Pneumatic Actuator Sealing Patents: Leaders & Filing Trends 2026
- Filing has cooled, not grown. activity peaked in 2018 at 7 families and has since flattened, with the most recent full year showing no net gain over the 2022 midpoint.
- The core claim space is narrow and cited hard. the most-cited record in the set carries 129 citations versus 30-84 for the next tier, meaning a small number of early rod-and-piston seal constructions still anchor examiner reasoning today.
- Rail and robotics pull the IPC mix outward. B61C (locomotives) and B25J (manipulators) each register alongside the core F15B/F16J classes, showing sealing claims are increasingly written around specific end-use platforms rather than generic cylinders.
Top-5 share is the combined record count of the five largest assignees divided by all 74 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families at the intersection of pneumatic actuators, cylinders and air actuators with sealing-specific claim language — piston seals, rod seals, low-friction seals and sealing technology generally — filtered to the core mechanical IPC classes for pistons, seals and gaskets (F16J15/16, F16J15/32) and fluid-pressure actuator systems (F15B15/14). It spans filings from 2015 through the 2026 data cut-off, covering 74 published families.
Because publication lags filing by roughly 18 months, the last one to two years in any trend view will look thinner than they eventually turn out to be; treat the most recent year as a floor, not a ceiling.
Filing trend and technology composition
Two views of the same 74-family dataset: how filing volume has moved year over year, and how those families distribute across the IPC classes that touch pneumatic sealing.
Filing trend, 2015-2026
Filings rose to a peak of 7 in 2018, held near that level through the early 2020s, and sit at a flat-to-declining midpoint of 4 by 2022. Read the final one to two bars as undercounted given publication lag rather than as evidence of a sharp drop-off.
IPC subclass composition
F15B (fluid-pressure actuators) and F16J (pistons, seals & gaskets) dominate, together accounting for the large majority of records, consistent with a search built around actuator-plus-seal claim language. The smaller counts in B61C, F16F, B23Q, B25J, B24B and F01B mark the platforms — rail, robotics, machine tools, reciprocating engines — where sealing claims get re-filed against a specific mechanical context rather than a generic cylinder.
Shares are the percentage of the 74 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Pneumatic Actuator Sealing Technology with Eureka
This page is one run against one query. Ask Eureka your own question about pneumatic actuator sealing technology and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art anchoring this space
Single-Acting Pneumatic Cylinder for Use on a Locomotive Platform
The pneumatic cylinder includes a cylinder body, a non-pressure head, a hollow piston rod, a piston head, and a push rod. The cylinder body has a mounting flange and an inlet port. The non-pressure head has a mounting flange. The hollow piston rod has an open end and a closed end. The piston head is secured to the hollow piston rod and defines the closed end of the hollow piston rod. The push rod has a socket end inserted within the hollow piston rod and a coupler end. The non-pressure head has a hollow rod guide bearing and a hollow rod seal and the piston head has a piston guide bearing and a piston seal. The hollow rod guide bearing and the hollow rod seal each slidably engage the hollow…Abstract truncated to the portion relevant to sealing claims.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6439103B1 | Hydraulic and pneumatic cylinder construction | 129 |
| 2 | US5015000A | Floating seal arrangement | 84 |
| 3 | US5169160A | Lubricating seal for pneumatic cylinder | 55 |
| 4 | US6050541A | Pneumatic valve actuator assembly | 34 |
| 5 | US5241896A | Pneumatic cylinder apparatus | 30 |
| 6 | US5079997A | Piston seal device for a pneumatic cylinder | 30 |
| 7 | US4428276A | O-Ring seal for piston of double-acting fluid pressure cylinder | 25 |
| 8 | US20090007770A1 | Pneumatic cylinder for precision servo type applications | 16 |
| 9 | JP1986062604A | Pneumatic cylinder device | 14 |
| 10 | US20020170426A1 | Pneumatic cylinder for railroad track switch operator | 11 |
Citation counts are drawn from a searched corpus and skew toward older filings; treat them as a measure of influence on later drafting, not as a signal of which patents remain commercially relevant today.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three signals worth acting on before drafting or clearing a new sealing design.
Growth is flat, not accelerating
Filing peaked in 2018 and has not returned to that level since. A midpoint value of 4 in 2022 against a 2018 peak of 7 points to a mature, occupied claim space rather than an expanding one.
No single office dominates prosecution
Japan and the United States each account for 13 records, with Europe, China, Canada and the UK all in the single digits behind them. Clearance work needs to span at least these two offices to be complete.
A handful of early constructions still anchor the field
The leading record's citation count is more than four times the third-ranked record's, meaning drafting language in this space still routes back through a small number of foundational rod-and-piston-seal patents.
