Seals and Gaskets Patents: Top Companies & Filing Trends 2026
- Concentration is moderate, not extreme. The top 5 assignees hold 30.3% of all 241 records in scope, and the top 10 hold 39.0% — a leader plus a long tail rather than a single dominant filer.
- Filing has already peaked. Annual filings rose to 17 in 2022 and have not returned to that level since, suggesting the core claim space around compression set and media resistance is largely staked out.
- Drilling and wellbore sealing is a hidden second market. E21B (earth and rock drilling) appears in 12.9% of records, meaning a meaningful slice of this seals dataset is really oilfield equipment, not automotive.
What this landscape covers
This landscape tracks 241 published records filed between 2015 and 2026 that combine elastomeric seal, rubber gasket or O-ring sealing terminology with claims tied to compression set, media resistance, low-temperature sealing, explosive decompression or service life, and that fall under F16J15, C08L9 or C09K3. That combination narrows the field to sealing technology defined by its failure modes rather than by shape alone — the claims that matter when a seal has to survive thermal cycling, chemical exposure or rapid pressure drop rather than just fit a groove.
The dataset spans automotive, industrial and oilfield sealing together, because the same compression-set and media-resistance language shows up in all three. Publication for the most recent year is necessarily incomplete, since filings typically take about 18 months to reach publication, so 2026 figures understate actual filing activity.
Filing trend and technology composition
Two views of the same 241 records: how filing volume has moved year over year, and which IPC subclasses carry the claims.
Filings rose to a 2022 peak, then eased
Annual filings climbed from 6 in 2017 to a peak of 17 in 2022, then declined — a flat-to-declining pattern rather than sustained growth. Because the most recent year is only partially published, the true 2025-2026 trend will read higher once lagging filings clear the pipeline, but the multi-year plateau through the peak is real.
F16J dominates; drilling and polymer chemistry are secondary clusters
F16J (pistons, seals and gaskets) appears in 88.4% of the 241 records, confirming this is fundamentally a seal-design dataset. E21B (well drilling, 12.9%) and the polymer-composition classes C08L and C08K (10.4% and 9.5%) point to two secondary clusters: oilfield service seals and the elastomer formulations that make them work, each large enough to be a filing strategy in its own right rather than incidental overlap.
Shares are the percentage of the 241 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Seals and Gaskets for Automotive and Industry with Eureka
This page is one run against one query. Ask Eureka your own question about seals and gaskets for automotive and industry and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
GB2461891A — An elastomeric seal having high resistance to rapid gas decompression
A seal comprises an inner core comprising an elastomer with good rapid gas decompression resistance, and an outer layer on the core comprising an elastomer with chemical resistance suitable for a given operating environment. An optional bonding layer sits between the core and outer layer. The core and/or outer layer may also have low temperature flexibility such that it is flexible at temperatures below minus 10 degrees C, giving the seal chemical resistance, low-temperature flexibility and resistance to explosive decompression together. A method of manufacturing such a seal is also included.Filed by James Walker & Company Limited — a dual-layer construction is the key design choice worth studying before filing a similar seal.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6789634B1 | Self-lubricating elastomeric seal with polarized graphite | 149 |
| 2 | US5183269A | Unitized grit seal with removable thrust bumper | 89 |
| 3 | US4702657A | Self centering seal | 77 |
| 4 | US4580794A | Silicon rubber gasket and material | 64 |
| 5 | US5842701A | Dual functioning seal for rock bits | 63 |
| 6 | US4838365A | Seal assembly for rotary drill bits | 60 |
| 7 | US20060290070A1 | Reinforced elastomeric seal | 56 |
| 8 | US8312805B1 | High pressure pump piston | 50 |
| 9 | US4049856A | Gaskets | 47 |
| 10 | US4295654A | Seal assembly for a linkage | 46 |
Citation counts are drawn from a searched corpus and skew toward older filings, which have had more time to accumulate citations — read them as a signal of influence on later designs, not of current filing activity.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three findings that change where a team should look before drafting new claims in this space.
A leader plus a long tail, not a monopoly
The leading assignee holds 22 records against a field of 241, and the top 10 combined reach 39.0%. That leaves the majority of filings spread across a long tail of single- and few-filing entrants — room for a new entrant to build a position without displacing an entrenched dominant player.
The field has already plateaued
Filings grew from 6 in 2017 to a peak of 17 in 2022 before easing off. Combined with the moderate concentration at the top, this points to a technology area where the obvious claim space has largely been staked, though the incomplete 2026 data means the most recent trajectory is still uncertain.
