Clutch Friction Materials Patents: Leaders, Trends & White Space 2026
- Filing peaked in 2017 and has since flattened. Five filings in the peak year fell to one at the 2022 midpoint, with the most recent full year showing no new momentum from any tracked assignee.
- Prior art concentrates hard in F16D clutches and brakes. 104 of 109 records sit in F16D, meaning almost every filing in this set claims against clutch and brake hardware first, materials chemistry second.
- Three assignees co-file repeatedly at the same intensity. The strongest co-assignee pairs each show eight joint filings, pointing to a small cluster of firms working the same claim territory together rather than in competition.
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 109 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks 109 patent families filed between 2015 and mid-2026 that claim clutch friction material compositions, friction lining constructions, or wet friction material systems, narrowed to documents that also address friction coefficient stability, thermal capacity, judder, wear rate, or paper-based friction formulations. The IPC scope spans F16D69 and F16D13 for the mechanical clutch and brake hardware, and C09K3 for the materials science side of friction compounds.
The receiving-office spread is led by the United States, followed by the United Kingdom, Japan, Europe and Canada, indicating this is a filing area with genuine multi-jurisdiction interest rather than a single-market niche. Publication lags filing by roughly 18 months, so the apparent drop-off in the most recent year understates real filing activity still working through the pipeline.
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Filing trend and technology composition
Two views of the same 109 families: how filing volume moved year over year, and which IPC subclasses carry the claim weight.
A peak in 2017, then a flat-to-declining line
Filings hit five in 2017, the high point of the window, then fell toward the midpoint year of 2022 at one filing before staying low through the most recent full years. That pattern reads as a mature, narrowly claimed field rather than one attracting fresh entrants.
F16D dominates; C09K, C08J and C08L carry the chemistry
104 of 109 records touch F16D, the clutch and brake subclass, confirming that friction material claims are almost always anchored to a mechanical device context. C09K (29), C08J (26) and C08L (21) show where the polymer and additive chemistry actually lives, while C04B, C22C and B32B remain thin, single-digit subclasses — a sign of light claim density outside the core polymer-composite approach.
Shares are the percentage of the 109 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Clutch Friction Materials with Eureka
This page is one run against one query. Ask Eureka your own question about clutch friction materials and every answer comes back with the patent numbers behind it.
Try EurekaThe prior art that everything else is filed against
Graphene-based wet friction material (US11287004B1)
A resin impregnated wet friction material that serves as the friction lining on either a clutch plate or a brake pad plate is formed as a paper matrix. The composition of the paper matrix contains graphene nanoparticles as an aid for thermal capacity and conductivity.Filed by Alto Products Corporation, granted 2022-03-29 — illustrates how additive-driven improvements to paper-based wet friction matrices are still being actively claimed within an otherwise flat filing trend.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5585166A | Friction lining | 116 |
| 2 | US5952249A | Amorphous carbon-coated carbon fabric wet friction material | 63 |
| 3 | US4119591A | Friction material reinforced with steel and cellulose fibers | 59 |
| 4 | US6142263A | Multi-layer brake element with enhanced thermal insulation | 58 |
| 5 | US6316086B1 | Friction lining for torque transmission devices | 46 |
| 6 | US7208432B1 | Friction lining for braking system components | 43 |
| 7 | US4175070A | High carbon friction material | 41 |
| 8 | US3835118A | Sponge iron friction material | 40 |
| 9 | US2784105A | Friction lining compositions | 40 |
| 10 | US6035991A | Blocked slot clutch plate lining | 37 |
Citation counts favour older documents simply by virtue of longer exposure in the corpus; treat them as a measure of influence on later claims, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Four read-throughs on what a flat trend, a concentrated IPC footprint and a short citation leaderboard mean for anyone deciding where to file next.
The field is not attracting new entrants
Filings dropped from five in the 2017 peak to zero in the most recent year across every tracked assignee, including the largest historical filers. That is consistent with a technology where the core claim space was staked out early and later work is incremental.
Claims are device-anchored, not chemistry-anchored
Almost every record in this set is classified under F16D, clutches and brakes, meaning friction material innovations are being claimed as part of a mechanical assembly rather than as standalone compound patents. That narrows freedom-to-operate analysis toward device claims first.
Old friction lining patents still anchor new claims
The most-cited record in this set, a 1990s-era friction lining patent, carries far more citations than anything filed in the last decade. New filings are still built in reference to foundational lining and carbon-fabric wet friction work rather than displacing it.
