Epoxy Resin Quality Control Patents: Leaders, Trends & White Space 2026
- Filing has plateaued, not grown. the peak year so far is 2021 at 10 families, and the 2022 midpoint matches it — this is a flat field, not an expanding one.
- Claim density sits overwhelmingly in one IPC bucket. C08G condensation-polymer chemistry covers 524 of 536 records, while adjacent process and inspection classes (H05K, C08F) are comparatively thin.
- No tracked assignee filed in the latest year. every major name in the momentum data — including Dow Chemical Company and BASF Coatings GmbH — shows zero recent-year filings, consistent with the 18-month publication lag rather than exit.
Filing growth compares 2021 (10 records) with 2024 (5) — 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 536 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape tracks 536 patent families published between 2015 and mid-2026 that combine epoxy resin chemistry with quality-control practice — cure monitoring, viscosity control and defect detection — under IPC classes spanning condensation polymer chemistry (C08G59), thermal analysis (G01N25) and moulding processes (B29C37). The scope is deliberately narrow: it is not all epoxy resin filings, but the subset where the claim language ties resin formulation directly to a measurable process or quality check.
Filing offices cluster in the United States, Japan and Europe, with WIPO PCT and UK filings forming a smaller secondary tier — a pattern typical of an established industrial chemistry rather than an emerging one.
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Filing trend and technology composition
Two views of the same 536-family dataset: how filing volume has moved year over year, and how those filings distribute across IPC subclasses.
Filing trend, 2017–2026
Annual filings rose from 8 in 2017 toward a peak of 10 in 2021, held at 10 through the 2022 midpoint, and have not exceeded that level since. The 2026 figure of 0 reflects the partial year and publication lag rather than a genuine drop-off; expect upward revision as later filings publish.
IPC composition
C08G (condensation polymers) dominates at 524 of 536 records, essentially co-extensive with the search scope itself. C08L (polymer compositions, 292), C09D (coatings, 127) and C08J (polymer processing, 126) form a clear second tier, while C09J (adhesives, 84), C08F (addition polymers, 72) and H05K (printed circuits, 47) mark the outer, thinner edges of the field.
Shares are the percentage of the 536 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Epoxy Resin Quality Control with Eureka
This page is one run against one query. Ask Eureka your own question about epoxy resin quality control and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited prior art and a representative recent filing
US20230416521A1 — Thermosetting epoxy resin composition, molded article, and fiber-reinforced composite production method
Filed by TORAY INDUSTRIES, INC., this application claims a thermosetting epoxy resin composition combining an epoxy resin, an isocyanate curing agent held to a defined stoichiometric ratio, and additional components, aimed at cured products that hold both toughness and high stiffness — a combination the abstract frames as difficult to achieve together.Abstract trimmed for length; stoichiometric ratio and component definitions are claim-critical.
View full record| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4069055A | Photocurable epoxy compositions containing group Va onium salts | 1,296 |
| 2 | US4058401A | Photocurable compositions containing group via aromatic onium salts | 563 |
| 3 | EP0249201A2 | High solids sag resistant cycloaliphatic epoxy coatings containing low molecular weight high Tg organic polym… | 371 |
| 4 | US4216288A | Heat curable cationically polymerizable compositions and method of curing same with onium salts and reducing … | 317 |
| 5 | US4778851A | Rubber-modified epoxy compounds | 311 |
| 6 | US4212781A | Modified epoxy resins, processes for making and using same and substrates coated therewith | 291 |
| 7 | US4138255A | Photo-curing method for epoxy resin using group VIa onium salt | 286 |
| 8 | US4442197A | Photocurable compositions | 282 |
| 9 | US4026705A | Photocurable compositions and methods | 219 |
| 10 | WO2003066704A1 | Oligomeric chain extenders for processing, post−processing and recycling of condensation polymers, synthesis,… | 189 |
Citation counts favour older filings by construction — a searched corpus accumulates citations over time — so read this table as a map of foundational chemistry, not of current competitive priority.
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 read-throughs from the trend, composition and citation data above.
A mature, not a growing, field
The absence of growth past the 2021 peak suggests the core chemistry-to-QC claim space is largely staked out. New entrants are more likely to find room in adjacent process integration than in the core resin-plus-monitoring claim itself.
One IPC bucket carries nearly the whole field
With C08G covering 98% of records, differentiation inside this landscape happens at the level of specific curing agents, ratios and additive systems, not at the level of broad resin-monitoring concepts — those are already occupied.
Foundational onium-salt cure chemistry still anchors the field
The most-cited records date to photocurable and cationic cure chemistry from the late 1970s and 1980s. Their persistence as citation anchors signals that cure-triggering chemistry, not measurement instrumentation, is the doctrinal center of this space.
