Hydraulic Actuator Patents: Who Leads, Where Filings Stall 2026
- Filing has gone flat, not up. activity peaked at 11 families in 2021 and the count at the 2022 midpoint sits at the same level, so scale-up filing is plateauing rather than accelerating.
- Machine-tool codes outweigh actuator codes. B23Q machine-tool fittings account for the largest single IPC bucket (49 records), ahead of F15B fluid-pressure actuators (38) — the manufacturing tooling around the cylinder is claimed more heavily than the cylinder itself.
- China dominates the filing base. 52 of the tracked receiving-office filings are Chinese, more than the United States, Japan, India, the UK and EPO combined.
Filing growth compares 2021 (11 records) with 2024 (6) — 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 111 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks patent families at the intersection of hydraulic actuator and cylinder hardware and the manufacturing processes used to build them at volume — automated machining, assembly-line integration and mass-production tooling. The search combines actuator-specific terms with manufacturing-process language and restricts to IPC codes covering fluid-pressure actuators, machine-tool fittings and metalworking, so the corpus is deliberately narrow: it is not general hydraulics, it is the scale-up and production-engineering layer sitting on top of it.
Coverage runs from 2015 through the 2026 cut-off, with 111 published records forming the basis of the assignee ranking. Because publication typically lags filing by around 18 months, the most recent one to two years in any trend read lower than they will eventually settle.
Filing trend and technology mix
Two views of the same 111-family corpus: how filing volume has moved year over year, and which IPC subclasses carry the claim weight.
A peak in 2021, then a plateau
Filings rose from 3 in 2017 to a peak of 11 in 2021. The 2022 midpoint holds at 11, and the trajectory from there is flat to declining rather than growing — this is a maturing filing pattern, not an emerging one, though the final 2025-2026 counts will revise upward as late publications land.
Machine-tool and metalworking codes lead
B23Q (machine tool fittings) is the single largest bucket at 49 records, ahead of F15B (fluid-pressure actuators, 38) and B23P (metal working generally, 31). Smaller counts sit in turning/boring, sawing, sheet-metal working, clutches/brakes and motor-vehicle steering — evidence that most of the documented invention is happening in how actuators get made, not in the actuator's fluid-pressure design itself.
Shares are the percentage of the 111 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Hydraulic Actuator Scale-Up and Mass Production with Eureka
This page is one run against one query. Ask Eureka your own question about hydraulic actuator scale-up and mass production and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
Hydraulic cylinder, particularly slave cylinder for a hydraulic clutch actuating system for motor vehicles
A hydraulic cylinder for a hydraulic clutch actuating system for motor vehicles has a piston subassembly with a piston and piston rod, a cylinder housing in which a pressure chamber is variably bounded at one side by the piston and fixedly bounded at the other side by a base of the cylinder housing. A spring element is arranged at the side of the piston opposite from the pressure chamber and is supported at one end on a spring plate on the housing side and operatively connected at the other end with the piston rod so as to bias the piston subassembly in a direction away from the base. A fixing section fixes the piston subassembly in a predetermined stroke setting with respect to the cylinder.Filed by FTE Automotive GmbH, published 2017-02-09 — a compact slave-cylinder design for automotive clutch actuation, illustrative of the mechanical-subassembly claims common in this space.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN2593951Y | 楔块式自动定心夹具 | 21 |
| 2 | US6615478B2 | Process for assembling a vehicle chassis by inversion | 18 |
| 3 | US7228997B1 | Nailing chuck | 16 |
| 4 | US6141861A | Apparatus and method for control of roller chain assembly | 15 |
| 5 | CN201461590U | 一种管件液压成形用分段式密封头机构 | 14 |
| 6 | JP1988022228A | Press-fitting assembly system using robot | 13 |
| 7 | CN104588748A | 一种新型铣扁口加工机床 | 11 |
| 8 | CN2832415Y | 支架拉床夹具 | 11 |
| 9 | US20030106202A1 | Vehicle chassis inverter and process for assembling a vehicle chassis by inversion | 11 |
| 10 | JP1991223510A | Hydraulic cylinder | 9 |
Citation counts inside a searched corpus skew toward older records simply because they have had longer to accumulate citations — read this as a signal of technical influence, not of current commercial relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-throughs from the filing trend, the IPC split and the citation table that matter for where you file next.
Growth has stalled, not started
Filings climbed from 3 in 2017 to a peak of 11 in 2021, and the 2022 count sits at the same 11. That is a flat-to-declining curve at the exact point where a genuinely emerging technology would still be accelerating. Treat this as a maturing niche where the core mechanical claims are largely staked out, with the openings left being process and integration detail rather than fundamental cylinder architecture.
Tooling claims outweigh actuator claims
Machine-tool fittings (B23Q) carry more records than fluid-pressure actuators and systems (F15B), with general metalworking (B23P) close behind. The heaviest patenting activity is around how cylinders and actuators get machined and assembled at volume, not around new actuator physics — a useful signal for teams assuming the open ground is in the hydraulics.
The filing base has shifted east
China accounts for more receiving-office filings than the United States, Japan, India, the UK and EPO combined. Freedom-to-operate work for manufacturing partners or licensees in Asia needs to weight Chinese utility-model and invention filings heavily rather than treating them as a secondary check after US/EP searches.
