Green Ammonia Synthesis Patent Landscape 2026
Green Ammonia Synthesis Patent Landscape in 2026
The green ammonia synthesis patent space is moderately concentrated, with Haldor Topsoe leading by a clear margin and the top five filers collectively holding 39% of filings among the hundred largest filers. The field is still expanding on a multi-year basis, though annual volume has eased from its 2022 peak, and electrochemical synthesis routes are rapidly gaining ground alongside conventional catalytic processes.
Haldor Topsoe leads a moderately concentrated field
Haldor Topsoe holds the top position with 124 patent families, nearly 30% more than second-ranked Casale SA at 96. The top five filers — Haldor Topsoe, Casale, Air Products & Chemicals, ThyssenKrupp Uhde, and ThyssenKrupp AG — together account for 39% of the combined output of the hundred largest filers, signaling meaningful but not overwhelming concentration.
A clear tier gap separates the top two from the rest of the ranking. Air Products & Chemicals, ThyssenKrupp Uhde, and ThyssenKrupp AG each sit in the 30–36 patent-family range, while Monash University and Nuovo Pignone Tech follow closely at 30 and 29 respectively. Below rank six, counts drop sharply toward the mid-teens, indicating a long tail of smaller players and academic entrants.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Haldor Topsoe AS | 124 | |
| 2 | Casale SA | 96 | |
| 3 | AIR PROD & CHEM INC | 36 | |
| 4 | ThyssenKrupp Uhde GmbH | 32 | |
| 5 | ThyssenKrupp AG | 30 | |
| 6 | Monash University | 30 | |
| 7 | Nuovo Pignone Tech SRL | 29 | |
| 8 | Linde AG | 16 | |
| 9 | Koloma Inc | 14 | |
| 10 | Tecmerra Methane Solutions Inc | 13 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | University of Guelph | 12 | |
| 12 | FuelPositive Corp | 12 | |
| 13 | Ariel Scientific Innovations Ltd | 12 | |
| 14 | KELLOGG BROWN & ROOT INC | 11 | |
| 15 | Pine Tree Partners LLC | 10 | |
| 16 | Naemsaedduk Co Ltd | 10 | |
| 17 | Xi’an Thermal Power Research Institute Co Ltd | 9 | |
| 18 | SIEMENS ENERGY GLOBAL GMBH & CO KG | 8 | |
| 19 | California Institute of Technology | 8 | |
| 20 | Fuzhou University | 8 |
The dominance of established industrial-gas and process-engineering firms — Haldor Topsoe, Casale, Air Products, and the ThyssenKrupp entities — reflects deep IP moats in conventional Haber-Bosch loop optimization. Their strong recent momentum (Haldor Topsoe at 4.2× vs. prior three-year window; Casale at +142%) signals active extension of those positions into green variants rather than ceding ground to newcomers.
Filings from 2025 and 2026 are materially undercounted due to standard patent publication lag; any apparent softening in those years should not be read as a reversal of the multi-year expansion. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Rapid multi-year expansion with electrochemical routes reshaping the technology mix
Filing volume surged from 13 patent families in 2017 to a peak of 234 in 2022, representing a 252% uplift over the recent three-year window versus the prior comparable period. The technology composition shows a field that has evolved well beyond conventional ammonia chemistry into electrolytic synthesis and hydrogen-generation processes.
Annual filing trend
The trend line shows a steep climb from 2017 through 2022, confirming the Growth lifecycle stage. The 2022 peak at 234 patent families is followed by a moderate step-down through 2023–2024; figures for 2025 and 2026 are heavily affected by publication lag and should not be interpreted as a sustained decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C01C (Ammonia, cyanides & nitrogen compounds) is the dominant branch, reflecting core synthesis chemistry. C25B (Electrolytic production of compounds) is the second-largest branch, underscoring the strategic shift toward electrochemical and water-electrolysis-coupled routes. B01J (Chemical/physical processes & catalysis) and C01B (Non-metallic elements & inorganic compounds, including hydrogen) round out the top four, confirming that catalyst innovation and green hydrogen supply are integral to the technology stack.
↗ 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.
