Polyimide Composite Patents: Who Leads, Filing Trends 2026
Polyimide Composite Reinforcement Patents: Where Filing Has Plateaued
Filings peaked in 2018 and have since flattened. the curve fell from 30 in 2018 to a 2022 midpoint of 18, with no sign of a new growth phase. Filings rose to a peak of 30 in 2018, sat near a midpoint of 18 by 2022, and have not returned to peak levels since — a flat-to-declining trend rather than a growth curve. The final year or two is necessarily undercounted, since publication typically lags filing by around 18 months.
- 1MITSUI CHEMICALS INC5.5%
- 2AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH4.3%
- 3EI DU PONT DE NEMOURS & CO2.5%
- 4HEILONGJIANG XINDA ENTERPRISE GRP2.1%
- 5LUOYANG BEARING RES INST CO LTD1.8%
See the full polyimide composite reinforcement 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 composite reinforcement patents
Who holds the most influential patents in polyimide composite reinforcement?
The most-cited records in this dataset are US20120065283A1 on reinforced thermoplastic articles and the related pair US5549394A and US5664890A on polyimide graphite-fiber composite bearing arrangements. These are influence signals within the searched corpus, not current market-share indicators, since older patents accumulate citations simply by being available longer. A newer, less-cited filing can still be commercially important if it targets a route the older patents do not cover.
Is polyimide composite reinforcement patent filing still growing?
No — filings peaked at 30 in 2018 and had fallen to a midpoint of 18 by 2022, with the trend flat to declining through the most recent tracked years. The final year or two in any such dataset is understated because publication lags filing by roughly 18 months, so recent activity is not fully visible yet. Even accounting for that lag, the shape of the curve points to a mature filing base rather than an accelerating one.
Which patent classes cover the core polyimide composite chemistry?
C08K (use of additives in polymers) and C08L (polymer compositions) carry the largest share of records, both close to three-quarters of the dataset, followed by C08J for processing and solution work. B29C covers shaping of the finished composite, while B32B, B29B and C09K cover laminate structure, plastics preparation and specialty materials respectively at much lower density. That spread shows the field is defined more by formulation and additive chemistry than by any single fabrication method.
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 Composite Reinforcement 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.