Silicone Elastomer Composite Reinforcement Patents: Leaders & Trends 2026
- Filing has cooled since its 2017 peak. 17 filings that year against a 2022 midpoint of just 7, with no clear recovery through the most recent complete year — this is a mature, not a growing, claim space.
- C08L and C08K dominate the IPC mix. 250 and 239 records respectively, well ahead of tyre-specific B60C at 93 — reinforcement chemistry, not any single end use, is where the claim density sits.
- Named large assignees show zero filings in the latest year. Bridgestone, Goodyear, Dow Silicones, GE, Saint-Gobain Abrasives and Michelin all register 0 in the most recent year tracked — active filing has shifted away from the historically dominant names.
What this landscape covers
This dataset tracks 436 patent families published between 2015 and mid-2026 that combine silicone elastomer or polysiloxane chemistry with a reinforcement mechanism — silica, filler, or fiber reinforcement of the composite matrix. The search string deliberately spans silicone rubber, silicone elastomer and polysiloxane language paired with reinforcement terms, so it captures both general-purpose silicone compounding work and application-specific composite claims.
Filing offices skew toward the United States and the EPO, with Japan, Canada and Germany making up a smaller but consistent share — evidence that this is a chemistry filed for global commercial protection rather than a regionally confined niche. Publication lags filing by roughly 18 months, so the apparent decline in the most recent year is partly an artefact of that lag rather than a definitive stop in activity.
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Filing trend and technology mix
Two views of the same 436-family corpus: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
Filing trend: a 2017 peak, then decline
Filings peaked at 17 in 2017 and fell to a 2022 midpoint of 7, with the most recent year tracking near zero — consistent with a technology area where core compounding chemistry has already been claimed and remaining activity is incremental.
IPC composition: compounding chemistry leads
C08L (polymer compositions, 250 records) and C08K (polymer additives, 239) dominate the corpus. B60C (pneumatic tyres, 93) confirms tyres as the largest single end-use pull, but C08J, C08F, B29C, C08G and C09C together show reinforcement claims spread across processing, monomer chemistry and pigment/filler treatment rather than concentrated in one application.
Shares are the percentage of the 436 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Silicone Elastomer Composite Reinforcement with Eureka
This page is one run against one query. Ask Eureka your own question about silicone elastomer composite reinforcement and every answer comes back with the patent numbers behind it.
Try EurekaA representative claim and the most-cited prior art
Liquid Addition-curable Silicone Composition for Fiber-reinforced Composite Material
Shin-Etsu Chemical's filing covers a liquid addition-curable silicone composition combined with reinforcing fiber, molded into parts with heat resistance and strength suited to aircraft, spacecraft, satellite, electronics, construction and automotive structural members exposed to high operating temperatures.Filed by SHIN-ETSU CHEMICAL CO., LTD., published 2008-11-06 — illustrates how early fiber-reinforced silicone composite claims were framed around aerospace and automotive structural end uses.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20100210745A1 | Molecular Healing of Polymeric Materials, Coatings, Plastics, Elastomers, Composites, Laminates, Adhesives, a… | 717 |
| 2 | US5312377A | Tapered luer connector | 407 |
| 3 | US20100233146A1 | Coatings and Surface Treatments Having Active Enzymes and Peptides | 317 |
| 4 | US20110240064A1 | Polymeric Coatings Incorporating Bioactive Enzymes for Cleaning a Surface | 292 |
| 5 | US20120097194A1 | Polymeric Coatings Incorporating Bioactive Enzymes for Catalytic Function | 250 |
| 6 | US20110250626A1 | Visual Assays for Coatings Incorporating Bioactive Enzymes for Catalytic Functions | 206 |
| 7 | WO2009155115A2 | Coatings and surface treatments having active enzymes and peptides | 174 |
| 8 | US5499976A | Catheter retainer | 170 |
| 9 | US20150191607A1 | Anti-fouling Paints and Coatings | 166 |
| 10 | US20070259994A1 | Elastomers Reinforced with Carbon Nanotubes | 124 |
High citation counts here reflect age and breadth of the underlying enzyme-coating and connector families, not current commercial relevance — treat citation rank as a signal of influence within the searched corpus, not of present-day importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once families are read alongside the IPC and trend data.
Core chemistry claims are largely settled
The drop from a 2017 peak of 17 to a 2022 midpoint of 7, with the most recent tracked year near zero, points to a claim space where the foundational silicone-plus-filler compositions are already staked out. New filings now compete against a dense prior-art base rather than open ground.
Compounding chemistry, not end use, is the crowded layer
C08L and C08K together account for the bulk of records, well ahead of application-specific classes like B60C. Anyone filing a new reinforcement composition should expect the composition claims themselves to face the densest prior art, regardless of target application.
