Silicone Elastomer Design Optimization Patents: Trends & White Space 2026
- Filing has cooled since its 2018 peak. 12 families published that year against a flat midpoint of 4 in 2022, and the trend has not recovered.
- The corpus sits outside pure materials science. The largest IPC blocks are A61K medicinal preparations (43) and A61P therapeutic activity (22), ahead of C08L polymer compositions (18).
- Citation weight concentrates in electrophoretic display pigments. US7170670B2 alone carries 1,416 citations, far ahead of any polymer-formulation record in the same set.
What this landscape actually covers
The search combines silicone elastomer, silicone rubber and polysiloxane terms with formulation- and part-design optimization language, and the 110 families it returns skew toward applications rather than base chemistry. Filing offices lead with the United States (39) and Europe (21), with WIPO/PCT filings (17) suggesting a subset of applicants are still building multi-jurisdiction coverage even as overall volume declines. The IPC mix is the tell: A61K and A61P together outweigh C08L and C08G combined, meaning much of this corpus treats silicone/polysiloxane chemistry as a delivery or formulation vehicle for pharmaceutical and cosmetic actives rather than as a structural elastomer problem on its own.
That composition matters for anyone benchmarking against this set: a claim built purely around durometer or cure-profile tuning for mechanical parts is competing against a much smaller slice of the 110 families than the headline count suggests, and the strongest citation signals sit in an adjacent field (electrophoretic display pigments) rather than in elastomer part design itself.
Filing trend and technology composition
Publication counts, IPC subclass distribution and receiving-office mix for the 110 families in this dataset, covering 2015 through the 2026-07-31 cut-off.
A peak in 2018, then a flat decline
Filings rose to 12 in 2018 before settling near a midpoint of 4 by 2022; 2026 is a partial year and should not be read as zero activity. Given the roughly 18-month lag between filing and publication, the last one to two years of this trend will fill in further as more records publish.
Medicinal and therapeutic classes dominate the mix
A61K (43) and A61P (22) together account for more than half the classified records, ahead of the polymer-focused C08L (18) and C08G (14) subclasses, with G02F optical control (20) and C09B dyes/pigments (14) marking the electrophoretic-display cluster that also drives the citation counts.
Shares are the percentage of the 110 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Silicone Elastomer Design Optimization with Eureka
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Try EurekaThe most-cited record and what it protects
US20190203051A1 — Pigments for electrophoretic displays (E Ink Corporation, 2019-07-04)
A polysiloxane-substituted quinacridone pigment is produced by reacting a quinacridone pigment with an epoxy-terminated polysiloxane so the epoxy group bonds the polysiloxane to the quinacridone nitrogen via a hydrocarbon linker bearing a hydroxyl group alpha or beta to that nitrogen. The resulting pigments are used in electrophoretic displays.The claim scope is narrow and application-specific: it covers a defined polysiloxane-to-pigment bonding chemistry for display pigments, not silicone elastomer formulation or part design generally.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7170670B2 | Electrophoretic medium and display with improved image stability | 1,416 |
| 2 | US20020180687A1 | Electrophoretic medium and display with improved image stability | 529 |
| 3 | WO2002079869A1 | Electrophoretic medium with improved image stability | 140 |
| 4 | US20120225943A1 | Detergents capable of cleaning, bleaching, sanitizing and/or disinfecting textiles including sulfoperoxycarbo… | 83 |
| 5 | WO2020023612A1 | Systems and methods for producing gene therapy formulations | 54 |
| 6 | US20100021519A1 | Compositions and Methods for Treating or Preventing Diseases of Body Passageways | 36 |
| 7 | US8871807B2 | Detergents capable of cleaning, bleaching, sanitizing and/or disinfecting textiles including sulfoperoxycarbo… | 29 |
| 8 | US20070148697A1 | Methods and system for high throughput screening of polymer materials for medical devices | 27 |
| 9 | WO2007127488A1 | Compositions and methods for treating or preventing diseases of body passageways | 20 |
| 10 | WO2011112875A2 | Foamable formulation | 19 |
Citation counts reflect activity inside this searched corpus and favour older filings; treat them as a signal of influence, not of current technical relevance.
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Three patterns stand out once the IPC composition and filing trend are read together: an application skew toward pharma/cosmetics delivery, a citation base anchored in an adjacent display technology, and a filing curve that has not recovered since 2018.
Volume has not sustained its 2018 peak
The dataset peaked at 12 published families in 2018 and had fallen to a midpoint of 4 by 2022, with no clear rebound visible before the current partial year. That pattern is more consistent with a niche that was explored and then narrowed than one still attracting new entrants.
Most of the corpus is formulation, not elastomer mechanics
A61K and A61P records together outnumber the combined C08L and C08G polymer-composition classes, indicating that silicone/polysiloxane chemistry in this set is frequently a carrier or delivery mechanism for active compounds rather than the subject of structural part design.
Influence is anchored in electrophoretic display pigments
The two most-cited records, both tied to electrophoretic display media, carry citation counts an order of magnitude above the next tier. That concentration reflects an adjacent, earlier-established display-technology lineage rather than current elastomer design activity.
