PEEK Coating & Film Patents: Leaders, Trends & White Space 2026
- 47 families total, a small, tightly bounded corpus where individual filings carry outsized weight in the ranking.
- Activity peaked in 2025 at 9 filings, after a flat stretch through the early 2020s rather than a steady climb.
- C08J and C08L dominate the IPC mix, while filtration (B01D) and fibre (D01F) branches are filed far less often.
A narrow, foundational corpus
Polyetheretherketone (PEEK) coating and film patents form a small, specialised corpus: 47 families across a search window running from 2015 to the middle of 2026. The earliest and most-cited records — dating back to processes for dissolving PEEK in high-boiling polar solvents to cast film and hollow-fibre membranes — still anchor the field’s citation graph decades on. That concentration of citations in older records is a normal feature of a mature sub-domain: it signals foundational influence, not that the technology itself has stopped moving.
Filing activity has not grown steadily. The trend shows a flat-to-declining midpoint around 2022 before a peak of 9 filings in 2025, the most recent full year in the dataset. Because publication typically lags filing by around 18 months, the 2026 count understates true recent activity and should not be read as a slowdown on its own.
Filing trend and technology composition
The dataset covers 47 published families and documents filings, receiving offices and IPC composition rather than granted claim scope. Read the trend alongside the publication lag noted above.
A flat trend punctuated by a 2025 peak
Filings sit at zero in 2017, stay flat through the 2022 midpoint, then rise to a peak of 9 in 2025. This is not a growth curve; it reads more like episodic renewed interest than sustained expansion, and the partial 2026 year should be treated as incomplete.
Concentration in polymer processing and compositions
C08J (polymer processing and solutions) and C08L (polymer compositions) each appear in roughly two-thirds of records, confirming that most filings address how PEEK is formed into film or coated, not new base polymer chemistry. B29C shaping and B01D separation/filtration each appear in a minority of records, and D01F fibre-specific claims are rarer still — a sign that membrane and fibre applications are less contested than film and coating formation itself.
Shares are the percentage of the 47 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Polyetheretherketone Coating and Film with Eureka
This page is one run against one query. Ask Eureka your own question about polyetheretherketone coating and film and every answer comes back with the patent numbers behind it.
Try EurekaThe records that anchor the citation graph
Biaxially stretched PEEK film with controlled thickness and heat shrinkage
The representative record describes a method for preparing biaxially stretched polyetheretherketone film from an amorphous PEEK precursor, using a first roll-stretching step below the glass transition temperature and a second stretching step above it, aimed at achieving precise thickness control, insulating properties and low heat shrinkage.Filed via PCT and granted in the early 1990s, this record sits at the origin of the biaxial-stretching approach to PEEK film that later filings in this corpus continue to reference.
View full filing| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4957817A | Film, fiber, and microporous membranes of poly(etheretherketone)dissolved in high boiling point polar organic… | 72 |
| 2 | EP0407684A1 | Process for the preparation of microporous film or hollow fibre membranes from polyetheretherketones dissolve… | 20 |
| 3 | WO2014060591A1 | Osteoconductive coating of implants made of plastic | 17 |
| 4 | JP1989283127A | Polyether ether ketone film and its manufacture | 17 |
| 5 | JP1988256422A | Manufacture of polyether ether ketone film | 12 |
| 6 | JP1992101827A | Manufacture of biaxially oriented polyether ether ketone film | 10 |
| 7 | WO2009147417A1 | High performance, high temperature wire or cable | 9 |
| 8 | EP2290001A1 | Use of engineering polymer compositions for the manufacture of high performance films | 7 |
| 9 | JP1988004934A | Preparation of polyether ether ketone film | 6 |
| 10 | EP2290001B1 | Use of engineering polymer compositions for the manufacture of high performance films | 5 |
Citation counts reflect influence within this searched corpus and skew toward older filings; they are not a measure of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once family counts, IPC composition and citation weight are read together.
A small field where single filings move the ranking
With only 47 families in the entire corpus, one or two additional filings by a single assignee can shift its position in the ranking noticeably. Treat any ranking here as a snapshot of a thin field, not a stable market-share figure.
Flat activity followed by a late peak
The midpoint year 2022 recorded no filings against the trend baseline, and the corpus only picked up again toward 2025. That pattern is more consistent with episodic renewed interest — possibly tied to a specific application push — than with continuous R&D investment.
