Epoxy Resin Testing and Inspection Patent Landscape 2026
- Filing has cooled since its 2018 peak of 20. the midpoint year 2022 sat at 11, and the trend since reads flat to declining rather than growing — this is a mature claim space, not an emerging one.
- C08L polymer-composition claims dominate at 251 of 273 records. while G01N testing-method claims proper account for only 20 — most of the corpus patents the resin formulation being tested, not the test itself.
- The United States (94 filings) and India (47) lead receiving offices. with Europe, WIPO, Japan and Canada trailing well behind, showing filing strategy concentrated in two jurisdictions rather than spread globally.
Filing growth compares 2021 (18 records) with 2024 (10) — 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 273 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks 273 patent families at the intersection of epoxy resin or epoxy formulation claims and cure monitoring, DMA/DSC testing, mechanical testing or defect inspection language, filtered to IPC classes G01N25 (thermal analysis), G01N3 (mechanical testing) and C08L63 (epoxy polymer compositions). It is a formulation-heavy corpus: most records claim the resin system itself, with testing or inspection method described as a supporting step rather than the invention’s core.
Publication lags filing by roughly 18 months, so the 2025-2026 counts in the trend chart understate actual filing activity for those years and should not be read as a real drop-off yet.
Filing trend and technology composition
Two views of the same 273 families: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
A peak in 2018, then a plateau
Filings rose from 2 in 2017 to a peak of 20 in 2018, then settled to a midpoint of 11 by 2022 and 9 by 2026 (partial year). Read as a whole, the curve is flat-to-declining rather than growing, consistent with a technology area where the core formulation claims were staked out early and later filings are incremental.
Formulation claims outweigh test-method claims
C08L (polymer compositions, 251 records) and C08G (condensation polymers, 160) dominate the classification mix, with C08K additives (95), C08J processing (58) and C09J adhesives (56) also well represented. G01N — material analysis and testing, the classification closest to a pure test-method claim — appears in only 20 records, meaning most cure-monitoring or defect-inspection language attaches to a resin composition claim rather than standing alone.
Shares are the percentage of the 273 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Epoxy Resin Testing and Inspection with Eureka
This page is one run against one query. Ask Eureka your own question about epoxy resin testing and inspection and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
Adhesive of epoxy resin, diene copolymer-modified epoxy resin, phenolic-terminated elastomeric toughener and polyester segment polymer
The present invention relates to an epoxy adhesive composition comprising a first epoxy resin, a second epoxy resin modified with a copolymer based on a 1,3-diene and a polar, ethylenically unsaturated comonomer, a toughener, and a polymer comprising a polyester segment that is at least partially crystalline at room temperature with a softening temperature between 40°C and 125°C. The invention further relates to use of such a composition for bonding vehicle parts without prehardening.Abstract text taken directly from the patent filing.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5648407A | Curable resin sols and fiber-reinforced composites derived therefrom | 403 |
| 2 | US20060166003A1 | Fabrication of carbon nanotube reinforced epoxy polymer composites using functionalized carbon nanotubes | 240 |
| 3 | US6887574B2 | Curable flame retardant epoxy compositions | 174 |
| 4 | US20050119371A1 | Bio-based epoxy, their nanocomposites and methods for making those | 88 |
| 5 | US20100222461A1 | Epoxy compositions with improved mechanical performance | 75 |
| 6 | US20120328811A1 | Epoxy Resin Compositions | 70 |
| 7 | US7601421B2 | Fabrication of carbon nanotube reinforced epoxy polymer composites using functionalized carbon nanotubes | 68 |
| 8 | US20040247881A1 | Curable flame retardant epoxy resin compositions | 66 |
| 9 | US5709469A | Process for testing integrity of bonds between epoxy patches and aircraft structural materials | 64 |
| 10 | WO2007004184A1 | Solid thermally expansible material | 59 |
Citation counts accumulate over time and favour older filings; treat them as a measure of influence on later filers, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-outs from the filing trend, IPC mix and citation pattern that matter for anyone deciding where to file or what to search before filing.
The peak has passed
Filing activity crested in 2018 at 20 families and has not returned to that level since; the 2022 midpoint of 11 confirms a downward drift rather than a temporary dip. New entrants should expect dense prior art around core epoxy-cure and mechanical-test claims from the 2017-2019 cohort.
Testing is a clause, not the claim
With C08L (polymer compositions) covering 251 records against just 20 in G01N (material analysis/testing), the overwhelming pattern is a formulation claim that recites a cure-monitoring or mechanical-test step to support enablement, not a standalone inspection-method patent.
Filing strategy is bimodal
United States (94) and India (47) together account for the large majority of receiving-office activity, with EPO (37), WIPO (29), Japan (15) and Canada (11) well behind. A filing strategy built only around US/EPO/JP coverage would miss where a large share of this corpus actually sits.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to epoxy resin testing and inspection, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Dow Global Technologies LLC | University of Minnesota | 7 |
| Dow Global Technologies LLC | Texas A&M University | 3 |
| Dow Global Technologies LLC | Regents of the University of Minnesota | 2 |
| Dow Global Technologies LLC | UNIV OF MINNESOTA (US) | 2 |
| Dow Global Technologies LLC | ZHANG YI | 1 |
| Dow Global Technologies LLC | VYAKARANAM KAMESWARA | 1 |
| Dow Global Technologies LLC | VERGHESE NIKHIL E | 1 |
| Dow Global Technologies LLC | STROTHER JACOB | 1 |
Only 10 co-assignee pairs appear across the corpus, and the strongest link — Dow Global Technologies LLC with University of Minnesota — reaches just 7 shared filings. Most assignees in this space are filing solo rather than through joint programmes.
