Onboard Charger for Marine Propulsion Patent Landscape
The onboard charger for marine propulsion space is in active Growth, with annual filings still rising and a multi-year window showing 81% expansion. Activity is moderately concentrated: the top five filers hold 46% of the combined output of the hundred largest filers, led by GM Global Technology Operations and Volvo Truck Corporation.
GM Global Technology Operations leads a moderately concentrated field
GM Global Technology Operations LLC holds the top position with 15 patent families, followed closely by Volvo Truck Corporation at 14 and Thermo King Corporation at 9, establishing a clear first tier of automotive and commercial-vehicle incumbents extending their electrification platforms toward marine applications.
The top five filers — GM Global Technology Operations, Volvo Truck, Thermo King, Caterpillar, and Energobit — collectively account for 46% of the combined output of the hundred largest filers. This concentration level is moderate: no single applicant commands an overwhelming share, and challengers from 6th rank downward remain within striking distance.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | GM Global Technology Operations LLC | 15 | |
| 2 | Volvo Truck Corporation | 14 | |
| 3 | Thermo King Corporation | 9 | |
| 4 | Caterpillar Inc. | 8 | |
| 5 | Energobit SA | 7 | |
| 6 | Volvo Car Corporation | 5 | |
| 7 | NINGBO GEELY AUTOMOBILE RES & DEV CO LTD | 5 | |
| 8 | Brunswick Corporation | 5 | |
| 9 | WiTricity AI Tech LLC | 5 | |
| 10 | Zhejiang Geely Holding Group Co., Ltd. | 5 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | EVOA LLC | 3 | |
| 12 | Cummins Inc. | 3 | |
| 13 | Volvo Penta AB | 2 | |
| 14 | The Hong Kong Polytechnic University | 2 | |
| 15 | Eaton Intelligent Power Ltd. | 2 | |
| 16 | Hydrogenics Corporation | 2 | |
| 17 | NIO Technology (Anhui) Co., Ltd. | 2 | |
| 18 | Rivian Holdings LLC | 1 | |
| 19 | Navico Group Americas LLC | 1 | |
| 20 | VSS Teknoloji Limited Sirketi | 1 |
The dominant players are primarily land-vehicle and powertrain specialists, which implies that marine-native design knowledge (hull integration, saltwater resilience, variable-load profiles) remains an opening for focused entrants such as Brunswick Corporation and Volvo Penta, both present but ranked below the top five.
Filings from approximately 2024–2025 onward are likely under-counted due to standard patent-publication lag; the apparent plateau at the end of the trend series should not be read as a slowdown. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Annual volume is rising and EV-propulsion classes dominate the technology mix
Two charts together characterize the field’s pace and technical focus: the annual filing trend shows where momentum sits on the timeline, while the IPC composition reveals which technical problems are attracting the most invention effort.
Annual filing trend
From a near-zero baseline in 2017–2018, filings accelerated sharply into 2021 and have held at an elevated level through 2024. The 81% multi-year growth figure confirms the field is genuinely expanding. The 2025 bar is visibly lower, consistent with publication lag rather than a real deceleration; treat it as incomplete data.
↗ Hover for values · click a bar to ask EurekaTechnology composition
B60L (Electric vehicle propulsion) is the dominant IPC class by a wide margin, reflecting that most onboard-charger innovation is being filed under the broader EV propulsion taxonomy rather than marine-specific classes. H02J (Power supply and grid systems) is a secondary cluster. Marine-specific classes B63H and B63B each register single-digit counts, indicating that explicitly marine-framed charging patents remain sparse relative to the overall corpus.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Assembly for providing electric power to a marine …
An assembly for a marine vessel (42) includes a housing (370, 470, 570, 670) forming a watertight enclosure (352, 452, 452a, 552, 652). A battery pack (312a, 412a, 512a, 612a) is sealed within the watertight enclosure (352, 452, 452a, 552, 652). An onboard charger (346, 446, 546, 646) is sealed within the watertight enclosure (352, 452, 452a, 552, 652) and… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Vehicle power management utilizing operator schedu… | 91 |
| 2 | Vehicle power management utilizing operator schedu… | 33 |
| 3 | Transport climate control system with an accessory… | 30 |
| 4 | Power systems and methods for electric vehicles | 25 |
| 5 | System and method for managing power and efficient… | 23 |
| 6 | System and method of a mobile electrical system | 17 |
| 7 | Axial flux propulsion system for an electric boat | 15 |
| 8 | Fuel cell powertrain systems and methods for power… | 11 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment decisions
Four structural signals — lifecycle stage, concentration, collaboration patterns, and geographic spread — translate directly into investment risk and opportunity framing for engineering and strategy teams.
