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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/ammonia-combustion-and-cofiring-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Ammonia Combustion & CofiringAmmonia Combustion and Cofiring Patents: Filing Trends and Leading Assignees
- Concentrated but not locked up: the top 5 assignees hold 36.1% of all 158 records in scope, and the top 10 hold 52.5% — leaving a long tail of single- and few-filing entrants.
- Filing kept climbing through 2024: annual filings rose 60% from 2021 (15) to 2024 (24), the most recent year the trend can be read as complete given publication lag.
- Engine and separation classes dominate: F02D engine control (20.9%) and B01D separation processes (19.6%) lead the technology mix, ahead of combustion chambers and gas-turbine plants.
158
Published Records
36%
Top-5 Share of All Records
+60%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (15 records) with 2024 (24) — 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 158 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What the ammonia combustion patent record shows
Ammonia combustion and cofiring patenting covers a mix of stationary power and mobile propulsion problems: how to burn a fuel with a lower flame speed and higher nitrogen-oxide formation tendency than natural gas or diesel, how to hold unburned ammonia to acceptable levels, and how to retrofit existing boilers and gas turbines rather than build new plant. The 158 records in scope span filings from 2015 through the partial-year 2026 cut-off, concentrated most heavily in engine control, separation processes and combustion-chamber design.
Filing activity was negligible before 2017 and built steadily to a peak of 28 records in 2023, with the 2021-to-2024 span showing sustained growth. Readers should treat 2025 and 2026 counts as understated: publication typically lags filing by around 18 months, so recent-year totals will keep rising as more applications publish.
Filing activity by year, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Ammonia Combustion and Cofiring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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Data
Filing trend and technology composition
Two views of the same 158-record dataset: the yearly filing curve, and the IPC subclasses that carry the underlying technical claims.
A decade of build-up, peaking in 2023
Filings moved from zero in 2017 to a peak of 28 in 2023, with the 2021–2024 window alone showing 60% growth (15 to 24 records). The 2026 figure of 6 is a partial year and should not be read as a slowdown.
Engine control and separation lead a broad spread
F02D (engine control) and B01D (separation processes) each cover close to a fifth of the 158 records, with F23R (combustion chambers), F02C (gas-turbine plants), C01B, F02M, F02B and F23D (burners) all represented at meaningful but lower shares. Because records can carry multiple IPC classes, these shares sum to more than 100% of the record total.
Shares are the percentage of the 158 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Ammonia Combustion and Cofiring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Most-cited records and a recent filing
Representative recent filing
Natural gas co-firing ammonia burner (US20260185701A1)
METAL INDUSTRIES RESEARCH & DEVELOPMENT CENTRE
The filing describes a burner with concentric gas intake pipes: an outer channel mixing air and natural gas ahead of a first spout, and an inner channel carrying an ammonia-air premix to a second spout surrounded by the first. A swirl mechanism and a defined separation distance between the two spouts govern how the two fuel streams combine before ignition.Filed by Metal Industries Research & Development Centre, published 2026-07-02.
Most-cited records in the dataset
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20110011354A1 | Methods and apparatus for using ammonia as sustainable fuel, refrigerant and NOx reduction agent | 104 |
| 2 | US8206470B1 | Combustion emission-reducing method | 76 |
| 3 | US20120148925A1 | Ammonia flame cracker system, method and apparatus | 55 |
| 4 | US20230053230A1 | Integrated heat exchanger reactors for renewable fuel delivery systems | 40 |
| 5 | US20220364505A1 | Renewable fuel power systems for vehicular applications | 38 |
| 6 | US8272353B2 | Apparatus for using ammonia as a sustainable fuel, refrigerant and NOx reduction agent | 37 |
| 7 | US8691182B2 | Ammonia flame cracker system, method and apparatus | 18 |
| 8 | US11598276B1 | Methods and systems for multi-fuel engine | 15 |
| 9 | US20200018231A1 | Combustion device and gas turbine | 14 |
| 10 | US20230175431A1 | Methods and systems for multi-fuel engine | 13 |
Citation counts favour older records simply because they have had longer to accumulate citations inside the searched corpus — treat them as a signal of influence, not of current technical importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Ammonia Combustion and Cofiring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing decision
Three patterns stand out once the ranking, the trend and the technology split are read together.
Concentration
36.1% / 52.5%
top 5 / top 10 share of 158 records
Leadership is real but not exclusive
The leader holds 19 records and fifth place holds 6 — a steep drop-off that still leaves 47.5% of the field outside the top 10. A new entrant is not filing into a closed space, but is filing alongside assignees who already hold meaningful blocking positions in specific subclasses.
72 assignees ranked in total
Momentum
+60%
filings, 2021 → 2024
Growth is recent and still building
The three-year run from 15 filings in 2021 to 24 in 2024 is the clearest signal of where activity is heading, since 2025 and 2026 counts are still incomplete due to publication lag. Any read of the trend should anchor on 2024 as the last complete year.
Peak year so far: 2023, 28 records
Technology mix
20.9% / 19.6%
F02D engine control / B01D separation, share of records
Engine control and separation lead, combustion hardware follows
F02D and B01D together outpace the combustion-specific classes (F23R, F02C, F23D), suggesting a large share of claim activity sits in system-level control and gas separation rather than burner or flame-front design narrowly.
