The assignee ranking for this dataset is concentrated at the top, with a small group of Japanese, Korean and Taiwanese materials and chemicals companies holding the bulk of the 285 tracked families. Sumitomo Chemical and Taiwan's ITRI stand out for their co-filing relationship, which is the strongest single link in the co-assignee data. Beyond that top group there is a long tail of assignees with only one or two filings each, so a full competitive picture requires checking the ranking table directly rather than assuming a single dominant player.

No — filing peaked in 2018 at 24 records and has since flattened, with the 2022 midpoint sitting at 21. That is a flat-to-declining pattern rather than sustained growth. The apparent drop toward 2026 is largely a publication-lag artifact, since patent applications typically publish around 18 months after filing, so the very latest years always look thinner than they eventually will.

That record claims a display device built on a polyimide-film support with a gas-barrier layer, specifically defined by an optical transmittance threshold, a maximum coefficient of thermal expansion, and a matched CTE difference between the polyimide film and the barrier layer. It is a narrowly parameterised claim rather than a blanket claim over polyimide barrier films generally. Anyone working with different transmittance, CTE, or CTE-matching values, or without the display-substrate context, has meaningful room to design around it, though a close reading of the granted claim scope against your specific film properties is still the safer path.

Relative to the heavily filed polymer-processing and composition classes (C08J, C08G, C08L), device-integration areas such as semiconductor packaging moisture barriers and optical-member barrier coatings show noticeably lower filing counts. Touch-sensor-grade barrier laminates and transparent conductive film integration on polyimide substrates also sit in thinner territory. These are not guarantees of novelty, but they are areas where the claim space is less crowded than the core materials chemistry, making them worth a closer freedom-to-operate look.

The United States receives the largest share of filings in this dataset, followed by Europe (EPO), Japan, China, the WIPO/PCT route, and South Korea. That spread reflects both a common practice of filing defensively in the US and EPO and genuine manufacturing and R&D activity concentrated in Japan, China and South Korea, where much of the display and flexible-electronics supply chain sits. A filing strategy that ignores the Asian offices would miss where a large share of the practical competition is actually recorded.