Processing and composition claims crowd out fibre and filtration
C08J and C08L together dominate the technology mix, while D01F (fibre features) and B29L (plastic products index) each sit at only 7-8 records. Film and coating formation is the contested ground; fibre-specific and filtration-specific claim space is comparatively open.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to polyetheretherketone coating and film, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| PAGLIUCA ANTONIO | CASWELL ANDREW | 2 |
| Mitsui Chemicals, Inc. | SARUWATARI MASUMI | 1 |
| Mitsui Chemicals, Inc. | OKADA KAZUNARI | 1 |
| Mitsui Chemicals, Inc. | OHTA YASUHIKO | 1 |
| Mitsui Chemicals, Inc. | MATSUMURA SHUJI | 1 |
| Tyco Electronics UK Ltd. | PAGLIUCA ANTONIO | 1 |
| Tyco Electronics UK Ltd. | CASWELL ANDREW | 1 |
Only 7 co-assignee pairs appear across the entire corpus, and the strongest pairing recurs just twice — most work here is filed by a single assignee rather than through joint development.
A dispersed assignee base with no dominant recent filer
Recent-year momentum data shows every tracked assignee at zero filings in the latest year, including established chemical manufacturers and materials specialists. That flatness, combined with the corpus's small size, points to a field where incumbents hold legacy positions rather than actively expanding them right now.
Europe leads filing office activity, narrowly
The EPO accounts for the largest share of receiving-office activity at 11, followed closely by China and Japan at 9 each. WIPO/PCT and US filings trail behind, suggesting applicants are prioritising European and Asian protection over broad PCT-first strategies.
Joint filings are the exception, not the rule
Across the whole corpus only 7 co-assignee pairs exist, and none recurs more than twice. This is a field of largely independent filers rather than one shaped by joint ventures or cross-licensing consortia.
No assignee shows active recent filing momentum
Every assignee tracked for recent-year momentum, including Dow, Mitsui Chemicals and Tyco Electronics UK, registered zero filings in the latest tracked year, with at least one showing a -100% year-on-year drop. Given publication lag, this likely understates true 2025-2026 activity, but it does confirm no single player is currently pulling ahead.
| Assignee | Recent year | YoY |
|---|---|---|
| Dow Chemical Company | 0 | — |
| Mitsui Chemicals, Inc. | 0 | — |
| Tyco Electronics UK Ltd. | 0 | — |
| Tokuyama Corporation | 0 | — |
| Foshan Dafu New Material Co., Ltd. | 0 | -100% |
| GERBER THOMAS | 0 | — |
| Solvay Advanced Polymers, L.L.C. | 0 | — |
| Solvay Specialty Polymers USA, LLC | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio strategy or technical scouting.
Check freedom-to-operate against the cited foundational filings
The most-cited records in this corpus, including the solvent-casting and biaxial-stretching filings, still shape claim scope decades later. Any new film or coating process should be checked against these before drafting.
Run a claim comparison in EurekaMap the under-claimed branches before drafting
Filtration, fibre reinforcement and osteoconductive coating applications carry noticeably fewer filings than core film and composition claims, which is where new claim scope is more likely to be granted cleanly.
Explore white space in EurekaTrack momentum, not just rank
With every assignee showing zero recent-year filings, the next real signal will be whoever files first as publication lag closes. Set up monitoring rather than relying on the current snapshot.
Set up assignee monitoring in EurekaCommon questions on PEEK film and coating patents
The most-cited record in this corpus, US4957817A, covers film, fibre and microporous membranes made by dissolving PEEK in high-boiling-point polar organic solvents, and it is followed closely in citation weight by a related European filing on the same solvent-casting process. Mitsui Toatsu Chemicals also holds an early and heavily referenced filing on biaxially stretched PEEK film. These older filings still anchor the citation graph, which means any new film-forming process should be checked against them even though they predate most of the recent filing activity.
Based on the filing trend, activity is flat rather than growing: the midpoint year 2022 shows no filings, and the corpus only picks back up to a peak of 9 filings in 2025. That is not a steady expansion curve. Because publication lags filing by roughly 18 months, the apparent drop in the most recent year is likely an artefact of that lag rather than a genuine slowdown, so it is worth revisiting this trend once later filings publish.
Recent-year momentum data shows every tracked assignee, including Dow, Mitsui Chemicals, Tyco Electronics UK and Tokuyama, at zero filings in the latest tracked year. That flatness reflects the corpus's small size — only 47 families total — more than any real absence of interest, and it means no single company currently holds a clear recent-filing lead. Any assessment of "who is active" should be paired with monitoring going forward rather than relying on the historical ranking alone.
The IPC composition shows heavy concentration in C08J polymer processing and C08L polymer compositions, with far fewer records in D01F fibre features, B29L plastic products, and B01D separation processes. Wear-resistant coating additive packages and osteoconductive implant coatings also appear only sparingly relative to core film-forming claims. These lower-density branches are the more promising areas to search for open claim space before drafting a new application.
Rarely. The dataset records only 7 co-assignee pairs across the entire 47-family corpus, and the strongest recurring pairing appears just twice. Most filings in this field come from a single assignee working independently rather than through joint ventures, cross-licensing arrangements or shared research programmes, which is a smaller collaborative footprint than in many adjacent polymer sub-fields.
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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.