Liquid Crystal Polymer Film Patents: Leaders & Filing Trends 2026
- Filing activity peaked in 2020 at 53 families then dropped sharply through 2022, a pattern that does not match a technology still scaling up.
- Claim density concentrates in circuit substrate use H05K (printed circuits) sits at 98 of 192 records alongside C08J polymer processing at 131, showing the film's main commercial pull is high-frequency circuitry, not general coatings.
- Only five co-assignee pairs exist across 192 families meaning most filers are working alone rather than in joint-development arrangements — collaboration is the exception here, not the norm.
What this landscape covers
Liquid crystal polymer (LCP) film and coating patents span resin composition, film-forming processes, and the lamination steps that turn LCP resin into a usable flexible substrate. This dataset pulls 192 patent families published between 2015 and mid-2026 that combine liquid crystal polymer terminology with film- or substrate-specific claim language, filtered to the IPC classes covering polymer processing, printed-circuit substrates, and polyester condensation chemistry. The search intentionally narrows on film and coating claims rather than bulk LCP resin or injection-moulded parts, so the picture here is of a substrate technology, not the broader LCP materials market.
The filing curve is not a growth story. Activity rose to a 2020 peak of 53 families and has fallen in most years since, with the 2022 midpoint down to 6. Because publication typically lags filing by around 18 months, the last one or two years in any such trend will always look thinner than they eventually turn out to be — but the multi-year decline from the 2020 peak predates that lag effect and reflects a real pull-back in new filing.
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Filing trend and technology composition
Two views of the same 192-family dataset: when filings happened, and which IPC subclasses they touch. Both point to a technology that built up claim density fast around one peak year and has since concentrated on circuit-substrate applications rather than expanding into new film categories.
A 2020 peak followed by contraction
Filings rose from 4 in 2017 to a peak of 53 in 2020, then fell back to 6 by 2022. That shape is more consistent with a wave of filing tied to a specific commercial window — likely 5G-driven demand for high-frequency substrates — than with a steadily maturing field. The most recent year, 2026, is partial and should not be read as a trough.
Circuit substrates dominate the IPC mix
C08J (polymer processing, 131 records) and B32B (layered products, 103) lead, but H05K (printed circuits and assemblies, 98) is close behind — an unusually high share for a materials-classified search. That confirms most LCP film patenting here is aimed squarely at flexible circuit substrates rather than generic coatings, with C08L polymer compositions (75) and B29C plastics shaping (57) supporting that same end use.
Shares are the percentage of the 192 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Liquid Crystal Polymer Coating and Film with Eureka
This page is one run against one query. Ask Eureka your own question about liquid crystal polymer coating and film and every answer comes back with the patent numbers behind it.
Try EurekaFoundational and representative filings
Method for manufacturing LCP film for circuit substrate and t-die melt-extruded LCP film for circuit substrate (DENKA COMPANY LIMITED, 2022)
The method combines 100 parts by mass of liquid crystal polyester with 1 to 20 parts by mass of a polyarylate, then forms the film through a T-die melt-extrusion step, aiming to lower the coefficient of linear thermal expansion and improve dimensional stability without sacrificing the mechanical, electrical and heat-resistance properties liquid crystal polyester already provides.Filed by DENKA, published 2022-12-29 — illustrates the composition-plus-process claim style common among recent circuit-substrate filings.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5719354A | Monolithic LCP polymer microelectronic wiring modules | 159 |
| 2 | US5863622A | Polarizer laminates comprising coextruded liquid crystal polymer moieties and integral thermoplastic cover la… | 138 |
| 3 | US4966807A | Multiaxially oriented thermotropic polymer films and method of preparation | 64 |
| 4 | WO2000007975A1 | Liquid crystalline compounds | 52 |
| 5 | US5248530A | Heat sealable coextruded LCP film | 40 |
| 6 | US20030010376A1 | Outer covering for solar battery | 32 |
| 7 | US20180332710A1 | Composite LCP high-frequency high-speed double-sided copper foil substrate and preparation method thereof | 26 |
| 8 | US20160212845A1 | Thermoplastic liquid crystal polymer film, circuit board, and methods respectively for manufacturing said fil… | 24 |
| 9 | CN109467722A | 一种用于FPC行业的LCP薄膜及其制备方法 | 22 |
| 10 | US20030118836A1 | Fluoropolymer laminates and a process for manufacture thereof | 20 |
Citation counts favour older records simply because they have had longer to accumulate citations inside the searched corpus; treat them as a signal of influence on later filings, not of current commercial relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for filing strategy
Three patterns stand out once the filing trend and IPC mix are read together: a filing wave that has crested, a citation base anchored in decades-old foundational patents, and a field where collaboration is rare.
The filing wave has already crested
A run-up to 53 families in 2020 followed by a fall to 6 by 2022 suggests a concentrated filing window rather than sustained expansion. New entrants filing broad composition claims now are working later than the field's main land-grab period.
Foundational claims date to the 1990s
The most-cited records in this set, including US5719354A and US5863622A, were filed decades before the 2020 filing peak. Later filers are building on wiring-module and polarizer-laminate concepts that are now long out of their original priority window.