Who holds the claim space, and where it's open
Recent-year momentum across the named assignees reads flat: each of the leading holders shows 0 filings in the latest year, which — given the 18-month publication lag — likely reflects filings still working through the pipeline rather than an actual stop in activity.
Dow Global Technologies LLC
The strongest co-assignee link in the dataset runs through this pairing, suggesting an academic partnership feeding formulation or characterization claims rather than a purely internal R&D pipeline.
PPG Industries Ohio, Inc.
Present among the leading assignees by historical volume but showing no recent-year momentum in this dataset, consistent with the corpus-wide plateau rather than a company-specific pullback.
Zephyros, Inc.
A named holder in the adhesives-adjacent portion of this space (C09J appears in 56 records corpus-wide); like its peers it shows no filings in the most recent tracked year.
3M Innovative Properties Company
Appears among the named leading assignees; the absence of latest-year activity across every top holder in this list points to a corpus-wide slowdown rather than any single company exiting the space.
| Assignee | Recent year | YoY |
|---|---|---|
| Dow Global Technologies LLC | 0 | — |
| PPG Industries Ohio, Inc. | 0 | — |
| Zephyros, Inc. | 0 | — |
| 3M Innovative Properties Company | 0 | — |
| Cytec Industries Inc. | 0 | — |
| Huntsman Advanced Materials Licensing (Switzerland) GmbH | 0 | — |
| DDP Specialty Electronic Materials US, LLC | 0 | -100% |
| Air Products and Chemicals, Inc. | 0 | — |
Where to take this analysis
The filing trend and IPC mix point to a mature formulation space with a thin layer of true test-method claims sitting on top of it. Two directions follow from that.
Map the G01N sliver against the C08L base
Only 20 of 273 records sit in G01N proper; cross-referencing those against the dominant C08L formulation claims shows exactly which resin systems still lack a dedicated test or inspection claim.
Explore the IPC breakdown in EurekaWatch for the 18-month lag to close
Recent-year counts (2025-2026) are undercounted by definition; re-running this trend in 6-12 months will reveal whether the plateau is real or an artefact of pending publications.
Set up filing alerts in EurekaCommon questions about this landscape
This dataset identifies 273 patent families filed between 2017 and 2026 that combine epoxy resin or epoxy formulation language with cure monitoring, DMA/DSC testing, mechanical testing or defect inspection terms, classified under G01N25, G01N3 or C08L63. Families are the fairer unit to cite than raw document counts because they neutralise duplicate filings across jurisdictions and continuation applications. The true figure for the most recent one to two years will be higher once pending applications publish, given the roughly 18-month lag between filing and publication.
The trend is flat to declining rather than growing. Filings rose from 2 in 2017 to a peak of 20 in 2018, then eased to a midpoint of 11 by 2022 and stood at 9 in the latest partial year. This pattern suggests the core formulation and test-method claim space was staked out heavily around 2018 and has not seen a resurgence since, though the newest years are understated due to publication lag.
Because the underlying inventions are usually epoxy formulations — resin blends, curing agents, toughening additives — that recite a cure-monitoring, DMA/DSC or mechanical-test step as supporting evidence for how the composition performs, rather than claiming the test method itself. That is why C08L (polymer compositions) appears in 251 of 273 records while G01N (material analysis and testing) appears in only 20. A search focused purely on G01N would miss most of the relevant art in this space.
Receiving-office data shows the United States (94 filings) and India (47) well ahead of Europe (37), WIPO/PCT (29), Japan (15) and Canada (11). A filing strategy built only around the US and Europe would miss a substantial share of where this corpus actually sits, particularly the India volume. That said, receiving-office counts reflect where applicants chose to file, not necessarily where enforcement or manufacturing risk is highest.
US7615595B2 claims an epoxy adhesive composition built from a first epoxy resin, a second epoxy resin modified with a diene-based copolymer, a phenolic-terminated elastomeric toughener, and a polyester-segment polymer with defined crystallinity and softening range, specifically for bonding vehicle parts without prehardening. Anyone formulating a multi-component toughened epoxy adhesive for automotive bonding should check their composition against this specific combination of four component types and the softening-temperature range before finalising a formulation. It does not block epoxy adhesives generally — only this particular architecture and use case.
The clearest gap is in standalone G01N test-method claims: only 20 of 273 records fall there, against 251 in polymer-composition classes, meaning most cure-monitoring and inspection language is tied to a formulation claim rather than filed as an independent method. Sub-areas such as in-situ dielectric cure monitoring, automated ultrasonic defect inspection and DMA-based post-cure property prediction show thin direct coverage in this corpus. Co-assignee activity is also sparse — only 10 pairs total — suggesting joint industry-academic filing programmes remain underused as a route into this space.
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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.