Fluid-Power Systems Patents: Top Companies & Filing Trends 2026
- No single company dominates. the leader holds 72 records against 2,386 in scope, and the top 5 combined account for just 10.2% of the field.
- Filing is still climbing. 2021-to-2024 filings rose 18%, from 28 to 33, and 2024 is the last year the trend can be read as complete.
- One IPC branch carries a fifth of the field. F15B fluid-pressure actuators and systems appears in 20.0% of all 2,386 records, well ahead of drilling-related E21B at 14.6%.
Filing growth compares 2021 (28 records) with 2024 (33) — 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 2,386 records in scope (CR5), not by the ranked leaders only.
What the fluid-power systems patent record actually shows
Fluid-power systems patenting spans hydraulic and pneumatic actuation, pressure circuits, and the mechanical components — valves, seals, gearing — that make a fluid circuit do work reliably. The 2,386 records in scope run from 2015 through the 2026 cut-off and cover filings built around fluid actuator, pressure circuit, and shaft seal claim language layered onto core fluid-power system architectures. The dataset draws from oilfield drilling equipment, off-highway vehicle hydraulics, and industrial pump and valve gear alike, which is why earth-drilling classes sit alongside vehicle-brake and steering classes in the composition figures.
Reading the assignee ranking and IPC composition together gives a more useful picture than either alone: a fragmented ownership structure paired with heavy concentration in one or two IPC branches usually means the core mechanism is well claimed but the systems-integration layer around it is not.
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Filing trend and technology composition
Two views of the same 2,386-record dataset: how filings have moved year over year, and which IPC subclasses carry the claim volume today.
Filing trend, 2017–2026
Filings ran from 31 in 2017 to a peak of 48 in 2019, then settled into a steadier band; the 2021-to-2024 span shows 18% growth, from 28 to 33 records. 2025 and 2026 figures are still incomplete because publication typically lags filing by around 18 months, so the apparent drop toward 2026's 5 records should not be read as a slowdown.
Technology composition by IPC subclass
F15B (fluid-pressure actuators and systems) leads at 20.0% of all 2,386 records, followed by E21B (earth and rock drilling) at 14.6% and F04B (positive-displacement pumps) at 9.7%. Because a single record can carry several IPC classes, these shares add up to more than 100% and should be read against the full record total, not against each other as a closed pie.
Shares are the percentage of the 2,386 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Fluid-Power Systems Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about fluid-power systems patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaA representative early filing and the most-cited records
Vibration-free hydraulic power system (US4221155A)
A vibration-free hydraulic power system having an opposing pair of pistons adapted to be moved in unison with the same stroke and equal force, but in opposite directions, one of the pistons being operatively connected to an external mass to be moved, the other of the pistons being operatively connected to a reactive mass the weight of which is identical to the weight of the mass being moved, the reactive mass acting to maintain the system in an equilibrium state during its complete operating cycle, the system incorporating a pair of control valves each having a series of sequentially acting valve elements which control fluid flow to and from the system.Filed by Ongaro Dynamics, Ltd., this 1980 filing predates the 2015-onward scope of the main dataset but its opposing-piston, counterbalanced-mass architecture is the kind of foundational mechanical claim that later fluid-actuator filings have to work around.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20080190989A1 | Endoscopic plication device and method | 1,593 |
| 2 | US20150224845A1 | Active vehicle suspension system | 700 |
| 3 | US5947051A | Underwater self-propelled surface adhering robotically operated vehicle | 391 |
| 4 | US6536520B1 | Top drive casing system | 341 |
| 5 | US6109372A | Rotary steerable well drilling system utilizing hydraulic servo-loop | 280 |
| 6 | US5303775A | Method and apparatus for acquiring and processing subsurface samples of connate fluid | 249 |
| 7 | US5377755A | Method and apparatus for acquiring and processing subsurface samples of connate fluid | 239 |
| 8 | US20040040707A1 | Well treatment apparatus and method | 234 |
| 9 | US4781023A | Wave driven power generation system | 226 |
| 10 | US5473939A | Method and apparatus for pressure, volume, and temperature measurement and characterization of subsurface for… | 219 |
Citation counts inside a searched corpus tend to favour older filings simply because they have had more time to accumulate citations — treat this as a signal of influence within the corpus, not of current technical importance.
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Browse MCP servers →What the concentration and composition figures mean for filing strategy
The ownership and technology patterns point to a field that is claim-dense in its core mechanisms but fragmented at the level of who owns those claims.
Ownership is fragmented, not cornered
The leading assignee holds 72 records and the top 5 combined reach only 10.2% of the 2,386 records in scope — the top 10 add up to 16.5%. That leaves a long tail of single- and few-filing entrants, which means no one company's claim set forecloses the field; freedom-to-operate work has to check many smaller portfolios rather than one dominant one.
Activity is building, not cooling
Filings grew from 28 in 2021 to 33 in 2024, and 2024 is the most recent year that can be read as a complete data point. The apparent decline into 2025 and 2026 reflects publication lag rather than falling interest — a fact worth stating once because later charts will show the same tapering tail.
