Technology Research Institute (Liaoning) | 4 | |
| 15 | Active Land International Corp | 4 | |
| 16 | Rodolfo Antonio Gomez | 3 | |
| 17 | HYBRIT Development AB | 3 | |
| 18 | Molten Industries Inc | 3 | |
| 19 | Rodolfo Antonio Gomez | 3 | |
| 20 | Carbelec Pty Ltd | 3 |
HYBRIT’s scale and trajectory imply that hydrogen-based direct reduction is being locked up rapidly at the patent level. Challengers building positions in electrochemical or alternative reduction routes face a narrower window before key process patents mature into enforceable blocks.
Filing counts for 2024 and 2025 are understated due to the standard 18-month publication lag; apparent softening in those years should not be interpreted as a real slowdown. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A sharp post-2020 surge concentrated in iron production chemistry, with electrochemical routes emerging
The annual filing trend reveals a field that was dormant before 2020 and then surged to a 2021 peak, while the technology composition shows that iron production chemistry dominates but electrochemical and furnace-engineering branches are gaining relative weight.
Annual filing trend
Zero activity appears through 2019, followed by 103 filings in 2021 — the single largest year on record — then a gradual step-down to 96 in 2022, 68 in 2023, and 65 in 2024. The 2025 and 2026 figures (26 and 6 respectively) are substantially understated by publication lag and should not be read as real declines. The field is expanding on a multi-year basis, with recent three-year filings sitting 112% above the prior three-year window.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C21B (iron production / blast furnace chemistry) dominates with 328 records, reflecting the centrality of hydrogen direct reduction. C22B (metal extraction and refining) follows at 155 records. C25B (electrolytic production of compounds) at 72 records and the two furnace classes F27B and F27D (63 and 61 records respectively) are the next largest clusters, indicating growing activity in electrochemical pathways and reactor engineering alongside the core reduction 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.
SYSTEM UND VERFAHREN ZUR HERSTELLUNG VON GRÜNEM ST…
The present invention relates to a method (150) and a system (200) for producing green steel (600). The method (150) includes the scrap (201) which is obtained from one or more sources of scrap (700). The obtained scrap and ferroalloys are charged into an induction furnace (203) and melted (103) in an inert environment to obtain molten steel (204). The… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | 用焦炉煤气生产直接还原铁短流程工艺 | 28 |
| 2 | 一种氢气炼铁的方法及装置 | 20 |
| 3 | Process for the production of carburized sponge iron | 17 |
| 4 | Process for the production of sponge iron | 14 |
| 5 | Iron conversion system and applications | 13 |
| 6 | Sustainable process for the co-generation of pig i… | 13 |
| 7 | Process for the Production of Carburized Sponge Iron | 9 |
| 8 | High Temperature Reactor System and Method for Pro… | 9 |
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.
What the patent structure means for R&D investment decisions
The concentration of families, the recency of the growth wave, and the absence of recorded co-filing activity each carry distinct implications for teams evaluating entry or partnership strategies.
Growth stage — multi-year expansion with annual volume easing from the 2021 peak
The lifecycle evidence classifies the field as Growth: three-year recent filings are 112% above the prior window, confirming sustained expansion. However, annual volume peaked in 2021 and has stepped down since, so the growth rate is decelerating even as the absolute base continues to rise. Teams entering now face an active but not yet saturated IP environment.
Growth stageTop-heavy field with a thin challenger tier
The top five filers hold 66% of the combined total among the hundred largest filers. HYBRIT alone accounts for a disproportionate share, leaving ElectraSteel, Paul Wurth, Technological Resources, and Lifezone Limited as the only other meaningful holders. Below rank five, counts fall to single digits, meaning most entrants are at very early filing stages and have not yet built defensive depth.
High concentrationNo recorded co-applicant filings in scope
The collaboration evidence shows no co-applicant filings in the current corpus. This is notable given the capital intensity of green steel projects, where joint ventures and consortium-based R&D are common commercially. The absence may reflect early-stage IP siloing or that consortium IP is held by single designated entities rather than multiple co-filers. It represents a gap worth monitoring as demonstration projects mature.
No co-filings recordedEurope leads filing activity; PCT and US represent the primary international protection routes
Europe (EPO) leads with 62 records, followed by WIPO PCT at 58 and the United States at 50. China ranks fourth at 46, with Australia fifth at 35 — reflecting the presence of iron-ore-focused filers such as Technological Resources Pty Ltd. Sweden (24 records) is notable as HYBRIT’s home jurisdiction. India (14 records) and Germany (9 records) round out the meaningful national offices, while Japan has only 3 records, suggesting limited filing priority there to date.
EPO / PCT / US / CNGo 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.
HYBRIT dominates hydrogen-DRI; ElectraSteel is the fastest-rising electrochemical challenger
Two sharply contrasting profiles define the current competitive structure: HYBRIT’s scale in hydrogen-based iron production versus ElectraSteel’s rapid entry via electrochemical metal extraction routes.
HYBRIT Development AB
HYBRIT holds 127 patent families — the largest position in scope by a wide margin. Its technology focus is concentrated in C21B 13 (hydrogen-based iron production, 125 records), supplemented by C25B 1 (electrolytic production, 43 records) and F27B 1 (furnace engineering, 24 records), indicating a broad process-system claim strategy. Momentum is strong: recent filings are up 62% versus the prior period, showing continued active prosecution.