Growth stage: annual filings still rising from a low base
The lifecycle is classified as Growth, with annual filings still rising and a multi-year window showing 81% expansion. The field emerged meaningfully only around 2019–2021, so core architecture patents are still being filed rather than expired. Entrants can still shape foundational claim space, but the window for unchallenged filing is narrowing as automotive incumbents accelerate portfolio building.
Growth stageModerate concentration with a competitive second tier
The top five filers hold 46% of the combined output of the hundred largest filers — significant but not lock-out territory. The gap between the top two (GM at 15 patent families, Volvo Truck at 14) is narrow, suggesting no single entity has consolidated dominance. A focused challenger filing 8–10 targeted families in marine-specific subclasses could move into the top five within two to three years.
Moderate concentrationIntra-group co-filing is the primary collaboration pattern observed
The one documented co-applicant pairing is Zhejiang Geely Holding Group and Ningbo Geely Automobile Research and Development Co., with 5 jointly filed patent families — an intra-group coordination rather than an external alliance. No cross-industry or academic-industry co-filing is evident in the evidence. This absence of broad collaboration suggests the ecosystem has not yet formed the open consortia common in more mature EV sub-sectors.
Intra-group onlyUS-centric filings with limited Asia-Pacific coverage
The United States leads jurisdictional coverage, followed by Europe via EPO and WIPO PCT filings. India appears as a fourth jurisdiction, likely reflecting engineering centers of Thermo King and Caterpillar suppliers. Marine-heavy markets such as Norway, Japan, and South Korea are not explicitly represented in the evidence, pointing to a potential gap in regional IP coverage for applicants targeting those ship-building ecosystems.
US-led filingGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Zhejiang Geely Holding Group Co., Ltd. | Ningbo Geely Automobile Research & Development Co., Ltd. | 5 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
GM and Volvo Truck lead; marine-native Brunswick is an emerging specialist
The top two filers are land-vehicle electrification incumbents that have entered this space recently and at scale, while Brunswick Corporation represents the most prominent marine-native applicant in the ranking.
GM Global Technology Operations LLC
GM Global Technology Operations leads with 15 patent families and is classified as a new entrant by momentum data, meaning its recent filings are driving the bulk of its portfolio in this topic. Its technology emphasis spans B60L 53 (EV charging), B60L 50 (EV propulsion storage), and B60L 58 (battery management), indicating a broad EV-charging platform approach being extended toward marine contexts rather than marine-specific design.
patent families: 15Volvo Truck Corporation
Volvo Truck Corporation holds 14 patent families but shows a momentum trend of –60% in recent filings versus its prior period, suggesting its peak activity in this topic may have passed. Its technology focus is heavily weighted toward B60L 58 (battery and energy-storage management), with secondary coverage in B60L 1 and B60L 50, reflecting a heavy-vehicle powertrain perspective. Its sister entity Volvo Penta, the marine division, holds only 2 patent families — an asymmetry worth monitoring.
patent families: 14| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| GM Global Technology Operations LLC | 13 | ▲ new entrant |
| Volvo Truck Corporation | 4 | ▼ -60% |
| Caterpillar Inc. | 4 | ▲ new entrant |
| Energobit SA | 7 | ▲ new entrant |
| Zhejiang Geely Holding Group Co., Ltd. | 2 | ▲ new entrant |
| Volvo Car Corporation | 5 | ▲ new entrant |
| Brunswick Corporation | 3 | ▲ new entrant |
| Ningbo Geely Automobile Research & Development Co., Ltd. | 2 | ▲ new entrant |
Marine-specific and motor-integration branches remain under-served
Several IPC branches adjacent to the dominant B60L cluster carry low patent counts relative to their technical relevance to onboard marine charging, suggesting room for targeted filing by entrants with marine engineering depth.