Actuator and circuit claims dominate the core
F15B fluid-pressure actuators and systems appears in a fifth of all 2,386 records, roughly 5.4 points ahead of the next class, E21B earth and rock drilling. Positive-displacement pumps (F04B, 9.7%) and gearing (F16H, 6.0%) trail well behind, suggesting the actuator and pressure-circuit mechanics are the most heavily claimed layer of the stack.
Filing is US-centred with a real international tail
The United States receives the largest share of filings at 1,075 records, with Europe (EPO), the United Kingdom, Canada, WIPO/PCT and Australia each contributing meaningful volume. That spread points to applicants pursuing multi-jurisdiction protection rather than filing domestically only, which matters when scoping a freedom-to-operate search.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to fluid-power systems patent landscape, with the prior art for and against each one.
Assignee landscape: a fragmented field with no single gatekeeper
The ranked assignee list covers 100 companies by record count. It is not a top-50 or top-100 filter on the whole field — it is the full ranking the dataset returns — and even at its head, no company approaches a controlling share.
The single largest filer still holds a minority share
The top-ranked assignee's 72 records look substantial in isolation but represent a small fraction of the 2,386 records in scope, reinforcing that this is a multi-player field rather than one shaped by a dominant portfolio holder.
The ranking thins out quickly past the leader
Fifth place holds 35 records and tenth place holds 28 — a steep enough drop that the top 10 combined still only reach 16.5% of all records. Below that, filing counts fall into single and low-double digits across a long tail of entrants.
Momentum has cooled among the largest historical filers
Several of the largest historical assignees show zero or one filing in the latest tracked year, with year-on-year momentum flat or down for the ones that do report a change. That is consistent with the general publication-lag effect near the data cut-off rather than necessarily a strategic pullback.
| Assignee | Recent year | YoY |
|---|---|---|
| Parker Hannifin Corp | 1 | 0% |
| Caterpillar Inc | 0 | — |
| Baker Hughes Co | 0 | — |
| ClearMotion Inc | 0 | -100% |
| Weatherford Lamb, Inc. | 0 | — |
| Cascade Corporation | 0 | — |
| Halliburton Energy Services Inc | 0 | — |
| Western Atlas International Inc | 0 | — |
Where to take this analysis
The figures above establish the shape of the field; the next step is usually to narrow from record-level composition to claim-level detail on the branches that matter for a specific filing or freedom-to-operate question.
Map claim scope on the under-claimed branches
Shaft-seal wear compensation and emission-sensor integration show thinner filing density than the core actuator classes — worth a closer claim-by-claim read before assuming the space is open.
Explore in Eureka →Track the mid-field for acquisition or licensing signals
The steep drop-off between the leader and fifth place, and the long tail below tenth, suggests smaller portfolio holders may be open to licensing or consolidation rather than defending broad positions alone.
Run an assignee deep-dive in Eureka →Common questions about fluid-power systems patents
The leading assignee in this dataset holds 72 records out of 2,386 in scope, which is the largest single share but still a small fraction of the field. The top 5 assignees combined reach only 10.2% of all records, and the top 10 reach 16.5%. In practice this means ownership is spread across a long tail of companies rather than concentrated in one or two dominant filers, so a freedom-to-operate review needs to look well beyond the largest names.
Filing volume grew 18% between 2021 and 2024, rising from 28 to 33 records, and 2024 is the most recent year that can be treated as a complete data point. Counts appear to drop sharply in 2025 and 2026, but that reflects the roughly 18-month lag between filing and publication rather than an actual decline in activity. Anyone judging momentum from this dataset should anchor on the 2021-to-2024 trend rather than the final one or two years shown.
F15B, covering fluid-pressure actuators and systems, is the densest single IPC subclass, appearing in 20.0% of all 2,386 records. E21B (earth and rock drilling) follows at 14.6% and F04B (positive-displacement pumps) at 9.7%. Because records often carry more than one IPC class, these figures should be read as independent shares of the same 2,386-record base, not as slices of a single pie that sums to 100%.
Relative to the dense F15B actuator and E21B drilling classes, branches such as shaft-seal wear compensation, emission-sensor integration into hydraulic circuits, and blade-passage flow geometry show comparatively thin filing density in this dataset. That does not guarantee freedom to operate — it means fewer records carry those specific claim elements, which is a starting point for a deeper claim-level search rather than a conclusion in itself. Multi-valve sequencing logic and pressure-circuit fault diagnostics are similarly worth a closer look before assuming the space is crowded.
US4221155A, assigned to Ongaro Dynamics, Ltd. and filed in 1980, claims a vibration-free hydraulic power system built around a pair of opposing pistons of matched mass and stroke, one driving the external load and the other acting as a counterbalancing reactive mass, controlled by sequentially acting valve elements. It predates the 2015-onward scope of the main dataset, so it will not appear in the filing-trend charts, but its counterbalanced-piston architecture is the kind of foundational mechanical claim that later fluid-actuator filings often have to design around or explicitly distinguish from in their own claim language.
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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.