Green Ammonia Patents: Who Leads, Where the Gaps Are 2026
- 76.5% of filings sit with five assignees. 39 of the 51 records in scope trace back to the top five, leaving a long tail of single- or double-filing entrants.
- Filing peaked in 2022 at 19 records. activity since then has thinned, though the most recent year is always undercounted because publication lags filing by roughly 18 months.
- Ammonia synthesis and electrolysis dominate the claim space. C01C and C25B together cover most records, while gas liquefaction, pumps and seals appear in a smaller but recurring share.
Top-5 share is the combined record count of the five largest assignees divided by all 51 records in scope (CR5), not by the ranked leaders only.
What the green ammonia patent record actually shows
The dataset covers 51 published records filed between 2015 and the 2026 cut-off, drawn from claims combining green ammonia production with hydrogen pressure, gas purity, electrode catalyst, stack temperature, safety detection or electrolyzer stack terminology. This is a narrow, engineering-specific slice of the broader ammonia and hydrogen literature, not a count of every ammonia patent filed worldwide.
Filing activity is concentrated rather than diffuse: a small group of assignees accounts for the large majority of records, and the technology composition leans heavily toward ammonia synthesis chemistry and electrolytic production, with gas separation, rotating equipment and sealing showing up as recurring but secondary themes.
Filing trend and technology composition
Two views of the same 51-record dataset: how filing activity has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend: a sharp 2022 peak, then a cooldown
Filings rose from zero in 2017 to a peak of 19 records in 2022, then declined. Fewer than four complete years remain once publication lag is accounted for, so no growth rate can be stated reliably for the most recent period.
IPC composition: synthesis and electrolysis lead, gas handling recurs
C01C (ammonia, cyanides and nitrogen compounds) appears in 68.6% of the 51 records, and C25B (electrolytic production of compounds) in 54.9%. F25J gas liquefaction and separation, F04D pumps, and F16J seals and gaskets each appear in a smaller but consistent share, pointing to plant-level engineering claims layered on top of the core chemistry.
Shares are the percentage of the 51 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaRepresentative filing and most-cited records
Process for green ammonia production (WO2026114826A1)
The filing discloses an ammonia production system with a nitrogen compression unit driven to 100-300 bar, a hydrogen expander unit operating in the same pressure range, and an ammonia synthesis module fluidly coupled directly to both, converting hydrogen and nitrogen into ammonia without a syngas compressor.Filed by Nuovo Pignone Tecnologie, dated 2026-06-04.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2023078584A1 | System for ammonia production including hydrogen leak recovery from dry gas seals of hydrogen compressor, and… | 9 |
| 2 | WO2024074268A1 | Ammonia reactor and methods | 4 |
| 3 | WO2023078583A1 | Ammonia synthesis plant and method | 3 |
| 4 | US20250286385A1 | Sea-land collaboration-based multi-energy coupling low-carbon new energy system and optimal scheduling method | 2 |
| 5 | US20250162865A1 | Apparatus and method for proportional integration of green hydrogen in derivative production | 1 |
| 6 | CA3236389A1 | Ammonia synthesis plant and method | 1 |
Citation counts reflect influence within this searched corpus and skew toward older records; they are not a measure of current commercial importance.
Publication numbers are shown where the record carries one (6 of 6 rows); clicking a row searches Eureka by that number.
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Browse MCP servers →What the concentration and composition mean for filing decisions
The numbers point to a field where a handful of players occupy the core chemistry, while plant-engineering claims around gas handling and equipment remain comparatively open.
Filing is concentrated at the top
Five assignees account for 39 of the 51 records in scope. That leaves a long tail of entities with one or two filings each, which is typical of a field still being staked out rather than one with an entrenched single leader.
Core synthesis chemistry is the densest claim territory
C01C and C25B together cover the large majority of records, meaning most filers are staking claims on the ammonia synthesis reaction itself or the electrolytic hydrogen source feeding it. New entrants filing narrowly in these classes face the most crowded prior art.
Activity has cooled since the 2022 peak
Filings rose from none in 2017 to 19 in 2022 before declining. The 2026 figure is partial and understates true activity, since publication typically lags filing by around 18 months.
