Glass Fiber and Epoxy Systems for Wind Blades Patents: Leaders, Trends & White Space 2026
- Flat, not booming. Filings peaked in 2020 at 14 and have declined since, with 2022's midpoint at 8 — this is a mature claim space, not a growth curve.
- No dominant gatekeeper. The leader holds only 14 records and the top 5 combined account for 13.8% of all 427 records in scope, so no single assignee controls the field.
- Polymer processing outweighs glass chemistry. C08J and C08L each cover roughly 30% of records, while glass-specific C03C sits at 21.8% — most claim activity is in resin formulation, not fiber science.
What this landscape covers
This dataset tracks 427 published records at the intersection of glass fiber reinforcement and epoxy or infusion resin systems used in wind turbine blades, filtered specifically for language around infusion viscosity, pot life, exotherm control, fatigue performance, recyclable resin chemistry and blade length scaling. The scope spans filings from 2015 through the 2026-07-31 cut-off, though publication lags filing by roughly 18 months, so the most recent year is always undercounted relative to where it will eventually land.
Records here carry classes spanning polymer processing, polymer compositions, condensation polymers, glass and enamel compositions, plastics shaping and layered laminates — reflecting that a blade resin patent typically touches formulation chemistry, cure behaviour, and composite structure at once rather than any single discipline.
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Filing trend and technology composition
Two views of the same 427 records: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
Filing trend, 2017-2026
Filings opened this window at 11 in 2017, rose to a peak of 14 in 2020, and have since drifted down through a midpoint of 8 in 2022 to 3 in the partial 2026 count — a pattern consistent with a field settling into incremental refinement rather than expansion.
IPC subclass composition
C08J (polymer processing and solutions) and C08L (polymer compositions) each appear in close to a third of records, C08G (condensation polymers, the epoxy backbone chemistry) in just over a quarter, and C03C (glass and enamel compositions) in about a fifth — since records carry multiple classes, these shares sum past 100% of the 427-record total by design.
Shares are the percentage of the 427 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Glass Fiber and Epoxy Systems for Wind Blades with Eureka
This page is one run against one query. Ask Eureka your own question about glass fiber and epoxy systems for wind blades and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
US4868063A — Glass fiber article-coating compositions
A composition for coating glass fiber articles such as glass sleeve, glass cloth, glass roving, glass tape, glass mat or glass nonwoven fiber, comprising a vinyl-terminated diorganopolysiloxane, an organohydrogenpolysiloxane cross-linker providing at least 0.5 silicon-bonded hydrogen atoms per vinyl radical, and a catalytic amount of platinum or a platinum compound.Filed by Shin-Etsu Chemical, published 1989-09-19 — a coating-chemistry filing that predates the modern wind-blade infusion focus of this dataset but anchors the glass-fiber-coating side of the claim space.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US7171087B2 | Optical fiber cable | 251 |
| 2 | US20040034154A1 | Epoxide-type formaldehyde free insulation binder | 117 |
| 3 | US5520422A | High-pressure fiber reinforced composite pipe joint | 112 |
| 4 | US4361613A | Composite construction materials with improved fire resistance | 109 |
| 5 | US4803819A | Utility pole and attachments formed by pultrusion of dielectric insulating plastic, such as glass fiber reinf… | 108 |
| 6 | US4128527A | Dynamoelectric machine having coil windings and core encapsulated with resin-filler composition | 103 |
| 7 | US3602364A | Segmented belt | 101 |
| 8 | US5087405A | In mold overlay process for gel coated glass fiber reinforced laminates | 94 |
| 9 | US4387311A | Uninflammable dynamoelectric machine having coil windings and core encapsulated with unsaturated polyester re… | 84 |
| 10 | US20050228108A1 | Glass mat laminate comprised of polymerizable cyclic polyester oligomers suitable for composites with a Class… | 81 |
Citation counts accumulate over time and favour older filings; treat them as a signal of influence within this corpus, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once filing volume, IPC composition and citation weight are read together.
No single assignee controls the field
The leader holds 14 records against a total of 427, and the top 5 combined reach only 13.8% of all records in scope. That is a fragmented ownership structure — freedom-to-operate risk comes from density of prior art in specific IPC subclasses, not from one blocking portfolio.
Filing activity has cooled since 2020
The peak year was 2020 at 14 filings, and the 2022 midpoint of 8 already signalled the decline continuing toward the partial 2026 count. Recent-year momentum by named assignee in this dataset shows zero new filings from several previously active companies in the latest year — consistent with a plateauing rather than an emerging technology.
Resin processing dominates over glass chemistry
C08J (polymer processing and solutions) and C08L (polymer compositions) each sit near 30% of records, well ahead of C03C (glass and enamel compositions) at 21.8%. Claim activity concentrates on how the resin is processed and formulated, not on the fiber substrate itself — a useful signal for where prior art is thinnest.
