Hydraulic Actuator Vibration Damping Patents: Trends & Leaders 2026
- Filing peaked in 2018 at 20 records and has not recovered. The midpoint year, 2022, sits at 7 — this is a mature claim space, not a growing one.
- China receives more than double the filings of any other office. 119 of 279 records route through the Chinese office, ahead of the United States at 51 and Japan at 30.
- The most-cited prior art dates back decades. US4732244A and US3701499A anchor the citation graph, which signals foundational influence more than current relevance.
Filing growth compares 2021 (18 records) with 2024 (3) — 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 279 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Hydraulic actuator vibration damping sits at the intersection of fluid-pressure actuation and mechanical vibration control. The corpus tracked here spans hydraulic cylinders, servo-hydraulic drives and the damping, isolation and semi-active control mechanisms attached to them, filtered to the springs-and-dampers, fluid-actuator and active-vibration IPC groups. It captures 279 patent families published between 2015 and the middle of 2026.
Filing activity is concentrated in a small number of IPC subclasses and a handful of national offices, which makes this a good field for mapping where claim space is dense versus where it thins out. Because publication typically lags filing by around 18 months, the 2026 figure in any trend line understates real filing activity for that year.
Filing trends and technology composition
Two views of the same 279-family dataset: how filing volume has moved year over year, and how those filings distribute across IPC subclasses.
Filings rose to a 2018 peak, then flattened
Filings climbed from 6 in 2017 to a peak of 20 in 2018, then settled to a midpoint of 7 in 2022. That trajectory reads as flat-to-declining rather than a growth curve, consistent with a technology area where the core mechanisms are established and filing now tracks incremental refinement rather than a wave of new entrants.
F16F dominates; automotive and medical branches trail
F16F (springs and vibration dampers) accounts for 249 of the records, dwarfing every adjacent subclass. B60G (vehicle suspension, 48) and F15B (fluid-pressure actuators, 44) form a secondary tier, while B62D, A61F, E05F, F16M and B21B each hold single-digit-to-teens counts — evidence of damping mechanisms migrating into steering, prosthetics, doors and rolling mills, but only thinly.
Shares are the percentage of the 279 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Hydraulic Actuator Vibration Damping with Eureka
This page is one run against one query. Ask Eureka your own question about hydraulic actuator vibration damping and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art shaping this field
CA2991600C — Hydraulic damping system and articulated vehicle having such a damping system
A hydraulic damping system for damping pivoting movements between two vehicle parts connected via a pivot joint uses a double-acting hydraulic cylinder whose pressure and suction chambers are linked through a proportional pressure relief valve. The valve is configured as an electrically pilot-controlled inverse proportional relief valve that holds a nominal pressure in the de-energized state, aimed at improving damping performance while keeping the mechanism cost-effective to produce.Filed by CLAAS Industrietechnik GmbH; published 2020-03-24.
View full filing| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4732244A | Hydraulic shock damper assembly for use in vehicles | 203 |
| 2 | US3701499A | Active fluid isolation system | 153 |
| 3 | US6029764A | Coordinated control of an active suspension system for a work vehicle | 128 |
| 4 | US5899288A | Active suspension system for a work vehicle | 104 |
| 5 | US5603387A | Active vehicle suspension system | 103 |
| 6 | US5961899A | Vibration control apparatus and method for calender rolls and the like | 88 |
| 7 | US5725066A | Active tractor suspension system | 74 |
| 8 | US20080053763A1 | System and method for self-powered magnetorheological-fluid damping | 55 |
| 9 | US5800566A | Artificial joint with a hydraulic damping cylinder | 45 |
| 10 | EP0237085A1 | Hydraulic shock damper assembly for use in vehicles | 43 |
Citation counts favour older filings simply because they have had longer to accumulate citations inside this searched corpus; treat them as a measure of foundational influence, not of current commercial weight.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Reading filing volume, geography and citation age together points to a field where the foundational mechanisms are settled and activity has shifted to specific application niches.
Growth has already happened
The peak year, 2018, has not been matched since. A midpoint of 7 in 2022 confirms the field cooled well before the most recent filings, which are themselves undercounted due to publication lag.
Filing activity is China-weighted
China's receiving office accounts for well over double the volume of the next-largest office, the United States. Japan, the EPO, WIPO and the UK trail further behind, suggesting domestic Chinese demand or manufacturing is a larger driver here than global PCT strategy.
One subclass carries the field
F16F, covering springs and vibration dampers generally, touches nearly every record. The secondary subclasses — vehicle suspension and fluid-pressure actuators — show the mechanism being adapted rather than reinvented for each application.