Catalyst for electrochemical ammonia synthesis and…
ABSTRACT OF THE DISCLOSURE A catalyst for electrochemical ammonia synthesis incudes a carbon carrier composed of carbon; and 20-65 wt% of iron, copper and sulfur, based on weight of the carbon, supported in the carbon carrier. The catalyst may be coated on an electrode selected from the group consisting of carbon paper, carbon cloth, carbon felt, fluorine-… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Energy conversion system | 78 |
| 2 | Ammonia cracking for hydrogen production | 47 |
| 3 | 一种高效吹脱与尾气氨资源化氨氮废水闭路处理集成工艺 | 42 |
| 4 | Ammonia cracking for green hydrogen | 35 |
| 5 | Control of an ammonia synthesis loop at partial load | 34 |
| 6 | Control of an ammonia synthesis loop at partial load | 29 |
| 7 | Methods and apparatus for producing ammonia in a w… | 28 |
| 8 | Electrochemical synthesis of ammonia | 28 |
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 combination of a Growth lifecycle, a moderate concentration profile, and fast-rising electrochemical filing activity creates a differentiated set of entry and expansion signals for engineering teams.
Growth stage: multi-year expansion intact, peak volume passed
The field carries a Growth lifecycle designation: the recent three-year filing window sits 252% above the prior comparable window, confirming sustained expansion. However, annual volume peaked in 2022 at 234 patent families and has eased since. Teams entering now face an active but not yet saturated space, with electrochemical routes still in rapid development relative to conventional catalytic loops.
Growth · 2022 peakTop-two gap creates a defined moat; mid-tier is accessible
Haldor Topsoe (124 patent families) and Casale SA (96) sit well above the next cluster of firms in the 30–36 range. The top five filers represent 39% of the hundred largest filers’ combined output. The mid-tier — Air Products, ThyssenKrupp entities, Monash, Nuovo Pignone — is close enough in count that a focused filing program could move an entrant into a meaningful position within two to three years.
Moderate concentrationThyssenKrupp internal co-filing and an SME–university pair dominate co-applicant activity
The most active collaboration pair is ThyssenKrupp AG and ThyssenKrupp Uhde GmbH (27 joint filings), reflecting coordinated internal IP strategy across the ThyssenKrupp group. The second-most active pair is Tecmerra Methane Solutions and the University of Guelph (13 joint filings), a direct SME–academic partnership. ThyssenKrupp AG and ThyssenKrupp Industrial Solutions share a further 3 joint filings. Outside these pairs, co-applicant activity is sparse, suggesting the ecosystem has not yet coalesced around broad multi-party consortia.
Intra-group + SME–academicChina leads filing volume; US, PCT, and EPO form the core protection quartet
China is the leading jurisdiction by patent records, followed by the United States, WIPO (PCT), and the European Patent Office. Australia, Canada, and India each show notable filing counts, consistent with the role of resource-rich and energy-transition-focused markets. Filing activity in the UAE, Germany, South Korea, and Chile reflects commercial interest in green ammonia export corridors and industrial hubs.
China-led; broad global spreadGo 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 |
|---|---|---|
| ThyssenKrupp AG | ThyssenKrupp Uhde GmbH | 27 |
| Tecmerra Methane Solutions Inc | University of Guelph | 13 |
| ThyssenKrupp AG | ThyssenKrupp Industrial Solutions AG | 3 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Haldor Topsoe and Casale SA lead; industrial-gas and engineering firms dominate the top tier
The two leading applicants together hold over 220 patent families and are both accelerating. Below them, a cluster of engineering contractors and one academic institution compete for the mid-tier positions.
Haldor Topsoe AS
Haldor Topsoe holds 124 patent families, the largest portfolio in the corpus, and is filing at 4.2× its prior three-year rate — the strongest momentum of any top applicant. Its technology emphasis spans core ammonia chemistry (C01C), hydrogen-generation processes (C01B), and electrolytic production (C25B), indicating a broad strategy that covers both optimized Haber-Bosch and emerging electrochemical routes.
patent families: 124Casale SA
Casale SA holds 96 patent families and has grown at +142% versus the prior three-year window, the second-highest momentum among ranked applicants. Its portfolio concentrates on ammonia synthesis chemistry (C01C) and electrolytic production (C25B), with a secondary position in nitrogen compound processing (C01B). Casale’s filing pace suggests it is actively narrowing the gap with Topsoe and expanding into green routes.
patent families: 96| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Haldor Topsoe AS | 88 | ▲ 4.2× vs prior 3-yr |
| Casale SA | 63 | ▲ +142% |
| Air Products and Chemicals Inc | 18 | ▲ +6% |
| Monash University | 3 | ▼ -73% |
| ThyssenKrupp AG | 22 | ▲ new entrant |
| Nuovo Pignone Tech SRL | 25 | ▲ new entrant |
| ThyssenKrupp Uhde GmbH | 22 | ▲ new entrant |
Under-served adjacent branches worth monitoring
Several IPC branches with plausible technical relevance to green ammonia appear at low filing densities relative to the dominant C01C and C25B classes, suggesting areas where coverage is comparatively sparse.
