Active Suspension Bogie Patents: Leaders & Filing Trends 2026
Filing growth compares 2021 (172 records) with 2024 (77) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 2,454 records in scope (CR5), not by the ranked leaders only.
What the active suspension bogie filing record shows
Active suspension bogie technology sits at the intersection of railway running gear and vehicle suspension engineering: systems that actively control ride height, damping or lateral stiffness on a bogie rather than relying on passive springs alone. The 2,454 patent families captured here span the core running-gear class (B61F) through to brakes, traffic control and electric propulsion classes that a working bogie system inevitably touches. Filing concentration is real but not extreme — a handful of transport-equipment majors and rail research institutes hold a meaningfully larger share than any single newcomer, yet the ranked field extends to 100 distinct assignees.
Reading the trend line requires care. Publication typically lags filing by around 18 months, so the most recent one to two years in any chart will always understate real filing activity — a fact that matters here because the raw numbers taper sharply after 2022.
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Filing trend and technology composition
Two views of the same 2,454-record corpus: the year-by-year filing curve, and the IPC subclasses that these records fall under. Because a single record can carry several classes, the class shares add up to more than the record total — that is expected and does not indicate double-counting.
Filing activity, 2017-2026
Filings rose from 97 in 2017 to a peak of 240 in 2022, then fell — 2021's 172 declined to 77 by 2024, a 55% drop over that three-year window. 2025 and 2026 figures are still filling in under the usual publication lag and should not be read as a continuing collapse.
Technology composition by IPC subclass
B61F (railway running gear & bogies) covers 32.9% of the 2,454 records, well ahead of vehicle suspension (B60G, 10.4%) and motor vehicle steering (B62D, 9.5%). Brakes, traffic control and electric propulsion classes each sit near or just above 5%, reflecting how often active-suspension claims are bundled with adjacent subsystem claims rather than filed in isolation.
Shares are the percentage of the 2,454 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Rolling Stock & Bogies: Active Suspension Bogie Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about rolling stock & bogies: active suspension bogie patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaA representative claim and the most-cited prior art
System for the secondary suspension of a superstructure of a rail vehicle having an active spring element
Describes a hydropneumatic spring unit with a suspension accumulator acting as an active spring element, placed between a rail vehicle's superstructure and the bogie beneath it. The system maintains a raised travelling level during operation and, via level control, can also lower the superstructure to a station platform level — tying active suspension directly to platform-height accessibility.Filed by Knorr-Bremse Systeme fur Schienenfahrzeuge; granted 2007-01-30.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20100253519A1 | Underdeck carrier system for mobile containers for segregating product types in common shipment | 181 |
| 2 | US20100116566A1 | Maneuvering Robotic Vehicles Having A Positionable Sensor Head | 148 |
| 3 | US5583844A | Programming device and method for controlling ride vehicles in an amusement attraction | 135 |
| 4 | US20120242142A1 | Track Assembly for Traction of a Vehicle | 126 |
| 5 | US6120009A | Shock strut with managed damping and force characteristics | 122 |
| 6 | US5074624A | Bogie vehicle with electrohydraulic brakes and hydropneumatic suspension | 109 |
| 7 | US20180067003A1 | Conduction-path-equipped member, method for patterning conduction path, and method for measuring changes in m… | 107 |
| 8 | US20070044676A1 | Guideway activated magnetic switching of vehicles | 107 |
| 9 | WO2001083702A2 | Novel members of the lysyl oxidases family of amine oxidases related applications | 96 |
| 10 | US20130147205A1 | Integrated energy generating damper | 89 |
Citation counts favour older documents simply because they have had longer to accumulate citations inside this searched corpus — treat this table as a signal of influence on the field's prior art, not a ranking 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 numbers mean for a filing decision
Three findings that shape where a new filing is likely to clear examination cleanly, and where it will land in dense prior art.
The top of the field is concentrated but not closed
Five assignees combined hold 575 of 2,454 records — meaningful concentration, but the ranked list still runs to 100 distinct companies. A new entrant is not filing into a duopoly; it is filing into a market with one identifiable leader (200 records) and a long, active tail below fifth place (45).
The 2022 peak has unwound, but the picture is incomplete
Filings fell from 172 in 2021 to 77 in 2024 after peaking at 240 in 2022. That is a real pullback in documented activity, not an artefact — but 2025-2026 figures are still incomplete under the usual 18-month publication lag, so the current trajectory should not be read as a straight-line decline.
Adjacent vehicle classes are thinly claimed relative to the core
B61F alone covers 32.9% of records, but B60G (vehicle suspension, 10.4%) and B62D (motor vehicles & steering, 9.5%) sit far lower despite being natural crossover territory for active suspension control logic. That gap is where claim space is comparatively open.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to rolling stock & bogies: active suspension bogie patent landscape, with the prior art for and against each one.
Where to take this next
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio benchmarking or identifying open claim space.
Map claim boundaries around the top assignees
With 23.4% of records held by five companies, a freedom-to-operate check should start with those portfolios' independent claims before broadening to the full ranked field.
Explore assignee portfolios in EurekaWatch the 2025-2026 filings as they resolve
The apparent post-2022 decline is still partly a publication-lag artefact. Re-running this analysis in twelve months will clarify whether filing activity has genuinely settled below the 2021-2022 level.
Track filing trends in EurekaProbe the B60G and B62D crossover space
Vehicle suspension and steering classes are filed far less densely than core B61F running-gear claims, despite technical overlap — a candidate area for a first-mover filing.
Run a white space search in EurekaCommon questions about active suspension bogie patents
This dataset captures 2,454 published patent families matching active suspension bogie search criteria, filed between 2015 and mid-2026. Filing activity rose steadily to a peak of 240 records in 2022, then declined to 77 by 2024. The 2025-2026 figures are still incomplete because publication typically lags filing by around 18 months, so the true recent-year total is higher than currently shown.
The ranked field covers 100 distinct assignees, led by a single company holding 200 records, with the fifth-ranked assignee at 45 and the tenth at 29. The top five combined hold 23.4% of all 2,454 records in scope, indicating real but not extreme concentration — there is a substantial tail of smaller filers below the leaders, including national rail research institutes and transport-equipment manufacturers.
Filing activity peaked in 2022 at 240 records and declined afterward, with 2021's 172 falling to 77 by 2024 — a 55% drop over that three-year span. However, because publication lags filing by roughly 18 months, the 2025 and 2026 figures shown in any dataset are necessarily incomplete, so this should be read as a documented pullback from a 2022 peak rather than a confirmed multi-year decline into the present.
Railway running gear and bogies (IPC class B61F) is the dominant class, covering 32.9% of the 2,454 records in scope. Vehicle suspension (B60G, 10.4%) and motor vehicle steering (B62D, 9.5%) are the next largest, followed by railway brakes, traffic control and electric propulsion classes each near 5%. Because records often carry multiple IPC classes, these shares add up to more than 100% of the corpus.
The clearest gap sits between the dominant B61F running-gear class and the comparatively thin B60G and B62D classes, which cover related suspension and steering control logic but at less than a third of the filing density. Sub-areas such as active lateral stiffness control, bogie-integrated steering linkages and platform-height level control logic show lower filing density than the core running-gear claims, suggesting room for narrowly drafted claims that have not been heavily contested yet.
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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.