Hydraulic Actuator Lightweight Design Patents: Leaders & Trends 2026
- Filing has gone flat, not up. Activity peaked in 2019 at five filings and has since drifted back toward the low single digits — this is a mature, not an accelerating, filing area.
- No dominant assignee has emerged. The strongest co-filing link in the dataset is a single pair of related Caterpillar entities, and every tracked assignee shows zero filings in the latest year — a genuinely fragmented field.
- Claims cluster tightly around F15B. 38 of 41 records sit in fluid-pressure actuator classification, with composite shaping (B29C) and aerospace (B64C) as much thinner secondary bands.
Filing growth compares 2021 (2 records) with 2024 (0) — 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 41 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families at the intersection of hydraulic actuator, hydraulic cylinder and servo-hydraulic terminology with claim-level language around lightweight cylinder, composite actuator, weight reduction and topology optimization, filtered to fluid-pressure actuator, composite-shaping and CAD/simulation classification codes. It captures 41 published records spanning 2015 through the mid-2026 data cut-off.
Because publication typically lags filing by around 18 months, the most recent one to two years in any trend line will understate actual filing activity — treat the tail of the chart as provisional, not as a real decline.
Filing trends and technology composition
Two views of the same 41-family dataset: how filing volume has moved year over year, and which classification codes carry the claim weight.
A flat-to-declining filing curve
Filings rose to a peak of five records in 2019, fell back toward the midpoint value of one filing in 2022, and show no rebound through the most recent complete years. This is not a hot filing area by volume; it is a narrow, persistent niche that a handful of specialists keep filing into.
Concentrated in fluid-pressure actuators, with composite and aerospace tails
F15B (fluid-pressure actuators & systems) accounts for 38 of the 41 records — nearly the entire dataset. F16J (pistons, seals & gaskets) and B29C (shaping of plastics) form the next tier, and small counts in B64C (aeroplanes & helicopters), B66C (cranes & hoists), B60P, E21D and B23K show the technology reaching into aerospace, materials-handling and underground-support equipment without any of those branches building real depth.
Shares are the percentage of the 41 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Hydraulic Actuator Lightweight Design with Eureka
This page is one run against one query. Ask Eureka your own question about hydraulic actuator lightweight design and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this space
US5787793A — Hydraulic cylinder and assembly method thereof (KYB Corporation, 1998)
A hydraulic cylinder designed to reduce part count for cost and weight reduction while still fully performing its sealing function, using a cylinder tube, a piston, a rod, a bearing supporting the rod, a tubular cylinder head, and seals mounted against the rod on the cylinder head's inner circumferential surface, with a cylindrical recess of enlarged radius formed at the tube's front end.Filed by KYB Corporation; granted 1998 — now well outside its original enforcement window but still a foundational citation anchor for part-count-reduction cylinder designs.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5415079A | Composite cylinder for use in aircraft hydraulic actuator | 35 |
| 2 | CN103727092A | 一种碳纤维复合材料液压缸 | 16 |
| 3 | US4831920A | Ballistically tolerant actuator | 16 |
| 4 | US20060213363A1 | Valve for hydraulic props of shield-type support frames, and shield-type support frame | 11 |
| 5 | US7428861B2 | Valve for hydraulic props of shield-type support frames, and shield-type support frame | 8 |
| 6 | WO1993023675A1 | Composite cylinder for use in aircraft hydraulic actuator | 8 |
| 7 | EP0640186B1 | Composite cylinder for use in aircraft hydraulic actuator | 7 |
| 8 | US20180023704A1 | Cylinder, cylinder device, and working vehicle | 6 |
| 9 | US20150226329A1 | Hydraulic cylinder made of hybrid composite laminate, in particular for high-power applications | 6 |
| 10 | EP3260705A1 | Cylinder, cylinder device, and working vehicle | 5 |
Citation counts inside a searched corpus favour older records by construction — read this table as a map of influential prior art, not of current competitive activity.
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-outs from the filing, classification and citation data that matter for deciding where to file or license next.
The niche has cooled, not disappeared
Volume never reached double digits in any single year across the whole 2015–2026 window. That low absolute base means individual filings carry disproportionate weight in shaping what counts as prior art here.
Claim density sits almost entirely in one subclass
Fluid-pressure actuator classification dominates so heavily that the secondary IPC codes — B29C, B64C, B66C — look more like adjacent applications than competing technical routes.