B63H · Marine propulsion and steering
With only 7 patent records under B63H, explicit marine-propulsion framing is sparse despite being the most directly relevant class for this application domain. Patents in this branch would cover charging integration with shaft drives, pod propulsors, and hybrid marine drivetrains — technically distinct from land-vehicle adaptations. An applicant with marine drivetrain expertise could establish foundational claim positions here with a modest filing program, as the current incumbents have not prioritized this class.
Search this in Eureka →H02K · Electric motors and generators
H02K, covering electric motors and generators, shows only 6 patent records — unusually low given that onboard charger efficiency is tightly coupled to motor regeneration and generator topologies in hybrid marine systems. Axial-flux and permanent-magnet motor designs optimized for marine charging cycles (as hinted by the top-cited patent on axial flux propulsion for electric boats) are a plausible entry path. The low count suggests incumbents are not yet protecting the motor-charger interface in marine contexts.
Search this in Eureka →How top filers differ by IPC technology route
Route coverage across the main technology branches in the current evidence set.
| Player | B60L 53 · Electric vehicle propulsion | B60L 58 · Electric vehicle propulsion | H02J 7 · Power supply & grid systems | B60L 50 · Electric vehicle propulsion | B60L 1 · Electric vehicle propulsion |
|---|---|---|---|---|---|
| Volvo Truck Corporation | Moderate · 4 | Strong · 12 | Moderate · 3 | Moderate · 6 | Moderate · 6 |
| GM Global Technology Operations LLC | Strong · 5 | Strong · 4 | Strong · 3 | Strong · 4 | Emerging · 1 |
| Caterpillar Inc. | Strong · 8 | Moderate · 2 | Strong · 5 | Absent | Absent |
| Thermo King Corporation | Absent | Moderate · 2 | Absent | Absent | Strong · 9 |
| Ningbo Geely Automobile Research & Development Co., Ltd. | Strong · 5 | Absent | Strong · 5 | Absent | Absent |
| Brunswick Corporation | Strong · 5 | Absent | Strong · 3 | Moderate · 2 | Absent |
| Zhejiang Geely Holding Group Co., Ltd. | Strong · 5 | Absent | Strong · 5 | Absent | Absent |
Frequently asked questions
The evidence covers 102 patent families in scope globally, reflecting a field that emerged at meaningful scale only around 2019–2021 and has grown 81% on a multi-year basis.
GM Global Technology Operations LLC leads with 15 patent families, closely followed by Volvo Truck Corporation with 14. Both are classified as new entrants by recent momentum data, meaning their portfolios are heavily weighted toward recent filings.
The lifecycle is classified as Growth, with annual filings still rising and 81% multi-year expansion. The apparent dip in 2025 data is attributable to patent-publication lag and should not be read as a real decline.
The United States is the leading filing office, followed by Europe via the EPO and international PCT filings through WIPO. India appears as a fourth jurisdiction. Marine-heavy markets such as Norway and Japan are not explicitly represented in the current evidence.
The only documented co-filing relationship is between Zhejiang Geely Holding Group and Ningbo Geely Automobile Research and Development Co., with 5 jointly filed patent families. This is an intra-group coordination rather than a cross-industry alliance.
B63H (Marine propulsion and steering) and B63B (Ships and marine vessels) each show only 6–7 patent records despite being the most directly relevant marine-specific classes. H02K (Electric motors and generators) similarly shows only 6 records, suggesting the motor-charger interface in marine contexts is not yet well protected by incumbent filers.
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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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