Oilfield sealing is a distinct sub-market inside this dataset
Nearly one in eight records also carries an earth-and-rock-drilling classification, meaning explosive-decompression and media-resistance claims written for wellbore tools sit in the same search space as automotive and industrial seals. Teams benchmarking only against automotive filings will miss this cluster.
Older foundational patents still anchor the field
The most-cited record in this dataset, on a self-lubricating elastomeric seal, carries 149 citations — far ahead of the next most-cited filings. High citation counts concentrate on older patents simply because they have had longer to accumulate them, so treat this as a map of foundational influence rather than a ranking of current relevance.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to seals and gaskets for automotive and industry, with the prior art for and against each one.
Who is filing, and where the gate sits
The assignee ranking spans 100 companies across automotive, industrial and oilfield sealing, with filing spread widely enough that no single strategy dominates the field.
Front-runner without a runaway lead
The top-ranked assignee holds 22 of the 241 records in scope, roughly comparable to a strong but not overwhelming position given fifth place sits at 7 records and tenth at 3.
Established filers have gone quiet recently
Several of the historically largest assignees, including the top-ranked companies, show no filings in the latest tracked year. Given the 18-month publication lag, this may reflect pipeline delay rather than withdrawal, but it is worth confirming before assuming continued activity from any single incumbent.
China is now the largest single filing venue
China accounts for 102 of the tracked filings, ahead of the United States at 46, with Europe, the UK, Canada and WIPO PCT filings each in double digits. A landscape review that only screens US and EP filings will miss the largest single venue in this dataset.
| Assignee | Recent year | YoY |
|---|---|---|
| Smith International, Inc. | 0 | — |
| SKF USA Inc. | 0 | — |
| Caterpillar Inc. | 0 | — |
| Precision Polymer Engineering Ltd. | 0 | — |
| 伊果皮彻工业公司 | 0 | — |
| 派克汉尼芬公司 | 0 | — |
| 哈利伯顿能源服务公司(美国) | 0 | — |
| 费德罗莫格尔公司 | 0 | — |
Where to take this from here
The landscape data points to specific next checks rather than a single conclusion.
Confirm whether the 2022 peak is a true plateau
With 2026 data still incomplete, the apparent post-2022 decline needs re-checking once another 12-18 months of publications land, particularly for any assignee that shows zero recent filings.
Explore filing trends in EurekaMap the oilfield-sealing overlap separately
The E21B overlap suggests wellbore and downhole seal claims deserve their own search rather than being read as automotive white space.
Run a focused IPC search in EurekaStress-test the under-claimed branches
Low-temperature flexibility and multi-layer constructions look thin in the IPC composition, but that needs a freedom-to-operate check, not an assumption of open space.
Check freedom-to-operate in EurekaCommon questions on seals and gaskets patents
Within this dataset of 241 records, the leading assignee holds 22 filings, with the top 5 assignees together accounting for 30.3% of all records and the top 10 accounting for 39.0%. That is a moderate concentration: a clear front-runner exists, but well over half the field is spread across a long tail of smaller and single-filing entrants. Anyone benchmarking competitors should look past the top few names, since the majority of activity sits outside them.
Filing activity rose from 6 records in 2017 to a peak of 17 in 2022, then eased off in subsequent years based on published data. Because publication typically lags actual filing by about 18 months, the most recent year or two in any such trend will always look lower than the true filing rate once the pipeline clears. Even allowing for that lag, the multi-year plateau after 2022 suggests the field has moved past its fastest growth phase.
The search underlying this dataset specifically targets seals defined by failure-mode language: compression set, media resistance, low-temperature sealing, explosive decompression and service life. In practice that means the patents cluster around how a seal behaves under sustained load, chemical exposure, cold temperatures or sudden pressure loss, rather than around novel shapes or installation methods. The representative filing GB2461891A illustrates this directly, combining a decompression-resistant inner core with a chemically resistant outer layer in a single dual-layer seal.
12.9% of the 241 records also carry an E21B classification, which covers earth and rock drilling equipment. Wellbore and downhole tools rely on seals that must survive explosive decompression and aggressive media exposure — the same failure modes the search string targets — so oilfield-specific seal patents overlap heavily with automotive and industrial sealing claims. Anyone treating this as a purely automotive landscape will miss a real and separately competitive sub-market.
Based on the IPC composition, branches like low-temperature flexibility below minus 10 degrees C, multi-layer core-and-outer-layer constructions, and combined seal-bearing vibration damping (crossing F16C and F16F) appear less frequently than the dominant F16J seal classification. That thinner coverage is worth investigating as potential white space, but it should be confirmed with a targeted freedom-to-operate search rather than treated as open ground by default, since light IPC coverage can also reflect narrow claim scope rather than true absence of prior 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.