Filing routes split across a handful of offices
Australia and the United States each carry 11 records, with WIPO PCT filings at 9 and Europe, Canada and India each in single digits. No single office dominates the way a single assignee dominates the ranking.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to green ammonia patent landscape, with the prior art for and against each one.
Who is filing, and where momentum has stalled
The ranked leaders span industrial gas and energy majors, national research bodies and smaller technology entrants, but recent-year momentum has flattened across the board.
One assignee holds the largest single share
The leading assignee's record count sits well above the field's fifth-place holder, which had 3 records, showing a steep drop-off rather than a gradual taper.
The middle of the ranking thins out quickly
By tenth place, the count drops to 1 record, meaning half the ranked leaders are single- or near-single-filing entities. This is consistent with a field where a small core group set the early claim boundaries and a wider set of organisations followed with narrower filings.
Recent-year activity has gone flat for several leaders
Multiple assignees among the more active filers show zero records in the latest year, including year-over-year declines from prior activity. This does not necessarily mean withdrawal from the space; it may reflect the publication lag understating true recent filing.
| Assignee | Recent year | YoY |
|---|---|---|
| Nuovo Pignone Tecnologie S.r.l. | 0 | -100% |
| Siemens Energy Global GmbH & Co KG | 0 | — |
| TRAVERTINE TECH INC | 0 | — |
| United Kingdom Research and Innovation | 0 | — |
| ACWA POWER CO | 0 | — |
| L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude | 0 | — |
| VOLTA ENERGY | 0 | -100% |
| Korea Zinc Co., Ltd. | 0 | -100% |
Where to take this analysis
The dataset points to a field with a concentrated core and open plant-engineering edges. Turning that into a filing or licensing decision means going deeper on specific claims and specific assignees.
Check freedom-to-operate against the top five
Before drafting claims in ammonia synthesis or electrolytic production chemistry, review the granted claims held by the leading assignees in detail rather than relying on class-level composition alone.
Explore assignee claims in EurekaWatch the gas-handling and sealing sub-areas
F04D, F16J and F25J records recur but at lower density than the core chemistry classes, suggesting plant-integration claims may still have room before they crowd the way C01C and C25B have.
Track white space in EurekaCommon questions on the green ammonia patent landscape
This dataset covers 51 published records filed between 2015 and the 2026 cut-off, drawn from a search combining green ammonia production terminology with engineering-specific terms such as hydrogen pressure, gas purity, electrode catalyst and electrolyzer stack. It is a targeted slice of the field focused on process and equipment claims, not a count of every ammonia-related patent worldwide. Broader ammonia or hydrogen searches without these engineering qualifiers would return a larger and less focused set.
The ranking includes 20 assignees, with the leading entity holding 20 records and a steep drop to 3 records by fifth place and 1 record by tenth place. The top five combined account for 76.5% of all 51 records in scope, meaning a small group has staked out most of the claim territory while a long tail of organisations hold one or two filings each. Full names and rankings are shown in the assignee table on this page rather than repeated here.
The two densest IPC subclasses are C01C, covering ammonia, cyanides and nitrogen compounds, at 68.6% of the 51 records, and C25B, covering electrolytic production of compounds, at 54.9%. Gas liquefaction and separation, non-positive-displacement pumps, and seals and gaskets each appear in a smaller but recurring share, pointing to plant-engineering claims layered around the core synthesis and electrolysis chemistry. Because a single record can carry multiple IPC classes, these shares add up to more than 100% of records.
Filing rose from zero records in 2017 to a peak of 19 in 2022, then declined in the years that followed. A reliable growth rate cannot be stated for the most recent period because fewer than four complete years remain once the typical 18-month publication lag is accounted for, which means recent-year counts understate actual filing activity. Readers should treat the apparent 2022 peak as the clearest signal so far rather than assuming a sustained downward trend.
Sub-areas that appear less often across the 51 records include hydrogen leak recovery from compressor dry gas seals, syngas-compressor-free synthesis loop designs, and proportional integration of green hydrogen feedstock in derivative production. These lower-density areas may reflect genuine open claim space rather than technical difficulty, since the core synthesis and electrolysis classes are far more heavily filed. Anyone considering a filing in these narrower branches should still run a full freedom-to-operate check against the leading assignees' broader claims before assuming the space is clear.
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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.