Most filers work alone
Only five co-assignee pairings appear across the full dataset, the strongest being a five-family link between two established polymer producers. That scarcity of joint filings points to proprietary, in-house development as the norm rather than joint ventures or shared R&D.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to liquid crystal polymer coating and film, with the prior art for and against each one.
Who is filing, and where momentum has stalled
Recent-year momentum data shows a striking pattern: none of the named assignees tracked for year-over-year filing activity recorded any filings in the latest year, and one shows a full -100% year-on-year drop. That is consistent with the broader post-2020 pull-back in the filing trend rather than an isolated event at any one company.
US filings lead, China close behind
The United States receives the largest share of filings at 59, with China at 38 and EPO at 30. Japan (25), WIPO/PCT (16) and Taiwan (9) round out the picture, showing filing strategy split fairly evenly across the major electronics-manufacturing jurisdictions rather than concentrated in one.
Named assignees show no recent-year filings
Every assignee tracked for recent-year momentum, including established polymer and materials producers, recorded zero filings in the latest year. This lines up with the filing trend's post-2020 decline and suggests the current lull is field-wide rather than company-specific.
Joint filing is limited to a handful of pairs
The strongest co-assignee link in the dataset spans five shared families between two polymer producers; the next strongest pairs drop to four and one. Co-development is not the primary route to market here — most assignees build their portfolios independently.
| Assignee | Recent year | YoY |
|---|---|---|
| Changchun Synthetic Resin Factory Co., Ltd. | 0 | — |
| Denka Company Limited | 0 | — |
| Celanese Corporation | 0 | — |
| Kuraray Co., Ltd. | 0 | -100% |
| Rolic Ltd. | 0 | — |
| DuPont-Mitsui Fluorochemicals Co., Ltd. | 0 | — |
| Ningxia Qingyan Polymer New Material Co., Ltd. | 0 | — |
| Murata Manufacturing Co., Ltd. | 0 | — |
Where to take this analysis
The filing trend and IPC composition point to specific next steps depending on whether the goal is freedom-to-operate, portfolio building, or scouting acquisition targets.
Check freedom-to-operate against the cited foundational patents
Before filing new composition or lamination claims, review how close proposed claims sit to the decades-old foundational patents still driving citation counts in this space.
Explore prior art in EurekaMap the under-claimed branches against your own R&D roadmap
The gaps in condensation-route resin chemistry and multilayer antenna lamination suggest where a first-mover claim could still stick, if it matches active development work.
Run a white space search in EurekaWatch for renewed filing once the post-2020 lull clears
With every tracked assignee at zero filings in the latest year, the next filing wave — if it comes — will be worth catching early, since publication lag means it may already be underway.
Set up monitoring in EurekaCommon questions on LCP film patents
The dataset shows filings climbing to 53 families in 2020 from just 4 in 2017, which lines up with the ramp-up in 5G infrastructure and flexible high-frequency circuit substrates around that period. LCP film's low dielectric loss and dimensional stability made it attractive for antenna and circuit substrate applications during that build-out. The subsequent drop to 6 families by 2022 suggests that filing wave has largely run its course, at least for the composition and process claims captured in this search. Anyone filing now should assume they are entering after the main land-grab period rather than during it.
By citation count, the most influential records in this dataset are older foundational patents rather than recent filings: US5719354A on monolithic LCP microelectronic wiring modules leads with 159 citations, followed by US5863622A on polarizer laminates with LCP moieties at 138. These establish core concepts that many later circuit-substrate and lamination patents build on. Because citation counts favour older records simply through accumulated time in the corpus, high citation counts should be read as a marker of historical influence, not of current commercial dominance.
This DENKA filing claims a specific manufacturing method: a T-die melt-extrusion process using an LCP resin composition of 100 parts liquid crystal polyester combined with 1 to 20 parts polyarylate, aimed at lowering the coefficient of linear thermal expansion while preserving mechanical, electrical and heat-resistance properties. Anyone developing a similar low-CTE LCP film through T-die extrusion with a polyarylate additive in that same ratio range should review this claim closely for overlap. It does not block LCP film production generally, only this particular composition-and-process combination for circuit substrate applications.
The IPC composition suggests some under-claimed areas relative to the dense circuit-substrate cluster: condensation-route resin chemistry under C08G sits at only 49 records against 131 for C08J polymer processing, and multilayer LCP-metal lamination for antenna structures appears thinner than the core film-forming claims. With only five co-assignee pairs across 192 families, there is also room for joint development approaches that few current filers are using. That said, white space should be verified against a full freedom-to-operate search before committing R&D resources, since IPC-level gaps do not guarantee claim-level openness.
The United States leads with 59 filings in this dataset, followed by China at 38 and the European Patent Office at 30. Japan follows at 25, WIPO's PCT route at 16, and Taiwan at 9. This distribution reflects the concentration of electronics and flexible-substrate manufacturing capacity across these jurisdictions, and companies developing LCP film technology for circuit applications typically need to consider filing strategy across at least the US, China and EPO given how closely those three offices track each other in filing volume.
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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.