A small cluster files together repeatedly
Only four co-assignee pairs exist in this dataset, but the strongest three each show eight joint filings between the same handful of firms. That is a tight collaborative or supplier relationship, not broad industry-wide co-development.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to clutch friction materials, with the prior art for and against each one.
Assignee landscape
A short list of repeat filers dominates the historical record, but recent-year activity has gone quiet across the board — a sign this is a field to watch for reactivation rather than active land-grab.
Legacy friction and clutch specialists
Names like Bendix, Ferodo, Aisin Chemical, and the Japanese and Chinese clutch-material specialists in this set built up their filing volume earlier in the window and show no new activity in the most recent tracked year.
A tight three-way filing relationship
The three strongest co-assignee pairs all connect the same small group of entities, each pairing appearing in eight joint filings. That concentration suggests a supplier-OEM or joint-development relationship rather than arm's-length competition.
Smaller filers still push materials-level novelty
Alto Products Corporation's graphene-based wet friction material shows that novel additive chemistry inside the paper-matrix format is still being claimed even while the largest historical filers have gone quiet.
| Assignee | Recent year | YoY |
|---|---|---|
| THE BENDIX CORP | 0 | — |
| AISIN Friction Materials Co., Ltd. | 0 | — |
| Exedy Corporation | 0 | — |
| Nissan Motor Co., Ltd. | 0 | — |
| FERODO LTD | 0 | — |
| Aisin Chemical Co., Ltd. | 0 | — |
| Schaeffler Technologies AG & Co. KG | 0 | — |
| BENDIX AVIATION CORP | 0 | — |
Where to take this analysis
The filing trend and IPC map point to specific next steps depending on whether you are clearing freedom-to-operate or scouting for open claim space.
Screen the under-claimed IPC branches
C04B ceramics and C22C alloys each carry only five records in this set against 104 in F16D — worth a targeted search before assuming the space is empty.
Explore white space in EurekaWatch for reactivation, not just new entrants
A flat trend with a strong historical leaderboard often reactivates when a materials input (like graphene additives) becomes commercially viable — track the legacy filers as much as the newcomers.
Set up assignee monitoring in EurekaMap the co-filing cluster before assuming competition
The three strongest co-assignee pairs share the same entities, which changes how you read apparent multi-party activity in this space.
Run a collaboration analysis in EurekaCommon questions on clutch friction material patents
The most-cited record in this dataset is a friction lining patent from the 1990s carrying 116 citations, well ahead of the next most-cited documents on amorphous carbon-coated carbon fabric wet friction material and steel-and-cellulose-fibre reinforced friction material. These older patents are still cited heavily because they established baseline claim language that later filings reference, not because they represent the newest technology. Anyone drafting new claims in this space should expect examiners to cite these as prior art regardless of filing date.
Filing activity peaked in 2017 at five records in this dataset and has trended down since, with the 2022 midpoint showing only one filing and the most recent tracked year showing none from any named assignee. That said, publication lag of roughly 18 months means the very latest filings are not yet fully visible, so the true recent-year picture is likely understated. The overall shape is a mature field with occasional materials-driven filings, such as graphene-additive wet friction linings, rather than a growth market.
F16D covers the clutch and brake device itself and dominates this dataset at 104 of 109 records, meaning most friction material claims are drafted as part of a mechanical assembly. The underlying chemistry sits in C09K (materials for miscellaneous applications), C08J (polymer processing), C08L (polymer compositions) and C08K (polymer additives), each present at lower but meaningful volume. A freedom-to-operate search that only checks F16D will miss standalone materials claims filed under the C08 or C09 subclasses.
US11287004B1 claims a resin-impregnated wet friction material built as a paper matrix containing graphene nanoparticles, specifically for thermal capacity and conductivity improvement, used as a friction lining on a clutch plate or brake pad plate. It does not block every use of graphene in friction materials outright — it blocks the specific combination of a paper-matrix wet friction construction with graphene nanoparticles for the stated thermal purpose. Alternative binder systems, non-paper substrate formats, or graphene used for a different stated function (such as wear resistance rather than thermal conductivity) sit outside its literal claim scope, though a full claim-chart review is needed before relying on that distinction.
The thinnest IPC subclasses in this dataset are C04B (ceramics and refractories) and C22C (alloys), each carrying only five records against 104 in the core F16D subclass, suggesting ceramic-matrix and metal-alloy friction facings are under-claimed relative to polymer-composite approaches. Layered or laminate friction structures under B32B are similarly thin at four records. These branches are worth a deeper search before assuming they are open, since low record counts in a search string can also reflect narrow keyword coverage rather than a genuinely empty claim space.
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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.