127 patent familiesElectraSteel Inc
ElectraSteel holds 28 patent families and enters the ranking as a new entrant in the recent period, making it the fastest-growing filer by trajectory. Its focus is distinctly electrochemical — C22B 3 (metal extraction, 19 records), C25C 1 (electrolytic metal production, 18 records), and C22B 5 (refining, 13 records) — positioning it in a different technical corridor from HYBRIT’s hydrogen-DRI approach and reducing direct overlap risk.
28 patent families| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| HYBRIT Development AB | 76 | ▲ +62% |
| Technological Resources Pty Ltd | 26 | ▼ -24% |
| Paul Wurth SA | 14 | ▬ 0% |
| ElectraSteel Inc | 27 | ▲ new entrant |
| Lifezone Limited (UK) | 9 | ▲ new entrant |
| Hertha Metals Inc | 4 | ▲ new entrant |
| Pathfinder Holding Corp | 7 | ▲ new entrant |
| Tata Steel Nederland Technology BV | 5 | ▲ new entrant |
Electrochemical routes and steelmaking process control are under-served relative to iron-reduction chemistry
While C21B dominates the corpus, several adjacent IPC branches carry meaningful technical relevance to green steel but remain sparsely covered relative to the overall filing volume, suggesting room for differentiated positioning.
C25B · Electrolytic production of compounds
With 72 records and an 8% share of IPC branch coverage, C25B is the largest of the adjacent clusters but remains thin compared to C21B’s 328 records. Electrolytic hydrogen production is a direct feedstock enabler for hydrogen-DRI, and electrolytic ironmaking itself is an alternative decarbonisation route pursued by ElectraSteel. Teams with electrolyser or membrane expertise have a plausible entry path here that does not require competing head-on with HYBRIT’s DRI portfolio.
Search this in Eureka →C21C · Steelmaking (electric arc, converter, ladle processes)
C21C holds 51 records and a 6% branch share — surprisingly low given that steelmaking conversion is the downstream step in every green steel process chain. The most-cited patents in scope include sponge iron carburisation and direct reduction processes, but converter and electric-arc furnace control tailored to DRI feedstocks is sparsely filed. Process engineers focused on EAF optimisation for high-hydrogen-DRI charge mixes could find differentiated claim space here.
Search this in Eureka →How the leading filers differ by technology route
Strength of each leader across the main technology routes.
| Player | C21B 13 · Iron production (blast furnace) | C22B 5 · Metal extraction & refining | C25B 1 · Electrolytic production of compounds | C22B 1 · Metal extraction & refining | C22B 3 · Metal extraction & refining |
|---|---|---|---|---|---|
| HYBRIT Development AB | Strong · 125 | Emerging · 11 | Moderate · 43 | Emerging · 15 | Absent |
| Technological Resources Pty Ltd | Strong · 58 | Strong · 40 | Absent | Moderate · 14 | Absent |
| ElectraSteel Inc | Strong · 10 | Strong · 13 | Moderate · 6 | Absent | Strong · 19 |
| Paul Wurth SA | Strong · 28 | Absent | Absent | Absent | Absent |
| Lifezone Limited (UK) | Absent | Absent | Absent | Absent | Strong · 10 |
| Pathfinder Holding Corp | Strong · 7 | Absent | Moderate · 2 | Absent | Absent |
| Tata Steel Nederland Technology BV | Strong · 6 | Absent | Absent | Absent | Absent |
Frequently asked questions
The current corpus contains 369 patent families in scope across the green steel and low-carbon steelmaking technology space.
HYBRIT Development AB leads with 127 patent families, nearly double the second-ranked Technological Resources Pty Ltd at 63 patent families. HYBRIT’s portfolio is focused on hydrogen-based direct reduction (C21B 13) and spans complementary electrolyser and furnace engineering classes.
Filing activity was effectively zero through 2019, then surged sharply to 103 filings in 2021. The annual count has stepped down since — 96 in 2022, 68 in 2023, 65 in 2024 — though multi-year recent filings remain 112% above the prior window, confirming the field is still in a growth phase. Figures for 2025 and 2026 are understated by publication lag.
Europe (EPO) leads with 62 records, followed by WIPO PCT at 58 and the United States at 50. China ranks fourth at 46 and Australia fifth at 35. Sweden, as HYBRIT’s home jurisdiction, accounts for 24 records. Japan has only 3 records, indicating limited priority filing there to date.
C21B (iron production chemistry, including hydrogen direct reduction) dominates with 328 records. C22B (metal extraction and refining) follows at 155 records. The most under-served relative to technical importance are C25B (electrolytic compound production, 72 records) and C21C (steelmaking conversion processes, 51 records), both of which are integral to full green steel process chains but have sparse dedicated filing.
The current evidence shows no co-applicant filings recorded in the corpus. Despite the capital-intensive, consortium-driven nature of green steel commercialisation projects, patent positions appear to be held by single entities rather than co-filed across partners — a pattern worth re-examining as demonstration projects mature to industrial scale.
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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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