Marine Exhaust Gas Cleaning Systems Patents: Top Companies & Trends 2026
- 39.7% concentration. The top five assignees together hold 140 of the 353 records in scope, so scrubber design freedom narrows fast once you cross into their core claim territory.
- Filings have flattened, not grown. Activity peaked at 25 records in 2019 and had fallen back to 8 by the 2022 midpoint, with 2026 figures still incomplete due to publication lag.
- Claims cluster in exhaust treatment, not washwater. F01N exhaust-treatment classes cover 79.3% of the 353 records, while ship-specific auxiliary equipment (B63J) appears in only 3.7%.
What the marine scrubber patent record shows
Marine exhaust gas cleaning systems sit at the intersection of shipboard engineering and emissions compliance, and the patent record reflects that split. Most filings frame the invention as an exhaust treatment apparatus first and a marine-specific system second: the F01N exhaust-silencer-and-treatment subclass covers the large majority of records, while classes tied to ship auxiliaries or fuel handling appear far less often. That imbalance matters for freedom-to-operate work, because a filing that reads on general combustion-exhaust cleaning can still block a marine-specific design even if it never mentions a vessel.
The assignee field is concentrated without being closed. A handful of marine and industrial engineering firms account for a large share of the record set, but the ranking runs to 100 companies, and single-filing entrants make up a long tail behind the leaders. Filing volume has been falling since 2019, which is consistent with either a maturing claim landscape or reduced R&D investment following the initial IMO 2020 sulphur-cap filing wave — the dataset does not distinguish between the two.
Filing trends and technology composition
Two views of the same 353 records: how filing activity has moved year over year, and how those records distribute across IPC subclasses.
Filing trend, 2017-2026
Filings ran from 14 records in 2017 to a peak of 25 in 2019, then declined toward 8 by 2022. The 2026 figure of 0 reflects publication lag rather than an actual stop in filing activity, since publication trails filing by roughly 18 months.
IPC subclass composition
F01N (exhaust silencers and treatment) appears in 79.3% of the 353 records, B01D (separation processes) in 28.0%, and F02B (internal-combustion engines) in 13.6%. Because a single record can carry multiple IPC classes, these shares sum to well over 100% and should be read as overlap, not as a breakdown of the whole.
Shares are the percentage of the 353 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Marine Exhaust Gas Cleaning Systems with Eureka
This page is one run against one query. Ask Eureka your own question about marine exhaust gas cleaning systems and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records in the field
Exhaust gas cleaning system and method for cleaning exhaust gas and use of exhaust gas cleaning system
The filing describes an exhaust gas cleaning system for use onboard a ship that combines a scrubber section with a wet electrostatic precipitator arranged downstream to provide additional cleaning of the exhaust gas after the scrubbing stage. The system defines separate inlet and outlet points for the scrubbing section and covers the combined use of scrubbing plus electrostatic precipitation as a single claimed system.Abstract text and reference numerals are drawn directly from the published filing.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20060086080A1 | Engine exhaust gas cleaning method and system | 122 |
| 2 | US5601792A | Cleaning exhaust gases from combustion installations | 109 |
| 3 | US5212949A | Exhaust gas cleaning system for a marine propulsion unit | 86 |
| 4 | US20100275579A1 | Removal of particulates from the exhaust gas of internal combustion engines operated with a predominantly sto… | 83 |
| 5 | US5396767A | Engine exhaust gas cleaning system | 82 |
| 6 | US4345431A | Exhaust gas cleaning system for diesel engines | 81 |
| 7 | US20090087365A1 | Removal of particulates from the exhaust gas of internal combustion engines operated with a predominantly sto… | 80 |
| 8 | US6021639A | Black smoke eliminating device for internal combustion engine and exhaust gas cleaning system including the d… | 78 |
| 9 | US8066963B2 | Removal of particulates from the exhaust gas of internal combustion engines operated with a predominantly sto… | 68 |
| 10 | JP2011104524A | Catalyst-carrying filter and exhaust gas cleaning system | 65 |
Ranked by citation count within the searched corpus. Older records accumulate more citations simply by being available longer, so treat this as a signal of influence on later filings, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for filing strategy
Four patterns stand out once the record set is broken down by concentration, technology class and receiving office.
The top of the field is tight
Five assignees together account for 140 of the 353 records in scope. That is not a monopoly, but it means any new filing in core scrubber architecture is likely to sit close to prior art from one of a small number of established marine engineering firms.
Filing activity has cooled since the 2019 peak
Volume peaked at 25 records in 2019, likely tracking the run-up to the IMO 2020 sulphur cap, then fell to 8 by 2022. Recent-year figures understate true activity because publication lags filing by roughly 18 months, but the multi-year decline predates that effect.