Composite-cylinder aerospace art still anchors the field
The single most-cited record is a 1990s composite cylinder for aircraft hydraulic actuators — decades old but still the reference point that later filings cite around, alongside a cluster of shield-support hydraulic-prop valve patents.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hydraulic actuator lightweight design, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Caterpillar Inc. | Caterpillar Global Mining Europe GmbH | 2 |
The strongest co-assignee link in the entire dataset is a single pair of related Caterpillar entities filing twice together — there is no meaningful joint-development network to map.
Assignee landscape: fragmented, no current leader
Every assignee tracked in the recent-momentum data shows zero filings in the latest year, and the strongest co-filing relationship in the dataset is a single related-entity pair — this is a field of occasional, independent filers rather than a small set of repeat leaders.
No assignee is currently active
Every named assignee in the momentum data — from KYB-adjacent cylinder specialists to composite-actuator firms — shows no filings in the most recent tracked year, consistent with the broader flat-to-declining trend.
Caterpillar's two entities are the only real cluster
Caterpillar Inc. and its Caterpillar Global Mining Europe subsidiary are the only co-assignee pair with more than a single shared filing, and even that link is modest at two records.
US and Europe lead office coverage
The United States receives the largest share of filings, followed by the European Patent Office and China, with Australia, Canada and Japan each holding smaller counts — a spread that suggests global rather than single-market enforcement intent among filers.
| Assignee | Recent year | YoY |
|---|---|---|
| HR Textron Inc. | 0 | — |
| Schwan | 0 | — |
| B.F. Goodrich Company (USA) | 0 | — |
| Tadano Ltd. | 0 | — |
| SHPAC | 0 | — |
| RI BA COMPOSITES S R L CON UNICO SOCIO | 0 | — |
| Aisin Seiki Co., Ltd. | 0 | — |
| Caterpillar Inc. | 0 | — |
Where to take this analysis
The filing and classification data point to a narrow, low-volume niche with one dominant IPC cluster and no active leader — the next questions are about defensibility and design-around options.
Map the F15B claim boundaries in detail
With 38 of 41 records in a single subclass, understanding exactly which cylinder and seal geometries are already claimed is the first step before drafting new applications.
Explore F15B claim scope in Eureka →Track the under-claimed branches
Composite shaping, aerospace actuators and crane/hoist applications each show thin but present filing activity — worth monitoring for early movers before volume builds.
Set up monitoring in Eureka →Assess the KYB and composite-cylinder prior art
The highest-cited records anchor much of the field's vocabulary; checking freedom-to-operate against them before filing is a reasonable first move.
Run a freedom-to-operate check in Eureka →Common questions about this landscape
This dataset tracks 41 published patent families filed between 2015 and the mid-2026 data cut-off, matched against terminology like hydraulic actuator, hydraulic cylinder and servo-hydraulic combined with claim language around lightweight cylinder, composite actuator, weight reduction and topology optimization. That is a genuinely small corpus compared to mainstream hydraulics fields, which is itself informative: it signals a specialised sub-niche rather than a mainstream research area. Filing peaked at five records in a single year (2019) and has not returned to that level since.
No single assignee currently dominates this space. Every assignee tracked in the recent-momentum data shows zero filings in the latest year, and the only notable co-filing relationship is between Caterpillar Inc. and its Caterpillar Global Mining Europe subsidiary, who share two records. Historically cited names such as KYB Corporation appear as foundational prior art rather than as currently active filers.
Based on the tracked years, filing is flat to declining rather than growing. The peak was five filings in 2019, the 2022 midpoint sits at just one filing, and there is no rebound visible through the most recent complete years. Keep in mind that publication lags filing by roughly 18 months, so the very latest years in the chart will always look thinner than they eventually turn out to be — but the multi-year trend before that lag window is genuinely flat.
F15B (fluid-pressure actuators and systems) dominates, covering 38 of the 41 records in this dataset. F16J (pistons, seals and gaskets) and B29C (shaping of plastics) form a secondary tier, reflecting composite and sealing approaches to weight reduction. Smaller counts in B64C (aerospace), B66C (cranes and hoists), B60P, E21D and B23K show the technology being applied in adjacent equipment categories without deep claim coverage there yet.
US5787793A, assigned to KYB Corporation, covers a hydraulic cylinder design that reduces part count specifically to cut cost and weight while preserving full sealing performance, using a defined cylinder tube, piston, rod, bearing, cylinder head and seal arrangement with a specific enlarged-radius recess geometry. Because it granted in 1998, its original enforcement window has long passed, but it remains a heavily cited reference point that later filers design around or build on. Anyone working on part-count-reduction cylinder architectures should read its specific structural claims closely, since its terminology still shapes how later applications in this space are drafted.
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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.