Marine Engine NOx Reduction Patents: Top Companies & Trends 2026
Marine Engine NOx Reduction Patents: Who Leads and Where Filing Is Heading
34.5% of all 5,168 records sit with just five assignees, and the top ten hold 50.5% — this field is concentrated, not fragmented. Filings peaked in 2017 at 239 records. The only span the data supports treating as a completed trend is 2021 to 2024, where filings dropped 67%, from 107 to 35 records. Years after 2024 show low counts (down to 7 in 2026) purely because publication has not caught up with filing — they are not evidence the field has gone quiet.
- 1TOYOTA JIDOSHA KK10.4%
- 2JOHNSON MATTHEY PLC8.7%
- 3GM GLOBAL TECHNOLOGY OPERATIONS LLC6.2%
- 4MAZDA MOTOR CORP4.8%
- 5VOLVO TRUCK CORP4.3%
See the full marine engine nox reduction 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 this landscape
Who holds the most patents in marine engine NOx reduction?
One assignee leads clearly with 540 records, well ahead of fifth place at 223 and tenth place at 147. The top five combined account for 34.5% of all 5,168 records in scope, and the top ten reach 50.5%, so filing activity is concentrated among a small group of established engine and catalyst manufacturers rather than spread evenly across the field. Anyone assessing freedom to operate should check the leader’s portfolio first, since it dominates the ranked list by a wide margin.
Is patent filing in this area growing or shrinking?
The only span the data supports as a complete trend is 2021 to 2024, over which filings dropped 67%, from 107 to 35 records, following a 2017 peak of 239. Counts for 2025 and 2026 appear much lower still, but that reflects publication lag of roughly 18 months rather than an actual halt in filing. Treat any figure from the last one to two years as provisional until later publication catches up.
What technology areas dominate marine NOx reduction patents?
Exhaust treatment hardware, classified under F01N, appears in 43.4% of the 5,168 records, making it the single densest subclass. Engine control methods (F02D) follow at 31.6% and separation or filtration processes (B01D) at 25.9%, with internal-combustion engine design and fuel supply systems each around 20%. Because a single filing can carry several IPC codes, these percentages overlap rather than summing to a whole 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 Marine Engine NOx Reduction 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.