8 IPC subclasses tracked, each above 8.9% of records
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Co-filing is rare
| Assignee | Co-assignee | Shared families |
|---|---|---|
| L'Air Liquide, Société Anonyme pour l'Étude et l'Exploitation des Procédés Georges Claude | Air Liquide USA LLC | 2 |
| VAST ENERGY SOLUTIONS LLC | HAGEN DAVID LEROY | 2 |
| VAST ENERGY SOLUTIONS LLC | GINTER GARY | 1 |
| VAST ENERGY SOLUTIONS LLC | BUSHBY DONALD P | 1 |
Only 4 co-assignee pairs appear across the dataset, each at 1 or 2 shared records — most filings here are single-assignee, with little sign of joint-venture patenting so far.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Ammonia Combustion and Cofiring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is filing, and where the gate sits
The ranked leaders span industrial engine and boiler makers, gas-turbine and heat-exchanger specialists, and at least one ammonia-cracking fuel-systems entrant, but no single player controls the field.
Scale leader
19 records
leader's family count
A single leader well ahead of the field
The top-ranked assignee holds 19 of the 158 records, more than three times fifth place at 6 — a gap that marks out a genuine leader rather than a crowded first tier.
Leader vs. fifth place: 19 vs. 6
Mid tier
6 to 4
records, 5th to 10th place
A compressed second tier
From fifth to tenth place the record counts narrow to a tight band (6 down to 4), indicating several assignees are filing at comparable pace just behind the leader rather than one clear runner-up.
Top 10 combined: 83 records, 52.5% of the field
Long tail
72 ranked
assignees in the ranking
A wide base of occasional filers
With 72 assignees ranked against 158 records, most entrants hold only one or two families — evidence of a technology area still open to new claim positions outside the concentrated top tier.
Co-assignee pairs: only 4 across the dataset
Recent-year momentum
| Assignee | Recent year | YoY |
|---|---|---|
| VAST ENERGY SOLUTIONS LLC | 1 | 0% |
| Ishikawajima-Harima Heavy Industries Co., Ltd. (IHI) | 0 | -100% |
| AMOGY INC | 0 | -100% |
| JFE Engineering Corporation | 0 | — |
| Uhde GmbH | 0 | — |
| General Global Sourcing LLC | 0 | — |
| L'Air Liquide, Société Anonyme pour l'Étude et l'Exploitation des Procédés Georges Claude | 0 | -100% |
| Toyota Industries Corporation | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Ammonia Combustion and Cofiring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio strategy, or scouting.
Check freedom-to-operate around the leader's claims
With the top assignee holding 19 records, a targeted claim-chart review of its family is a faster first check than a full landscape re-run before committing to a specific burner or control-system design.
Run a claim comparison in EurekaTrack the 2023–2024 filing surge by applicant
The +60% growth from 2021 to 2024 is broad-based rather than tied to one filer; watching which of the ranked assignees are driving the recent volume helps anticipate where contested claim space will emerge next.
Set up assignee monitoring in EurekaScope the under-claimed branches before drafting
Ignition assistance, unburned-ammonia control and boiler-retrofit hardware show lighter density than the core engine-control and separation classes — worth a focused prior-art pull before drafting new claims there.
Explore white space in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Ammonia Combustion and Cofiring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on ammonia combustion patents
The dataset behind this landscape contains 158 published records covering ammonia combustion, cofiring and related burner technology, filed between 2015 and the 2026 data cut-off. These records are ranked across 72 distinct assignees, so no single company holds anywhere close to a majority. Because publication lags filing by roughly 18 months, the most recent one to two years of this count will keep rising as more applications publish.
The ranking is led by a single assignee holding 19 records, well ahead of fifth place at 6 and tenth place at 4. Combined, the top 5 assignees account for 36.1% of all 158 records and the top 10 account for 52.5%, leaving nearly half the field spread across a long tail of smaller filers. This pattern — one clear leader, a compressed mid-tier, and a wide base of occasional filers — suggests the technology is still open to new entrants rather than locked up by an incumbent group.
Yes: annual filings rose from 15 in 2021 to 24 in 2024, a 60% increase over that three-year span, with a peak of 28 records in 2023. Filing activity was essentially absent before 2017, so this is a technology area that has built up patent density almost entirely within the last decade. Figures for 2025 and 2026 are still incomplete due to normal publication lag and should not be read as a decline.
Engine control (IPC class F02D) and separation processes (B01D) are the two largest categories, covering 20.9% and 19.6% of the 158 records respectively. Combustion chambers (F23R), gas-turbine plants (F02C), inorganic compounds (C01B), fuel supply systems (F02M), internal-combustion engines (F02B) and burners (F23D) follow at lower but still meaningful shares. Since a single record can carry multiple IPC classes, these percentages sum to more than 100% of the record total and should be read as overlapping coverage rather than a strict breakdown.
Relative to the dense engine-control and separation-process classes, areas such as ignition assistance for low flame-speed ammonia, unburned-ammonia slip control, boiler-retrofit hardware for variable cofiring ratios, and NOx formation control specific to ammonia flames show comparatively lighter claim density. These are not unclaimed, but they carry less concentrated prior art than the core system-level classes. A prior-art pull focused on these specific sub-areas is a more efficient starting point than a broad landscape search before drafting new claims.
Answers are grounded in the same dataset. Derived from a Patsnap search on Ammonia Combustion and Cofiring covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.