The historical leaders have gone quiet
Bridgestone, Goodyear, Dow Silicones, GE, Saint-Gobain Abrasives and Michelin all show zero filings in the most recent tracked year. That does not mean the technology is abandoned — publication lag means recent filings from these same companies may simply not be visible yet.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to silicone elastomer composite reinforcement, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Saint-Gobain Abrasives, Inc. | Saint-Gobain Abrasives France | 15 |
| Bridgestone Corporation | LIN CHENCHY JEFFREY | 4 |
| Compagnie Générale des Établissements Michelin | WILSON CLIFFORD | 3 |
| Bridgestone Corporation | ZHOU HAIYING | 2 |
| Bridgestone Corporation | RADEMACHER CHRISTINE | 2 |
| Bridgestone Corporation | ARAKI SUNJI | 2 |
| Bridgestone Corporation | ARAKI SHUNJI | 2 |
| Compagnie Générale des Établissements Michelin | STUBBLEFIELD RAYMOND | 2 |
Only 10 co-assignee pairs appear across the corpus, and the strongest pairing links two Saint-Gobain abrasives entities at 15 shared records — most other filers in this space patent independently rather than through joint ventures.
Who has filed, and where the gaps sit
Filing in this space concentrates among a handful of large materials and tyre manufacturers, with a long tail of single- or few-filing entrants. Recent-year momentum shows even the largest historical filers registering zero in the latest tracked year, which changes how a new entrant should read the competitive map.
Chemistry-first filers have paused, not exited
Both Dow Silicones and GE show zero filings in the most recent year tracked. Given the roughly 18-month publication lag, this likely understates true current activity, but it also means their most recent visible claims may already be several years old.
Tyre-specific reinforcement is a distinct sub-market
Bridgestone and Michelin appear among the named large assignees but also show zero latest-year filings. The B60C subclass at 93 records confirms tyres as a meaningful but secondary pull compared to general compounding chemistry.
Saint-Gobain's two abrasives entities file jointly
The strongest co-assignee pairing in the corpus links two Saint-Gobain abrasives entities at 15 shared records — the clearest example of coordinated multi-entity filing in this dataset, against a backdrop where only 10 co-assignee pairs exist in total.
| Assignee | Recent year | YoY |
|---|---|---|
| Bridgestone Corporation | 0 | — |
| Goodyear Tire & Rubber Company | 0 | — |
| Dow Silicones Corporation | 0 | — |
| General Electric Company | 0 | — |
| Saint-Gobain Abrasives, Inc. | 0 | — |
| Compagnie Générale des Établissements Michelin | 0 | — |
| Saint-Gobain Abrasives France | 0 | — |
| Honeywell Federal Manufacturing & Technologies, LLC | 0 | — |
Where to take this from here
The trend and assignee data point to specific next steps depending on whether you are clearing a product or scoping a filing.
Check the publication-lag blind spot
Zero latest-year filings from major assignees may reflect the roughly 18-month gap between filing and publication rather than a real pause — pull each incumbent's filing history directly before concluding they have exited.
Run an assignee deep-dive in EurekaMap claims against the under-claimed branches
Fiber-reinforced structural applications and filler surface-treatment claims sit outside the dense C08L/C08K/B60C core — a freedom-to-operate check here is more likely to surface open space than in the compounding chemistry itself.
Explore white space with EurekaCommon questions about this landscape
Filing volume has declined since a 2017 peak of 17 records, with a 2022 midpoint of only 7 and near-zero activity in the most recent tracked year. Because publication lags filing by roughly 18 months, some of that apparent drop is an artefact of records not yet appearing in the corpus rather than a true stop in R&D. That said, the trend is clearly flat-to-declining rather than growing, so new entrants should expect a mature rather than expanding claim space.
Large tyre and materials manufacturers including Bridgestone, Goodyear, Dow Silicones, GE, Saint-Gobain Abrasives and Michelin appear among the named large assignees in this corpus. Notably, all six show zero filings in the most recent tracked year, which may reflect publication lag rather than genuine exit. Co-filing is uncommon overall — only 10 co-assignee pairs exist across the dataset, with the strongest being two related Saint-Gobain abrasives entities.
C08L (polymer compositions) leads with 250 records, closely followed by C08K (use of additives in polymers) at 239. These two subclasses dominate the 436-family corpus, well ahead of application-specific classes like B60C (pneumatic tyres) at 93. This tells you that the densest prior art sits in the composition and additive chemistry itself, not in any single downstream product application.
The corpus shows thinner filing density outside the C08L/C08K/B60C core — specifically in fiber-reinforced silicone for aerospace structural members, filler surface treatment for pigment dispersion, addition-curable liquid silicone processing, condensation-cured polysiloxane reinforcement, and vinyl-modified addition polymer hybrids. These branches show up as secondary IPC classes (C08J, C08G, C08F, C09C) rather than as the primary composition claims, suggesting less-crowded ground for a first claim that combines reinforcement chemistry with a specific processing or application angle.
This Shin-Etsu Chemical filing, published 2008-11-06, covers a liquid addition-curable silicone composition combined with reinforcing fiber for molded composite parts targeting aerospace, automotive, construction and electronics structural components. It is a useful reference point for the fiber-reinforced silicone branch specifically, but it does not cover the broader C08L/C08K compounding chemistry that makes up most of this corpus. Anyone working near this claim should check its specific composition and cure-chemistry limitations rather than assuming it blocks silicone-reinforcement work generally.
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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.