Rail and vibration-damping are secondary filing lanes
Locomotive platforms (B61C) and springs/vibration dampers (F16F) each carry 10 records, roughly a third of the core F16J volume, indicating sealing claims are being re-filed against specific mechanical platforms rather than left generic.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to pneumatic actuator sealing technology, with the prior art for and against each one.
Who is filing, and where the gaps sit
Recent-year momentum across the leading assignees is uniformly flat: every name in the top tier shows zero filings in the latest tracked year, consistent with the overall plateau in the trend data. That does not mean the field is inactive — it means recent filings have not yet cleared publication lag, and the field's competitive structure was set earlier in the window.
Wabtec Holding Corp.
Holds the representative record for locomotive-platform pneumatic cylinders and appears in the dataset's only identified co-assignee pairing, suggesting active joint development on rail-specific sealing hardware even as new filings have slowed.
METROL SPRINGS
A specialist components name in the ranking, positioned around spring and seal hardware adjacent to the core F16J claim class rather than full actuator assemblies.
Moog Controls Ltd.
Filing activity sits alongside Moog's broader actuation portfolio; like the rest of the top tier, it shows no filings in the latest tracked year, in line with the dataset-wide plateau.
Parker Hannifin Manufacturing Germany GmbH & Co. KG (Parker Hannifin Manufacturing Germany)
One of several Parker Hannifin entities present in the ranking, reflecting a large incumbent's spread of sealing IP across multiple corporate filing entities and jurisdictions.
| Assignee | Recent year | YoY |
|---|---|---|
| Wabtec Holding Corp. | 0 | — |
| METROL SPRINGS | 0 | — |
| Moog Controls Ltd. | 0 | — |
| Rexroth Mecman Ltd. | 0 | — |
| FerRobotics Compliant Robot Technology GmbH | 0 | — |
| Parker Hannifin Manufacturing Germany GmbH & Co. KG | 0 | — |
| HUMPHREY PRODUCTS CO | 0 | — |
| Korea Institute of Science and Technology (KIST) | 0 | — |
Where to take this
The dataset points to a mature, occupied core with narrower openings at the edges. Two directions follow from that.
Map claims against the platform-specific classes
B61C, B25J, B24B and F01B each carry meaningfully fewer records than the F15B/F16J core, which is where a new sealing design is more likely to find open claim territory rather than crowded prior art.
Explore white space in EurekaTrack the flat-to-declining trend before committing R&D spend
With filings at a plateau since roughly 2018-2022, a first-filer in an adjacent platform class carries less risk of running into a recently active competitor than filing directly against the F16J core.
Run a filing-trend check in EurekaCommon questions about this landscape
The core classes are F16J15/16 and F16J15/32, which cover pistons, seals and gaskets, together with F15B15/14 for fluid-pressure actuator systems. In this dataset those two IPC subclasses (F15B and F16J) account for the large majority of the 74 tracked families. Related claims also surface in platform-specific classes such as B61C for locomotives, B25J for manipulators, and F16F for springs and vibration dampers, where sealing hardware is claimed against a specific end use rather than a generic cylinder.
The dataset's assignee ranking is led by names spanning rail equipment, industrial components and large hydraulics/pneumatics incumbents, including Wabtec Holding Corp. on the rail side and multiple Parker Hannifin entities on the industrial side. No single assignee shows filing activity in the most recent tracked year, which reflects the field-wide plateau rather than any one company exiting the space. Freedom-to-operate work should still check each of these names individually, since their portfolios were built earlier in the 2015-2026 window.
Filing activity peaked in 2018 at 7 families and has not returned to that level since, with a 2022 midpoint of 4 pointing to a flat-to-declining trend rather than growth. Because publication typically lags filing by around 18 months, the final year or two in any count will understate true activity, so the apparent slowdown should be read cautiously for the most recent period. Overall, though, the multi-year pattern is consistent with a mature claim space rather than an expanding one.
US6439103B1, "Hydraulic and pneumatic cylinder construction," is the most-cited record in this dataset at 129 citations, more than four times the count of the third-ranked record. That level of citation density indicates it is treated as foundational prior art by examiners searching this claim area, meaning new filings on rod-and-piston-seal constructions are likely to be checked against it. It is a citation-influence signal, not a statement that the patent itself remains commercially central today.
The thinner IPC classes in this dataset — B25J (manipulators), B24B (grinding/polishing), B23Q (machine-tool fittings) and F01B (reciprocating machines) — each carry only a handful of records compared to the F15B/F16J core. That gap suggests sealing designs built specifically for robotic, machine-tool or reciprocating-engine platforms are less crowded than generic pneumatic cylinder seals. A freedom-to-operate search focused on those overlaps is a reasonable starting point before committing to a new design direction.
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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.