Ballast Water Treatment Patents: Top Companies & Trends 2026
A data-backed look at ballast water treatment patents: who leads filings, how the technology mix breaks down across IPC classes, where filing activity is heading, and where the white space sits.
Filing growth = 2021 (50 records) → 2024 (25); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 1,703 records in scope (CR5), not the ranked leaders only.
What the ballast water treatment patent record shows
Ballast water treatment covers the systems vessels use to disinfect or filter seawater taken on for stability before it is discharged elsewhere, a requirement driven by international rules on invasive species transfer. The patent record in scope spans 1,703 records filed between 2015 and 2026, drawn from IPC classes covering ships (B63B), ship auxiliaries (B63J) and water treatment (C02F) alongside separation and electrolytic processes. Filing activity peaked in 2017 at 99 records and has since receded, tracking the initial wave of compliance-driven system development after ballast water treatment conventions began taking effect.
The assignee ranking is concentrated: the leader holds 100 records, and the top five assignees together account for 25.0% of all records in scope. That concentration sits alongside a long tail of smaller filers, single-country entrants and academic groups, particularly out of South Korea, Japan and China — the three receiving offices that dominate where this technology gets filed.
Filing trends and technology composition
Two views of the same 1,703-record dataset: how filing volume has moved year over year, and which technical branches carry the claim density.
Filing trend: a 2017 peak followed by a documented pullback
Annual filings ran from 99 in 2017 down to 4 in the still-incomplete 2026 count. The comparison the dataset supports directly is 2021 (50) to 2024 (25), a 50% decline over that three-year span. Because publication typically lags filing by around 18 months, 2025 and 2026 figures are undercounted and should not be read as evidence the field is still cooling.
Publication lags filing by roughly 18 months, so 2025 onwards are still filling in. Growth rates on this page therefore end at 2024; running them to the last bar would understate the field.
Technology composition: water treatment and vessel classes dominate
C02F (water and wastewater treatment) appears on 78.6% of the 1,703 records and B63B (ships and marine vessels) on 76.7%, confirming that most filings combine a treatment process with a vessel-system context rather than claiming either in isolation. B63J (ship auxiliaries, 50.9%) and B01D (separation processes, 21.5%) form the next tier. Narrower branches — B01F mixing (3.3%), C25B electrolytic production (2.9%), G01N analysis (2.5%) and B03C magnetic/electrostatic separation (1.6%) — carry far fewer records, which is where claim space is comparatively open rather than fully occupied.
Shares are the percentage of the 1,703 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Ballast Water Treatment Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about ballast water treatment patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records and a representative filing
Vessel, ballast water treatment system and ballast water treatment method (EP3378837A1)
Filed by JFE Engineering, this filing addresses a practical downstream problem in chemical treatment: residual chlorine-based antiseptic left in ballast water after treatment. The vessel's ballast pump runs in two modes — one circulating seawater into the tank for storage, one bypassing the tank to discharge directly — with injection points for the antiseptic and, separately, for a neutralising agent applied to at least part of the residual chemical before discharge.Filed 2018-09-26 by JFE Engineering Corporation.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6125778A | Ballast water treatment | 120 |
| 2 | JP2007144391A | Ballast water treatment apparatus and method | 113 |
| 3 | US5816181A | Ballast water treatment system | 83 |
| 4 | US20030029811A1 | Ballast water treatment for exotic species control | 68 |
| 5 | US6773611B2 | Methods, apparatus, and compositions for controlling organisms in ballast water | 64 |
| 6 | JP2013023187A | Ballast water treatment apparatus | 50 |
| 7 | JP2009112978A | Ballast water treatment system | 50 |
| 8 | JP2011092898A | Ballast water treatment apparatus | 49 |
| 9 | US20080277354A1 | Ballast Water System | 48 |
| 10 | JP2011092899A | Ballast water treatment apparatus | 46 |
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 on the field's early framing, not a ranking of current technical importance.
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 read-throughs of the dataset that matter more for a filing decision than the raw ranking table.
The top of the field is dense, the rest is open
A quarter of all records in scope belong to just five assignees, and the leader alone holds 100 records. That density makes core disinfection and filtration claims crowded prior art, but it also means the remaining 75% of filings are spread across a long tail of smaller entrants — a workable entry point for a team with a genuinely differentiated mechanism.
