Epoxy Resin Coating Patents: Leaders & Filing Trends 2026
- Filing has flattened, not grown. Activity peaked in 2020 at 392 filings and sat at 328 by the 2022 midpoint, well off any growth trajectory.
- Coatings claims dominate the IPC mix. C09D appears in 10,094 of 11,109 records, meaning nearly every filing touches core coating-composition claim language.
- China leads filing office by a wide margin. 3,172 records route through China, more than double the next office, Japan at 1,869.
Filing growth compares 2021 (326 records) with 2024 (335) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 11,109 records in scope (CR5), not by the ranked leaders only.
What the epoxy resin coating and film patent record shows
Epoxy resin coating and film patents cluster tightly around one classification: C09D, the coatings, paints and inks subclass, which touches roughly nine in ten records in this dataset. That concentration is not surprising for a chemistry this mature, but it means the competitive question is less about whether a filing touches coatings claims and more about which specific formulation, cure chemistry or layered-film structure it stakes out inside that crowded space.
The secondary IPC classes tell the more useful story. Condensation-polymer chemistry (C08G) and coating processes (B05D) each show up in over a fifth of records, while additive use (C08K), layered products (B32B) and addition-polymer chemistry (C08F) trail well behind. That gap between the well-claimed core and the thinner adjacent classes is where a freedom-to-operate review should start.
Filing trend and technology composition
Two views of the same 11,109-family dataset: how filing volume has moved year over year, and how those filings distribute across the eight IPC subclasses that define this field.
A flat-to-declining filing curve since the 2020 peak
Filings rose from 326 in 2017 to a peak of 392 in 2020, then eased back to 328 by the 2022 midpoint. The most recent year shown (76) is a partial count and understates true 2026 activity, since publication typically lags filing by around 18 months. Even allowing for that lag, the multi-year trajectory reads as mature and cyclical rather than expansionary.
Coatings claims dominate; adjacent classes are thinner
C09D covers 10,094 of 11,109 records, with C08G (4,490) and B05D (2,253) as the next-largest classes. C08L, C08K, B32B, C08J and C08F each appear in under a fifth of records, marking the areas where claim density drops off sharply relative to the coatings core.
Shares are the percentage of the 11,109 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Epoxy Resin Coating and Film with Eureka
This page is one run against one query. Ask Eureka your own question about epoxy resin coating and film and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
Epoxy resin powder coating composition
This filing describes an epoxy resin powder coating built from a hardener and a mixed filler system: a needle-like glass powder with a minimum aspect ratio combined with a fine granular inorganic filler, both dosed relative to the epoxy resin base. The claimed combination is presented as delivering impact resistance at both room and low temperature along with improved flexibility on a coated steel substrate.Filed by Nitto Electric Industrial Co., Ltd.; granted 1987-01-27.
View full record| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4069055A | Photocurable epoxy compositions containing group Va onium salts | 1,296 |
| 2 | US6268055B1 | Photochromic epoxy resin coating composition and articles having such a coating | 417 |
| 3 | US3741253A | Laminates of ethylene vinyl acetate polymers and polymers of vinylidene chloride | 392 |
| 4 | EP0249201A2 | High solids sag resistant cycloaliphatic epoxy coatings containing low molecular weight high Tg organic polym… | 371 |
| 5 | US7125461B2 | Activatable material for sealing, baffling or reinforcing and method of forming same | 264 |
| 6 | US4247439A | Water-borne coating composition made from epoxy resin, polymeric acid and tertiary amine | 249 |
| 7 | US20170036403A1 | 3D Print Bed Having Permanent Coating | 237 |
| 8 | CN1876740A | 无溶剂环氧膨胀型防火涂料及其制备方法 | 234 |
| 9 | US7037958B1 | Epoxy coating | 221 |
| 10 | US6184311B1 | Powder coating composition of semi-crystalline polyester and curing agent | 202 |
Citation counts reflect influence within this searched corpus and skew toward older filings; they are not a measure of current commercial importance.
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 raw counts are put side by side: where citation weight sits, how filing volume has trended, and where jurisdictional filing is concentrated.
Influence sits with decades-old foundational filings
The most-cited record in this corpus, a photocurable epoxy composition filing, carries far more citations than anything filed in the last decade. That is expected of citation counts in a mature field: older filings have simply had more years to accumulate references, so high citation counts should be read as historical influence, not as a signal of which claims matter most today.
Volume has eased off its 2020 peak
Filings climbed from 326 in 2017 to a peak of 392 in 2020, then settled near 328 by the 2022 midpoint. That pattern points to a field occupied by incremental formulation and process claims rather than one attracting a new wave of entrants.