Collaboration is narrow and vendor-specific
Co-assignee activity concentrates around a small number of individual-inventor pairings inside a few large filers, rather than broad cross-company joint filing — consistent with in-house formulation work rather than open co-development.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to epoxy resin quality control, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| E. I. du Pont de Nemours and Company (DuPont) | RAJENDRAN GOVINDASAMY PARAMASIVAM | 7 |
| BASF Coatings GmbH | VILLALOBOS MARCO A | 3 |
| BASF Coatings GmbH | TAZZIA CHARLES L | 3 |
| BASF Coatings GmbH | HARRIS PAUL J | 3 |
| Dow Global Technologies LLC | HEFNER ROBERT E JR | 3 |
| Dow Global Technologies LLC | LUDOVIC VALETTE | 2 |
| Dow Global Technologies LLC | EARLS JIM D | 2 |
| Dow Global Technologies LLC | CARSON TERRI J | 2 |
The strongest co-assignee pairing links E. I. du Pont de Nemours and Company (DuPont) with an individual inventor across seven records; the next tier links BASF Coatings GmbH with two individual inventors at three records each.
Who holds the claim space
Filing activity concentrates among a handful of established materials and chemicals companies, with a long tail of single- or few-filing entities behind them.
Every major assignee shows zero recent-year filings
Toray Industries, Inc., Dow Chemical Company, E. I. du Pont de Nemours and Company (DuPont), 3M Company, BASF Coatings GmbH and General Electric Company all register zero filings in the most recent tracked year — a pattern the 18-month publication lag explains better than a genuine pullback.
Three-region filing strategy, no single dominant office
The United States, Japan and Europe each account for a comparable share of filings, with WIPO PCT, the UK and Canada forming a smaller secondary tier — indicative of deliberate multi-region protection rather than a single home-market focus.
A recognizable core group plus a long tail
A small set of chemicals and materials majors — including Dow Global Technologies LLC, Amoco Corporation, Union Carbide Corporation and Borden Chemical, Inc. — recur across the dataset, but the bulk of the 536 families trace to single- or few-filing entities, typical of a chemistry where formulation know-how is dispersed across many smaller players.
| Assignee | Recent year | YoY |
|---|---|---|
| Toray Industries, Inc. | 0 | — |
| General Electric Company | 0 | — |
| Dow Chemical Company | 0 | — |
| E. I. du Pont de Nemours and Company (DuPont) | 0 | — |
| 3M Company | 0 | — |
| BASF Coatings GmbH | 0 | — |
| Dow Global Technologies LLC | 0 | — |
| Amoco Corporation | 0 | — |
Where to take this landscape
The dataset points to where claim space is dense and where it is not. The next step is usually one of these.
Map a specific curing-agent system against prior art
Run the stoichiometric ratio and curing-agent combination from a target formulation against the most-cited onium-salt and cationic cure patents to check for freedom to operate.
Explore in Patsnap Eureka →Track the recent-year publication gap
Re-pull the filing trend in six months once 2025–2026 filings clear the publication lag, to see whether the 2021 peak has actually been exceeded.
Explore in Patsnap Eureka →Scope a white-space filing in defect detection
Use the under-claimed sub-areas identified here as a starting point for a first claim in non-contact or in-line inspection, where C08G coverage is thinner.
Explore in Patsnap Eureka →Common questions about epoxy resin quality control patents
This landscape tracks 536 patent families published between 2015 and mid-2026 that combine epoxy resin formulation claims with quality-control practices such as cure monitoring, viscosity control and defect detection. That figure reflects a specific search scope tied to IPC classes C08G59, G01N25 and B29C37, so a broader search on epoxy resin chemistry generally would return a much larger number. Families, rather than raw document counts, are used here because they neutralize duplicate filings across jurisdictions.
The tracked leaders are established materials and chemicals companies, including Toray Industries, Inc. (Toray), Dow Chemical Company (Dow Chemical), E. I. du Pont de Nemours and Company (DuPont) (DuPont), 3M Company (3M), BASF Coatings GmbH (BASF Coatings) and General Electric Company (General Electric). None of these shows filings in the most recent tracked year, which is consistent with normal publication lag rather than a change in strategy. Behind this group sits a long tail of single- or few-filing entities, typical of a chemistry where formulation know-how is widely dispersed.
No — filing activity peaked so far at 10 families in 2021 and the 2022 midpoint matched that level, with no year since exceeding it. This points to a plateaued field rather than an expanding one; the core resin-plus-monitoring claim space appears largely staked out. Newer filings are more likely to succeed by narrowing into specific curing agents, additive systems or process integrations than by claiming broad cure-monitoring concepts.
US20230416521A1, filed by TORAY INDUSTRIES, INC., claims a thermosetting epoxy resin composition built from an epoxy resin, an isocyanate curing agent held within a defined stoichiometric ratio range, and additional specified components. The stated aim is a cured product that holds both toughness and high stiffness simultaneously — properties the filing frames as historically difficult to combine. Anyone formulating a competing composite matrix resin should check whether their curing-agent ratio falls inside the claimed range before assuming freedom to operate.
The thinnest coverage relative to the dominant C08G cure chemistry sits in adjacent process and inspection areas — in-line viscosity sensing during resin transfer, real-time cure-state feedback for fiber-reinforced composites, and non-contact or imaging-based defect detection, including in printed-circuit-board contexts (H05K accounts for only 47 of 536 records). These branches are under-claimed relative to the core resin chemistry, which suggests more room for a first-mover claim built around a specific sensing or inspection method rather than the resin formulation itself.
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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.