A real pullback, not a stalled field
Filings fell from 50 in 2021 to 25 in 2024, a decline the dataset supports directly. That likely reflects the first compliance wave of ballast water treatment systems maturing rather than the technology losing relevance — treatment remains mandatory, so filing volume tracks system-design cycles, not market interest.
Vessel-plus-treatment claims dominate, standalone process claims are rarer
The overlap between C02F (78.6%) and B63B (76.7%) shows most applicants claim the treatment process integrated with the vessel system, not the chemistry or filtration step alone. Narrower classes — magnetic/electrostatic separation at 1.6%, electrolytic production at 2.9% — carry far fewer records and are the branches worth checking before assuming a mechanism is already covered.
Filing geography tracks shipbuilding capacity
South Korea's 638 filings put it well ahead of Japan (289), China (217), Europe (137) and the United States (134). That ordering lines up with where large shipyards and marine equipment suppliers sit, which matters for freedom-to-operate checks — a design cleared in one jurisdiction is not automatically clear in the one where the vessel will actually be built.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to ballast water treatment patent landscape, with the prior art for and against each one.
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is filing, freedom-to-operate, or partnership scouting.
Check freedom-to-operate against the top 10
The top 10 assignees hold 39.7% of all 1,703 records between them. Any new filing in core disinfection, filtration or UV/electrolytic treatment should be checked against this group's claim scope before drafting, not after.
Run a freedom-to-operate checkTarget the under-claimed branches first
B03C (magnetic/electrostatic separation, 1.6%), G01N (analysis, 2.5%) and C25B (electrolytic production, 2.9%) carry the fewest records of the eight tracked classes. A first-to-file position is still realistic there for a genuinely new mechanism.
Explore white space branchesRe-check the trend once 2025–2026 data settles
Because publication lags filing by about 18 months, the 2025 and 2026 counts will keep rising as more records post. Revisit the -50% 2021–2024 comparison in a future pull before treating it as the field's final direction.
Track the filing trendCommon questions about ballast water treatment patents
The ranked leader in this dataset holds 100 records, and the top five assignees together account for 25.0% of all 1,703 records in scope. Beyond the leader, holdings drop off quickly — fifth place sits at 65 records and tenth place at 41 — which means the field has a small dense cluster at the top and a long tail of smaller filers below it. Anyone assessing competitive position should look at both the absolute leader and the shape of that drop-off, since a single dominant holder and a crowded top-ten produce very different filing strategies.
Over the one complete comparison window the dataset supports, filings fell from 50 in 2021 to 25 in 2024, a 50% decline. Filing peaked earlier, in 2017, at 99 records, so the current trend is a pullback from an initial compliance-driven wave rather than continued acceleration. The 2025 and 2026 counts in the same dataset are lower still, but publication typically lags filing by about 18 months, so those final years understate true filing activity and should not be read as proof the decline is continuing.
The dominant classes are C02F (water and wastewater treatment), present on 78.6% of the 1,703 records, and B63B (ships and marine vessels), present on 76.7%, reflecting that most filings combine a treatment process with a vessel-integrated system. B63J (ship auxiliaries) and B01D (separation processes such as filtration) form a second tier at 50.9% and 21.5% respectively. Smaller but distinct branches include B01F (mixing), C25B (electrolytic production), G01N (analysis and testing) and B03C (magnetic/electrostatic separation), each under 4% of records and worth checking separately for open claim space.
South Korea is the leading receiving office in this dataset with 638 filings, followed by Japan (289), China (217), the European Patent Office (137), the United States (134) and the WIPO PCT route (125). This ordering reflects where major shipbuilding and marine equipment supply chains are concentrated rather than where the underlying invention necessarily originated. Teams doing freedom-to-operate work should treat South Korea and Japan as the jurisdictions with the deepest prior art on this topic.
EP3378837A1, filed by JFE Engineering, covers a vessel with a ballast pump that can run in two modes — circulating seawater into a ballast tank for storage, or bypassing the tank to discharge directly — combined with injection points for a chlorine-based antiseptic during the first mode and a separate injection for a neutralising agent applied to at least part of the residual chemical before discharge. It is a narrow, mechanism-specific filing aimed at the operational problem of residual antiseptic remaining after treatment, not a claim over ballast water disinfection generally. Designing around it would mean avoiding this particular dual-mode pump plus dual-injection-point combination, for instance by neutralising residual chemical continuously rather than through a separate discharge-mode injection step.
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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.