US filings lead, but PCT activity signals multi-market intent
United States filings (39) lead Europe (21), with 17 WIPO/PCT filings suggesting that at least some applicants pursued broader jurisdictional coverage even as the overall filing count declined after 2018.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to silicone elastomer design optimization, with the prior art for and against each one.
Who is filing, and where momentum has stalled
Recent-year momentum across the tracked assignees shows zero new filings in the latest year for every name in this set, consistent with the broader flat-to-declining trend since 2018.
No assignee shows current-year momentum
Every tracked assignee in this dataset, including E Ink, Lubrizol, Colgate-Palmolive, Voyager Therapeutics, Ecolab and SHPP Global Technologies, registers zero filings in the latest year. That is consistent with the overall filing decline rather than a single company pulling back.
Collaboration is concentrated around one inventor cluster
The strongest co-assignee pairs all involve the same lead inventor, Singh Jagat, paired separately with Newsam John M, King Smith Dominic and Galer Bradley S, each pairing appearing five times. That points to a single research group driving most of the collaborative filing in this dataset rather than a broad industry-wide partnership pattern.
Display-technology filers form a distinct cluster
The G02F and C09B classes point to a cluster of filers working on electrophoretic display pigments and optical control, a use case adjacent to, but distinct from, elastomer part design or durometer tuning.
| Assignee | Recent year | YoY |
|---|---|---|
| E Ink Corporation | 0 | — |
| Lubrizol | 0 | — |
| Colgate-Palmolive | 0 | — |
| Voyager Therapeutics | 0 | — |
| Ecolab USA | 0 | — |
| SHPP Global Technologies | 0 | — |
| Honeywell International | 0 | — |
| SINGH JAGAT | 0 | — |
Where to take this analysis
The dataset points to a corpus split between pharma/cosmetics delivery formulations and a smaller structural-elastomer cluster. The next steps depend on which side of that split a given filing strategy sits on.
Map the structural-elastomer subset separately
Pull the C08L/C08G-classed records apart from the A61K/A61P majority to see whether durometer- and cure-profile-specific claims form a tighter, more actionable landscape than the full 110-family set suggests.
Explore this subset in EurekaCheck freedom to operate around the display-pigment cluster
Given the citation concentration around electrophoretic display pigments, any polysiloxane-pigment bonding chemistry should be checked against that lineage before drafting new claims.
Run a freedom-to-operate search in EurekaWatch for filing recovery past the 2022 midpoint
With 2026 still a partial year, track whether filings recover from the 2022 midpoint of 4 or continue the post-2018 decline once late-publishing families appear.
Set up trend alerts in EurekaCommon questions about this landscape
Filing activity in this dataset peaked at 12 published families in 2018 and had fallen to a midpoint of 4 by 2022, with no visible recovery through the most recent full year. Because publication typically lags filing by around 18 months, the last one to two years in any such trend will always look thinner than they eventually turn out to be, so a true read on 2025-2026 activity will only be clear once those records finish publishing. Based on the data available now, this is a flat-to-declining niche rather than a growing one.
The tracked assignees in this dataset include E Ink, Lubrizol, Colgate-Palmolive, Voyager Therapeutics, Ecolab and SHPP Global Technologies, but none of them show filings in the latest tracked year. The strongest collaboration signal is a single inventor cluster around Singh Jagat, who co-files repeatedly with three separate named co-inventors. This is a fragmented field rather than one with a dominant, actively-filing leader.
The search terms combine silicone/polysiloxane chemistry with formulation-optimization language, and a large share of the resulting corpus uses polysiloxane as a delivery vehicle or carrier rather than as a structural elastomer. That shows up directly in the IPC composition, where A61K (medicinal preparations, 43 records) and A61P (therapeutic activity, 22 records) outnumber the polymer-composition classes C08L (18) and C08G (14) combined. Anyone benchmarking pure elastomer part-design claims should filter this corpus down to the polymer-composition subclasses before drawing conclusions.
This filing, assigned to E Ink Corporation, claims a specific chemistry in which a quinacridone pigment is reacted with an epoxy-terminated polysiloxane so the polysiloxane bonds to the pigment through a hydrocarbon linker carrying a hydroxyl group near the quinacridone nitrogen. It is narrowly scoped to pigments used in electrophoretic displays, not to silicone elastomer formulation or mechanical part design generally. It is also the source of the dataset's representative record and sits within the highly-cited display-pigment cluster, so it is a useful marker for that adjacent field rather than a blocking reference for structural elastomer work.
The thinnest filing density relative to the breadth of the search terms sits in durometer-gradient part design, cure-profile optimization aimed at mechanical rather than pharmaceutical outcomes, and polysiloxane carrier chemistries used outside pigment or display applications. These branches sit adjacent to the dense A61K/A61P and G02F/C09B clusters but are not well represented within them. A first claim in this space would need to establish structural or mechanical performance criteria explicitly, distinguishing it from the delivery-formulation framing that dominates the existing corpus.
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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.
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