Filing is spread across major offices, led narrowly by Japan
Japan (107) and the United States (103) lead receiving-office counts, with Europe (56), China (43), WIPO/PCT (22) and Canada (21) behind. No single jurisdiction dominates the way a single assignee might, which matters for where defensive filing or freedom-to-operate searches need to run.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to glass fiber and epoxy systems for wind blades, with the prior art for and against each one.
Who is filing, and where the gate sits
The assignee ranking spans 100 companies counted by record, none of them commanding a dominant share.
A modest lead, not a moat
The top-ranked assignee holds 14 of the 427 records in scope — enough to lead the ranking but far short of the kind of concentration that would force competitors to design entirely around one portfolio.
A gradual taper, not a cliff
Fifth place holds 10 records and tenth place holds 7 — the drop from leader to tenth is gradual, indicating a broad group of moderately active filers rather than a sharp leader-then-tail structure.
A long tail of single- and few-filing entrants
Beyond the top 10, the ranking extends across 100 companies total, most holding only a handful of records each. That long tail typically signals specialist or regional filers working narrow chemistry niches rather than platform-scale resin developers.
| Assignee | Recent year | YoY |
|---|---|---|
| Owens Corning Fiberglas Corp | 0 | — |
| Central Glass Co., Ltd. | 0 | — |
| Zeon Corp | 0 | — |
| C-TECH LTD | 0 | — |
| Rohm and Haas Co. | 0 | — |
| Akzo Nobel Coatings International B.V. | 0 | — |
| DSM N.V. | 0 | — |
| Dow Corning Toray Silicone Co., Ltd. | 0 | — |
Where to take this analysis
The landscape points to specific next steps depending on whether the goal is freedom-to-operate, white-space filing, or competitive tracking.
Run a freedom-to-operate check on C08J/C08L claims
With close to a third of records touching polymer processing and composition classes, a targeted FTO search on these two subclasses will surface the densest prior art before committing to a specific resin formulation.
Explore in EurekaMap the long tail for acquisition or licensing targets
The 100-company ranking's gradual taper below the top 10 suggests specialist filers holding narrow but potentially valuable chemistry positions worth individual diligence.
Explore in EurekaTrack momentum shifts before the next filing cycle
Given the decline from a 2020 peak of 14 filings, watching which assignees resume activity first can flag where the next wave of blade resin innovation will concentrate.
Explore in EurekaCommon questions on this landscape
The assignee ranking in this dataset covers 100 companies, and the top-ranked one holds 14 of the 427 records in scope, with fifth place at 10 and tenth place at 7. That is a gradual taper rather than a sharp cliff, meaning no single company controls the field the way a dominant platform holder might in other sectors. The top 5 combined account for 13.8% of all records, and the top 10 combined for 23.2%, so most of the landscape sits with mid-size and small filers rather than a handful of giants.
Filing activity peaked in 2020 at 14 records and has declined since, with the 2022 midpoint at 8 and the partial 2026 count at only 3. Because publication typically lags filing by around 18 months, the most recent year or two will always look thinner than they eventually turn out to be, but the multi-year decline from the 2020 peak is a real trend rather than an artefact of lag alone. Recent-year momentum data also shows several previously active assignees recording zero filings in the latest year, reinforcing a cooling rather than accelerating pattern.
Start with C08J (polymer processing and solutions) and C08L (polymer compositions), each covering roughly 30% of the 427 records in scope, followed by C08G (condensation polymers, the epoxy backbone chemistry) at about a quarter. C03C (glass and enamel compositions) and B29C (shaping of plastics) are the next tier, each covering around a fifth of records. Because a single record can carry several IPC classes, these percentages sum to more than 100% of the record total — search across the top three or four classes together rather than relying on any one in isolation.
The technology composition data shows dense coverage in general polymer processing and composition classes but comparatively thin representation in more specific sub-areas like recyclable resin chemistry for blade decommissioning, exotherm control for thick-section infusion, and cure kinetics tied to blade-length scaling. These are areas explicitly named in the search scope but not reflected as dedicated IPC concentrations, suggesting claim language there is less crowded. A first claim in one of these branches would typically need to tie a specific chemistry or process parameter (such as a controlled exotherm profile or a defined recyclability mechanism) to a measurable blade-manufacturing outcome to stand apart from the generic polymer-composition prior art.
Not necessarily. The most-cited records in this dataset, such as the optical fiber cable and composite pipe joint patents, accumulated their citation counts over long periods within the searched corpus, which structurally favours older filings that have had more time to be cited. A high citation count signals historical influence on the surrounding art, not that the underlying claims remain commercially central today. For current relevance, filing recency and IPC alignment with today's blade resin chemistry are more informative than raw citation totals.
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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.