F25J · Gas liquefaction & separation
F25J holds only 64 patent records and a 2% share of the corpus, yet gas separation and liquefaction are operationally critical for green ammonia export supply chains — particularly cryogenic ammonia storage and nitrogen separation upstream of synthesis loops. Linde AG’s portfolio already shows a concentration in F25J (12 records), but the branch remains thin relative to the engineering challenge. Teams focused on integrated liquefaction-and-transport system IP may find entry paths here with limited direct competition from the top two players.
Search this in Eureka →H01M · Batteries, cells & fuel cells
H01M appears at 55 patent records and a 2% share, covering the fuel-cell and electrochemical-cell interfaces relevant to ammonia-to-power reconversion and to electrolyzer stack design. Monash University’s portfolio shows the strongest electrochemical focus (C25B dominant), but H01M-specific coverage is sparse across the top applicants. As ammonia is increasingly considered a hydrogen carrier for fuel-cell applications, the intersection of ammonia cracking and fuel-cell integration represents a technically coherent but currently under-patented adjacency.
Search this in Eureka →How leaders differ by technology route
Strength of each leader across the main technology routes.
| Player | C01C 1 · Ammonia, cyanides & nitrogen compounds | C25B 1 · Electrolytic production of compounds | C01B 3 · Non-metallic elements & inorganic compounds | C25B 9 · Electrolytic production of compounds | B01J 23 · Chemical/physical processes & catalysis |
|---|---|---|---|---|---|
| Haldor Topsoe AS | Strong · 124 | Moderate · 38 | Moderate · 44 | Absent | Absent |
| Casale SA | Strong · 95 | Moderate · 43 | Emerging · 4 | Absent | Emerging · 5 |
| Monash University | Strong · 25 | Strong · 31 | Absent | Strong · 21 | Moderate · 12 |
| Air Products and Chemicals Inc | Strong · 34 | Absent | Strong · 27 | Absent | Absent |
| ThyssenKrupp AG | Strong · 30 | Strong · 19 | Absent | Absent | Absent |
| FuelPositive Corp | Strong · 12 | Strong · 12 | Strong · 11 | Strong · 11 | Absent |
Frequently asked questions
The corpus covers 954 patent families in scope. Filing activity grew sharply from 2017 onward, reaching a peak of 234 patent families in 2022 before easing in subsequent years.
Haldor Topsoe AS leads with 124 patent families, nearly 30% ahead of second-placed Casale SA at 96. Haldor Topsoe is also filing at 4.2× its prior three-year rate, indicating accelerating activity.
The field is in a Growth stage. Recent three-year filings sit 252% above the prior comparable window, confirming multi-year expansion. Annual volume peaked in 2022 and has eased since, with 2025 and 2026 figures further understated by publication lag.
China leads by patent records, followed by the United States, WIPO (PCT), and the European Patent Office. Australia, Canada, and India each show notable filing volumes, reflecting green ammonia’s relevance to energy-transition and resource-export markets.
Yes. C25B (Electrolytic production of compounds) is the second-largest IPC branch in the corpus, and leading applicants including Casale SA, Monash University, and the ThyssenKrupp entities all show significant C25B filing activity alongside core C01C coverage, indicating a clear strategic shift toward electrolysis-coupled routes.
The most active co-filing relationship is internal to the ThyssenKrupp group, with ThyssenKrupp AG and ThyssenKrupp Uhde GmbH sharing 27 joint filings. The next most active pair is Tecmerra Methane Solutions and the University of Guelph at 13 joint filings, representing an SME–academic partnership. Broader multi-party consortia are not yet evident in the data.
Ready to map your own green ammonia patent landscape?
Join 18,000+ innovators using PatSnap Eureka to map any technology landscape: search 2B+ patents and papers, surface key assignees, and generate a report like this in minutes.
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.