Green Ammonia Synthesis Loop Patents: Leaders & Filing Trends 2026
Green ammonia synthesis loop patents: who holds the loop technology and where it is still open
Filings jumped +667% from 2021 to 2024, rising from 6 to 46 published records a year as flexible Haber-Bosch operation moved from pilot claims to filed IP. Annual filings climbed from 26 in 2017 to a peak of 46 in 2024, with the sharpest acceleration in the three years to 2024 (+667%, from 6 to 46). The 2025 and 2026 figures are still filling in as publications catch up to filing dates, so read the tail of the chart as incomplete rather than declining.
- 1JOHNSON MATTHEY PLC63
- 2HALDOR TOPSOE AS50
- 3ACETEX30
- 4KELLOGG BROWN & ROOT INC20
- 5CASALE SA18
See the full green ammonia synthesis loop analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on green ammonia synthesis loop patents
Who holds the most patents on green ammonia synthesis loops?
One assignee leads the ranked list with 63 of the 340 records in scope, well ahead of fifth place at 18 and tenth place at 8. The top 5 assignees combined hold 53.2% of all records and the top 10 hold 70.9%, so the field is concentrated among a small group of established ammonia-plant licensors and engineering contractors rather than spread evenly across many filers. Anyone doing freedom-to-operate work should start with that leading assignee’s claim families before moving down the ranked list.
Is filing activity in this space growing or slowing down?
Filings grew sharply, from 6 in 2021 to 46 in 2024, a +667% increase over that three-year span and the peak year in the dataset. Counts for 2025 and 2026 appear lower, but publication lags filing by roughly 18 months, so those recent years are still filling in rather than reflecting an actual drop in activity. The honest read is accelerating filing through 2024, with the most recent two years too incomplete to call a trend either way.
What technology areas dominate green ammonia synthesis loop patents?
IPC subclass C01C (ammonia, cyanides and nitrogen compounds) appears on 64.4% of the 340 records, and C01B (non-metallic elements and inorganic compounds) on 51.2%, showing that most filings address the core synthesis chemistry. Separation processes (B01D, 17.4%) and catalysis (B01J, 12.4%) follow at a distance, while electrolytic production (C25B, 5.0%) and mixing/stirring (B01F, 3.2%) are the smallest categories tracked. Because a single record can carry multiple IPC codes, these shares add up to more than 100% and should be read as relative weight, not a partition of the field.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Green Ammonia Synthesis Loop covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.