Marine Propulsion Battery Patents: Top Companies & Filing Trends 2026
A data-backed look at marine propulsion battery patents: who holds the concentrated filing lead, how filings trended from a 2021 peak, and where the technology claim space is still open.
Filing growth = 2021 (29 records) → 2024 (3); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 82 records in scope (CR5), not the ranked leaders only.
What the marine propulsion battery patent record shows
Marine propulsion battery patents sit at the intersection of hull and drivetrain engineering, covering battery packaging, switching and control systems built specifically for vessels rather than adapted from road-vehicle electrification. The dataset in scope spans 82 records filed between 2015 and 2026, concentrated overwhelmingly under B63H (marine propulsion and steering), with meaningful overlap into electric vehicle propulsion classifications where battery management logic is shared across domains.
Filing activity is not evenly spread: a handful of established outboard and inboard engine manufacturers hold most of the record, while a longer list of single-filing entrants — including automation consultants and regional players — account for the remainder. The representative record on this page, a hull-integrated energy storage design, illustrates the kind of structural claim that sits outside the crowded switching-and-control core.
Filing trends and technology composition
Two views of the same 82 records: how filing activity has moved year over year, and which IPC subclasses the claims actually sit under.
A sharp peak, then a drop-off that predates the publication lag
Filings rose from zero in 2017 to a peak of 29 in 2021, then fell to 3 by 2024 — a -90% move over that three-year span. Because publication trails filing by roughly 18 months, 2025 and 2026 figures are still incomplete and should not yet be read as a continued decline.
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.
Claim space is concentrated in propulsion and steering
B63H covers 95.1% of the 82 records in scope, making it the default filing location for this technology. B60L (electric vehicle propulsion) reaches 31.7%, while B63B, B63J and H02J each sit at 13.4% — these are the classes worth watching for where propulsion-specific claims are starting to migrate.
Shares are the percentage of the 82 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaThe most-cited records in this landscape
Marine vessel with hull-integrated electrical energy storage for vessel propulsion
The filing covers battery packs with a compliant layer sealed inside a housing, and several ways of integrating that pack into a vessel hull: mounted to an inner hull surface, inserted into a dedicated hull compartment, or placed within a ballast space. It treats the battery pack as a structural and buoyancy element of the vessel rather than an add-on component.Filed by Ockerman Automation Consulting, Inc., published 2020-12-03.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6342775B1 | Automatic battery switching circuit for a marine propulsion system | 70 |
| 2 | US20110195618A1 | Systems and Methods for Controlling Battery Performance in Hybrid Marine Propulsion Systems | 45 |
| 3 | US9533747B2 | Systems and methods for controlling battery performance in hybrid marine propulsion systems | 30 |
| 4 | US20200377186A1 | Marine vessel with hull-integrated electrical energy storage for vessel propulsion | 24 |
| 5 | EP2353995A1 | Systems and methods for controlling battery performance in hybrid marine propulsion systems | 13 |
| 6 | US20120083172A1 | Auxiliary marine vessel propulsion system | 10 |
| 7 | US20210300516A1 | Marine power supply system and method for controlling marine power supply system | 9 |
| 8 | US20230294521A1 | Electric marine propulsion system and control method | 6 |
| 9 | US20220081090A1 | Marine propulsion system, outboard motor, and marine vessel | 5 |
| 10 | US20220073179A1 | Marine propulsion system and marine power supply system | 5 |
Citation counts reflect influence within the searched corpus and skew toward older filings; they are not a measure of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the concentration and composition mean for filing strategy
Three findings that shape where a new entrant can realistically stake a claim.
The leading assignee alone accounts for 36 records
With one company holding 36 of the 82 records and the top five combined reaching 90.2%, most of the useful prior art in this space sits with a small number of engine and outboard manufacturers. A new filer's freedom-to-operate analysis should start there, not with the long tail.
A steep post-peak drop that needs care in reading
The -90% swing from 2021's peak of 29 filings to 3 in 2024 is real, but 2025-2026 data is still incomplete because publication lags filing by roughly 18 months. Treat the recent years as provisional rather than evidence of a cooling field.
Propulsion and steering claims dominate the record
B63H covers the overwhelming majority of filings, while classes like F02N (engine starting, 6.1%) and B60W (hybrid vehicle control, 3.7%) remain thin. That gap is where control-logic claims adapted from road vehicles have not yet been fully re-filed for marine-specific use.
Co-filing is rare in this dataset
Only two co-assignee pairs appear across all 82 records, meaning nearly all filings are single-assignee. That makes joint-development patents unusual enough to be worth checking individually rather than assuming standard industry practice.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to marine propulsion battery patent landscape, with the prior art for and against each one.
Where to take this analysis
The dataset points to a concentrated core and a thin periphery — the next steps depend on which side of that line you are working on.
Map freedom-to-operate against the concentrated leaders
With 90.2% of records held by five companies, any new marine battery filing should be checked against their claim scope first, particularly around switching and control logic in B63H.
Run a freedom-to-operate search in EurekaWatch the under-claimed adjacent classes
B60W and F02N sit in single digits despite clear technical relevance to hybrid marine propulsion — that gap is worth monitoring for early movers before it fills in.
Track emerging filings in EurekaTreat 2025-2026 filing counts as provisional
Publication lag means the apparent drop-off after 2021 is not yet confirmed. Re-check the trend once later years complete their publication cycle.
Set an alert for new filings in EurekaCommon questions about marine propulsion battery patents
The assignee ranking is led by a single company with 36 of the 82 records in scope, and the top five assignees together hold 90.2% of all records. This means the field is concentrated among a small number of established outboard and marine engine manufacturers rather than spread across many entrants. Anyone assessing competitive risk should focus due diligence on this small group before looking at the long tail of single-filing companies.
The dataset covers 82 records filed between 2015 and 2026, with filing activity peaking at 29 records in 2021 before falling to 3 by 2024, a -90% change over that span. However, publication typically lags filing by around 18 months, so 2025 and 2026 figures are still incomplete and should not be read as confirmation of a continued decline. The confirmed peak in 2021 is the most reliable data point for judging historical momentum.
The overwhelming majority, 95.1% of the 82 records, sit under IPC class B63H (marine propulsion and steering), with meaningful overlap into B60L (electric vehicle propulsion) at 31.7%. Smaller but notable overlaps include B63B, B63J and H02J, each covering 13.4% of records, reflecting battery integration into vessel structure, auxiliaries and power supply systems. F02N (engine starting) and B60W (hybrid vehicle control) remain comparatively thin, at 6.1% and 3.7% respectively.
US20200377186A1, assigned to Ockerman Automation Consulting, describes battery packs with a compliant layer inside a sealed housing and several hull-integration approaches: mounting to an inner hull surface, inserting into a dedicated compartment, or placing the pack within a ballast space. A new design that avoids all of these specific structural arrangements, or that integrates batteries in a materially different way, would sit outside its likely claim scope. A freedom-to-operate check should compare the exact mounting and enclosure structure against this filing's claims rather than the abstract concept of hull-integrated storage.
Yes, based on the IPC composition: classes like B60W (hybrid/joint vehicle control) and F02N (engine starting) show far fewer filings than the dominant B63H and B60L classes, suggesting control-logic claims common in road-vehicle hybrids have not been fully re-filed for marine-specific applications. The near-total absence of co-assignee filings (only 2 pairs across 82 records) also suggests joint-development patent strategies are underused in this space. Both are areas where a well-drafted first claim could establish a position without competing directly against the concentrated leaders.
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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.