Filing here is mostly solo, not joint
Only two co-assignee pairings appear across the corpus, and the strongest link involves a university paired with a materials manufacturer. Most activity comes from single entities filing independently rather than through joint ventures or cross-licensed development programmes, which affects how much freedom-to-operate risk sits with any one counterparty.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hydraulic actuator scale-up and mass production, with the prior art for and against each one.
Who is filing, and where the field is still open
Recent-year momentum across the tracked assignees shows a common pattern for a plateauing niche: named leaders with zero filings in the latest tracked year, alongside a long tail of single- or few-filing entrants.
Named leaders have gone quiet
Every assignee surfaced in the recent-momentum view — spanning an equipment maker, an automotive supplier, a university and an industrial manufacturer — shows zero filings in the latest tracked year. That is consistent with the flat overall trend and suggests current activity, if any, has not yet published rather than having stopped outright, given the 18-month publication lag.
University-industry pairing is the exception
The single strongest collaboration link pairs a university with a metal-alloy materials manufacturer, appearing twice. A second, weaker pairing links an automotive OEM with a heavy-industry conglomerate. Neither reaches the scale of a formal joint filing programme — most families in this corpus carry a single named assignee.
China is the largest single filing venue
China's 52 receiving-office filings sit well ahead of the United States (19), Japan (13), India (6), the UK (5) and EPO (4). Any assignee planning a manufacturing footprint or licensing deal touching Chinese suppliers should treat the Chinese filing base as primary prior art, not supplementary.
| Assignee | Recent year | YoY |
|---|---|---|
| Caterpillar Inc. | 0 | — |
| FTE Automotive GmbH | 0 | — |
| Mazda Motor Corporation | 0 | — |
| Mahindra & Mahindra Ltd. | 0 | — |
| Qingdao University of Technology | 0 | — |
| Amsted Industries Incorporated | 0 | — |
| Hyundai WIA Corporation | 0 | — |
| Shenzhen Zhongan Power Technology Co., Ltd. | 0 | — |
Where to take this analysis
The landscape points to specific next steps depending on whether you are clearing a design or scoping a filing strategy.
Run a freedom-to-operate check on B23Q claims
With machine-tool fittings carrying the largest single IPC count in this corpus, any new cylinder-manufacturing line should be checked against B23Q claims before tooling is finalised, not after.
Explore in EurekaWatch for the 2025-2026 publication catch-up
The flat trend from 2021-2022 partly reflects the 18-month publication lag; revisit the trailing two years once later filings have published to confirm whether the plateau holds.
Track this topic in EurekaPrioritise Chinese prior art in any clearance search
China's 52 receiving-office filings outweigh every other jurisdiction tracked here combined, so a clearance search that starts with US/EP art and treats China as secondary will miss the largest filing base.
Search Chinese filings in EurekaCommon questions about this landscape
This landscape tracks 111 published patent families filed between 2015 and the 2026 data cut-off, using a search that combines hydraulic actuator and cylinder terminology with manufacturing-process language and a focused set of IPC codes covering fluid-pressure actuators, machine-tool fittings and metalworking. That figure is specific to this search scope, not to hydraulics or actuators generally, so a broader query on either term alone would return a larger and less focused set. Because publication lags filing by roughly 18 months, the true 2025-2026 count will be somewhat higher once later filings publish.
Filing activity is flat to declining rather than growing. It rose from 3 records in 2017 to a peak of 11 in 2021, and the 2022 midpoint holds at the same level of 11, which is not the shape of an accelerating technology. This pattern is typical of a maturing niche where the core mechanical claims are already staked out and remaining activity concentrates on process refinement rather than fundamental redesign. The final one to two years of any trend chart will revise upward slightly as late-published filings catch up.
The tracked assignee set includes equipment manufacturers, automotive suppliers, universities and industrial manufacturers, but every one of them shows zero filings in the latest tracked year according to the recent-momentum data. That does not necessarily mean these organisations have stopped filing — it more likely reflects the normal publication lag combined with an overall plateau in the field. Rather than a single dominant leader, the corpus shows concentration among a handful of named filers alongside a long tail of single-filing entrants, which is worth confirming directly against the assignee ranking table on this page.
The densest claim territory sits in machine-tool fittings (B23Q, 49 records), fluid-pressure actuator systems (F15B, 38) and general metalworking (B23P, 31). Sub-areas with visibly fewer records — sheet-metal cylinder-housing forming, clutch-actuator brake integration, automated turning of cylinder rods, bore-finishing via broaching or sawing, and steering-actuator hydraulic integration — carry noticeably lower filing density and are worth a targeted prior-art check before assuming they are open. Lower density is a starting signal, not proof of freedom to operate, so it needs confirming against the full claim text of nearby filings.
China represents 52 of the receiving-office filings tracked in this corpus, more than the United States (19), Japan (13), India (6), the UK (5) and EPO (4) combined. This concentration is consistent with China's role as a high-volume manufacturing base for machine tools and mechanical components, where utility-model filings are common for incremental process and tooling improvements. Anyone assessing freedom to operate for a manufacturing partner, supplier or licensee with Chinese operations should treat Chinese-language filings as a primary search target rather than a secondary check performed after US and European art.
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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.