Influence sits with older art
The most-cited records are decades-old shock damper and active suspension patents. New filers need to clear this older art before claiming anything that touches basic damper architecture.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hydraulic actuator vibration damping, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Harbin Engineering University | Jiaxing University | 1 |
The strongest co-assignee pair in the dataset — Harbin Engineering University and Jiaxing University — appears only once, indicating this field is filed by single entities rather than joint ventures or research consortia.
Who holds the claim space
Assignee activity here is historic rather than current: several of the named holders show zero filings in the most recent year, which is consistent with a field where the core architecture was claimed some years ago and momentum has since dispersed.
Foundational holders, now quiet
Names tied to the oldest, most-cited shock damper and active suspension patents show no recent filings, which tracks with the citation data — their contribution is architectural, filed once and cited for decades.
Named-inventor filings have gone cold
Several individually-attributed filings from earlier in the dataset show no recent activity, suggesting this corner of the field has shifted toward institutional and corporate assignees.
Volume concentrated at Chinese offices
With China accounting for the largest single share of receiving-office volume, and university co-filing pairs such as Harbin Engineering University and Jiaxing University appearing in the dataset, Chinese universities and manufacturers are a visible source of current filing activity even where individual assignees file only once.
| Assignee | Recent year | YoY |
|---|---|---|
| MONROE AUTO EQUIPMENT CO | 0 | — |
| CASE CORPORATION | 0 | — |
| GRAMNAS FINN | 0 | — |
| SHTEYNBERG MARK Y | 0 | — |
| Draftex Industries Ltd. | 0 | — |
| Applied Power Inc. (Actuant Group) | 0 | — |
| Dynamic Clarity Corp. | 0 | -100% |
| Aisin Seiki Co., Ltd. | 0 | — |
Turning this landscape into a filing decision
A landscape page shows where claim density sits; deciding whether to file, design around or license still requires reading the actual claim language.
Map claims against your own architecture
Run your damper or actuator design against the F16F-heavy core claims to see whether you sit inside or outside the dense prior art before drafting.
Explore claim charts in EurekaTrack the quiet assignees
Several historic holders show zero recent filings — worth confirming whether that reflects an expired portfolio or a pause before renewed activity.
Set up assignee monitoring in EurekaTest the under-claimed branches
The thin subclasses outside F16F's core — prosthetics, door gear, rolling mills — may offer real freedom-to-operate rather than just low filing counts.
Run a white-space search in EurekaCommon questions about this landscape
The dataset's most-cited records trace back to legacy automotive suppliers whose active suspension and shock damper patents from decades ago still anchor the citation graph. Several of these named assignees show no filings in the most recent year, meaning the leadership shown by citation volume is historic rather than current. Recent filing volume is more geographically distributed, with China's receiving office accounting for the largest current share, so tracking who is filing now requires looking at recent-year momentum separately from cumulative citation counts.
Filing peaked at 20 records in 2018 and has not returned to that level since; the 2022 midpoint of 7 confirms a flat-to-declining trend rather than sustained growth. This does not mean the technology is abandoned — it means the foundational mechanisms are largely claimed and current activity is incremental. As always with recent years, the most recent count is understated because publication lags filing by roughly 18 months, so 2025-2026 figures will revise upward over time.
China's receiving office leads with 119 records, more than double the United States at 51, followed by Japan at 30, the European Patent Office at 19, WIPO's PCT route at 18, and the United Kingdom at 15. This distribution suggests the bulk of current activity is oriented toward domestic Chinese manufacturing or research rather than a global PCT-first filing strategy. Anyone assessing freedom-to-operate should weight Chinese-office prior art heavily rather than defaulting to US or EPO searches alone.
CA2991600C, assigned to CLAAS Industrietechnik GmbH and published 2020-03-24, covers a hydraulic damping system for articulated vehicles where a double-acting hydraulic cylinder's pressure and suction chambers are connected through an electrically pilot-controlled inverse proportional pressure relief valve that holds a nominal pressure when de-energized. It is a representative example of how the field's F16F-heavy core claims specific valve architectures rather than the general concept of hydraulic damping. Anyone designing a similar articulated-vehicle damper should check whether their valve control scheme falls inside this specific pilot-control arrangement.
The IPC composition shows F16F carrying 249 of 279 records, while adjacent applications — vehicle steering, prosthetic implants, door and window operators, support frames, and metal rolling — each hold only single-digit-to-teens counts. That gap indicates the core damping mechanism is heavily claimed but its application into those adjacent branches is not, which is where a first-filer is more likely to find open claim space. Confirming this requires a direct claim-language search in those subclasses rather than relying on volume counts alone.
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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.