Exhaust treatment claims dominate over ship-specific hardware
F01N exhaust-treatment classifications cover 79.3% of records, while B63J (ship auxiliaries) covers only 3.7%. Vessel-specific integration detail — mounting, space and weight constraints unique to a ship — is comparatively under-claimed relative to the exhaust-chemistry side of the invention.
US and European filings lead, Japan and PCT trail
The United States (93) and the European Patent Office (87) are the two largest receiving offices, with Japan (22), WIPO/PCT (19), Germany (17) and Austria (16) well behind. A filing strategy built only around US and EPO coverage would miss meaningful activity in the smaller offices.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to marine exhaust gas cleaning systems, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked list runs to 100 companies, with a small group of marine and industrial engineering firms holding a disproportionate share of records and everyone else filing far less densely.
One firm sits well ahead of the field
The leading assignee holds 45 records, roughly triple the fifth-place total of 13. That gap suggests a sustained, focused filing programme rather than opportunistic patenting around a single product cycle.
The drop-off after the leaders is gradual, not a cliff
Tenth place holds 9 records, only slightly behind fifth place at 13. This gradual taper, rather than a sharp cliff, points to several mid-sized engineering firms maintaining active but smaller portfolios alongside the top group.
Named leaders show no output in the most recent year
Several of the most active historical assignees show zero filings in the latest tracked year. Given the roughly 18-month publication lag, this is more likely a reporting artefact than a genuine stop, but it means recent competitive momentum cannot be read directly from this year's figures.
| Assignee | Recent year | YoY |
|---|---|---|
| Alfa Laval Corporate AB | 0 | — |
| Hitachi Construction Machinery Co., Ltd. | 0 | — |
| Wartsila Finland Oy | 0 | — |
| Yara Marine Technologies AS | 0 | — |
| Honda Motor Co., Ltd. | 0 | — |
| Mercedes-Benz Group AG | 0 | — |
| Nissan Motor Co., Ltd. | 0 | — |
| Umicore AG & Co. KG | 0 | — |
Where to take this next
The dataset points to specific follow-up work depending on whether you are clearing a design or scouting a gap.
Run a freedom-to-operate check against the top 5
With 39.7% of records held by five assignees, a scrubber or washwater design should be checked against their specific claim scope before committing to a build, not just against the field in general.
Check claim overlap in EurekaWatch for the 2024-2026 publication catch-up
Because publication trails filing by about 18 months, the apparent decline after 2022 will partly reverse as later filings publish. Re-run the trend view periodically rather than treating the current curve as final.
Track new filings in EurekaScope the under-claimed branches before the leaders do
Ship-specific auxiliary hardware (B63J) and sludge-handling claims sit well below the exhaust-treatment core in filing density. That gap narrows the further leaders extend their existing programmes into it.
Explore white space in EurekaCommon questions on marine scrubber patents
The record set of 353 patents is led by one assignee with 45 records, well ahead of the fifth-ranked firm at 13. The top five assignees together hold 140 records, or 39.7% of all 353 records in scope, which means a small group of marine and industrial engineering companies controls a meaningful share of the claim space. Beyond the top ten, the ranking extends to 100 companies with a long tail of smaller and single-filing entrants, so the field is concentrated at the top but not closed to new entrants working in adjacent areas.
Filing activity peaked at 25 records in 2019 and had declined to 8 records by the 2022 midpoint, indicating a flattening or declining trend rather than sustained growth. The 2019 peak likely reflects the run-up to the IMO 2020 global sulphur cap, which drove a wave of scrubber development. Figures for 2024 through 2026 should be read cautiously, since patent publication typically lags filing by about 18 months and will understate true recent activity.
F01N, the IPC subclass covering exhaust silencers and treatment, appears in 79.3% of the 353 records, making it by far the dominant classification. B01D (separation processes such as filtration) follows at 28.0%, and F02B (internal-combustion engines) at 13.6%. Ship-specific hardware classified under B63J appears in only 3.7% of records, suggesting that most patents frame the invention around general exhaust chemistry rather than marine-specific integration.
The technology composition data shows ship-specific auxiliary equipment (B63J, 3.7% of records) and fuel supply integration (F02M, 4.2%) are comparatively under-claimed relative to the dominant exhaust-treatment cluster. Areas like closed-loop washwater neutralisation hardware, onboard sludge dewatering, and retrofit corrosion-resistant components sit outside the densest claim clusters. These are not guarantees of open claim space, but they warrant closer prior-art review before assuming a design is blocked.
US20220325646A1, assigned to Alfa Laval Corporate AB and published in October 2022, claims an exhaust gas cleaning system that combines a scrubber section with a downstream wet electrostatic precipitator, defining specific inlet and outlet arrangements for each stage. It would most directly affect designs that pair scrubbing with electrostatic precipitation in a similar staged configuration. It does not cover scrubber systems generally, so designs using a single-stage scrubber or a different secondary treatment technology may fall outside its specific claim scope, though a full claim-by-claim review is needed to confirm freedom to operate.
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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.
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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.