Polyimide Film Patents: Top Companies & Filing Trends 2026
Polyimide Film Manufacturing Patents: Who Files, What They Claim, and Where the Field Is Still Open
16.0% concentration at the top. The five leading assignees hold 1,628 of the 10,147 records in scope — a real lead, but not a lock: the rest is a long tail of single- and few-filing entrants. Filings peaked at 442 records in 2017. By 2021 the field was publishing 294 records a year, and by 2024 — the most recent year that can be treated as complete — that had fallen to 153, a -48% move. 2025 and 2026 show far lower counts, but that reflects publication lag rather than a real collapse in filing.
- 1EI DU PONT DE NEMOURS & CO4.3%
- 2SEMICON ENERGY LAB CO LTD3.7%
- 3RESONAC CORP2.9%
- 4LG CHEM LTD2.6%
- 5HITACHI LTD2.5%
See the full polyimide film manufacturing analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about polyimide film patents
Who holds the most patents in polyimide film manufacturing?
One assignee leads the ranked field with 436 records, ahead of a fifth-place figure of 252 and a tenth-place figure of 165. Together the top five hold 1,628 records, which is 16.0% of the 10,147 records in scope — a real but not overwhelming concentration. The remainder of the field is a long tail of companies with far fewer filings each, so a full freedom-to-operate check needs to look well beyond the leaders.
Is polyimide film patent filing activity growing or declining?
Filing peaked in 2017 at 442 published records and has trended down since, with 294 records in 2021 falling to 153 in 2024 — a -48% move over that span. However, 2025 and 2026 counts are still low because publication lags filing by roughly 18 months, so those most recent years should not yet be read as continued decline. The clearest complete-year signal available is the 2021-2024 drop.
What technology areas dominate polyimide film patents?
Condensation polymer chemistry (IPC class C08G) and semiconductor device integration (H01L) are the two largest categories, appearing on 27.8% and 26.9% of all 10,147 records respectively. Printed circuit assemblies (H05K), polymer processing (C08J) and polymer compositions (C08L) each cover 17-19% of records, with laminates (B32B) and additives (C08K) further behind. Because a single record can carry multiple classes, these figures overlap rather than sum to 100%, reflecting a field where film chemistry and device application are usually claimed together.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Polyimide Film Manufacturing covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.