China is the largest single filing office by a wide margin
China accounts for more filings than Japan and the United States combined among the top offices, with Japan at 1,869 and the US at 1,489. Europe, Canada and the PCT route trail further behind, which shapes where enforcement and freedom-to-operate risk is most concentrated.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to epoxy resin coating and film, with the prior art for and against each one.
Assignee landscape and collaboration patterns
Filing activity in this dataset sits with a recognisable set of coatings and materials companies, several of which co-file with adjacent suppliers rather than filing solely under one name.
Co-filing is concentrated in one dominant pairing
Of the ten identified co-assignee pairs, one pairing between a major materials group and its acrylics affiliate accounts for the largest share of shared families by a wide margin, with the next strongest pairs sitting in the single digits. This suggests most collaboration in the space is structural, tied to corporate affiliate relationships, rather than broad cross-industry joint filing.
Momentum has cooled even among historically active filers
Several of the assignees with the deepest filing history in this space show zero filings in the latest tracked year, and one shows a full year-over-year drop to zero. Read alongside the flattening overall trend, this points to established players consolidating existing claim positions rather than pushing new filings.
A broad base with concentration at the top
The assignee ranking spans the full 11,109-family dataset, with filing activity showing the concentrated-top, long-tail pattern typical of a mature chemistry: a handful of coatings majors hold recognisable positions, while a large number of entrants appear with only one or a few filings.
| Assignee | Recent year | YoY |
|---|---|---|
| Akzo Nobel Coatings International B.V. | 1 | 0% |
| PPG Industries Ohio, Inc. | 0 | -100% |
| Dow Chemical Company | 0 | — |
| Dow Global Technologies LLC | 0 | — |
| Kansai Paint Co., Ltd. | 0 | — |
| Shell International Research Maatschappij B.V. | 0 | — |
| E.I. du Pont de Nemours and Company | 0 | — |
| Nippon Paint Co., Ltd. | 0 | — |
Where to take this analysis
The dataset points to a field with occupied core claim space and thinner adjacent branches. The next steps depend on whether the goal is defensive clearance or identifying open filing room.
Run a freedom-to-operate check on the coatings core
With C09D touching roughly nine in ten records, any new formulation should be checked against the dense claim language in that subclass before development spend goes further.
Explore claim scope in Eureka →Map the thinner IPC branches for open filing room
B32B, C08F and C08J each show materially lower filing density than the coatings core, which is where a first claim is more likely to clear without heavy prior-art collision.
Search white space in Eureka →Common questions about epoxy resin coating and film patents
Filing activity in this space sits with a recognisable group of coatings and materials companies rather than a single dominant holder. The ranking follows a concentrated-top, long-tail pattern: a small number of assignees hold larger, recognisable positions, while a much larger group of filers appear with only one or a handful of families. Several of the historically largest filers show little to no activity in the most recent tracked year, which suggests the current leaderboard reflects accumulated filing history more than recent momentum.
Based on this dataset, filing activity has flattened since a 2020 peak of 392 filings, easing back to 328 by the 2022 midpoint. The most recent year is a partial count, since patent publication typically lags actual filing by around 18 months, so the true 2026 figure will be higher than currently shown. Even accounting for that lag, the multi-year trend does not show sustained growth; it reads as a mature field with cyclical filing volume.
US4639476A claims an epoxy resin powder coating composition built around a specific filler system: a needle-like glass powder above a minimum length and aspect ratio, combined with a fine granular inorganic filler, both dosed in defined proportions relative to the epoxy base. Anyone formulating a powder coating that relies on a comparable dual-filler approach for impact resistance and low-temperature flexibility should review this claim scope closely. Designing around it generally means moving to a different filler morphology, a different dosing ratio, or a different mechanism for achieving impact and flexibility performance.
C09D, covering coatings, paints and inks, is by far the dominant classification, appearing in the large majority of records in this field. C08G (condensation polymers) and B05D (coating processes) are the next most common, each appearing in over a fifth of filings. Classes such as B32B (layered products), C08F (addition polymers) and C08J (polymer processing) appear far less often, making them useful markers of where claim density is lighter.
The clearest gaps sit in the IPC classes with materially lower filing counts than the C09D coatings core, including layered laminate structures (B32B), addition-polymer hybrid chemistry (C08F) and polymer processing routes (C08J). These are not unclaimed spaces, but they carry noticeably less filing density than the core coating-composition claims, which typically means more room for a first claim to clear prior art. A practical next step is checking recent filings in those specific subclasses rather than assuming the whole field is closed.
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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.