Glass Fiber Reinforcement Patents: Top Companies & Trends 2026
- 42.2% of all 135 records sit with just the five leading assignees, while a long tail of single-filing entrants makes up most of the 93-company ranking.
- Filing peaked in 2020 at 11 records and has since flattened, with the 2022 midpoint down to a single filing — a sign the core composition space is largely staked out.
- Glass composition claims (C03C) cover 30.4% of records far ahead of downstream infrastructure-integration classes like road/rail accessories and pipe fittings, which remain comparatively thin.
A composition-heavy field with a thin downstream layer
Glass fiber reinforcement patenting for wind and infrastructure applications concentrates on base glass chemistry rather than end-use integration. Across the 135 records in scope, claims cluster around high-modulus oxide compositions, sizing and coating chemistry, and polymer-matrix additive packages, with downstream application claims — road and rail hardware, pipe fittings — trailing well behind. The pattern suggests a technology where the raw material has been heavily claimed while its infrastructure applications remain comparatively open.
Filing activity peaked in 2020 and has since flattened, and the assignee ranking is concentrated at the top without being closed off: roughly half the field's records sit outside the ten leading assignees. That combination — dense composition claims, thin integration claims, and a long tail of single filers — shapes where new filings are likely to clear versus collide with existing scope.
Filing trends and technology composition
The 135 records in scope span 2015 through the 2026 cut-off, with publication lag meaning the most recent year understates real filing activity. Technology composition is read from IPC subclasses, where a single record can carry several classes.
Filing activity has flattened since a 2020 peak
Filings ran from 5 in 2017 to a peak of 11 in 2020, then dropped to 1 at the 2022 midpoint and further through the most recent partial year — a pattern consistent with a field where core composition claims are largely staked out rather than one still building momentum.
Glass composition dominates, application classes trail
Glass and enamel compositions (C03C) carry 30.4% of the 135 records in scope, well ahead of polymer additive (C08K, 17.0%) and polymer composition (C08L, 14.1%) classes. Downstream application classes such as road/rail accessories (E01F, 9.6%) and pipe fittings (F16L, 5.9%) are comparatively thin, pointing to where integration claims remain open.
Shares are the percentage of the 135 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Glass Fiber Reinforcement for Wind and Infrastructure with Eureka
This page is one run against one query. Ask Eureka your own question about glass fiber reinforcement for wind and infrastructure and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
High modulus glass fiber composition, and glass fiber and composite material thereof (CA3010734C)
A high-modulus glass fiber composition, and a glass fiber and composite material made from it. The composition is defined by weight-percent ranges for SiO2, Al2O3, a combined Y2O3 and La2O3 fraction (with La2O3 capped below 1.8%), CaO+MgO+SrO, alkali oxides and Fe2O3, plus a ratio condition requiring Y2O3/(Y2O3+La2O3) above 0.5. The stated effect is a significant increase in elastic modulus alongside a reduced liquidus and forming temperature, with lower crystallization and bubble rates under equivalent conditions.Filed by Jushi Group Co., Ltd., published 2019-07-16.
View full filing in Eureka| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4568245A | Composite helicopter rotor hub | 78 |
| 2 | US3853605A | Process for applying a coating composition to glass fibers and the resulting coated fibers | 49 |
| 3 | US3920879A | Glass fiber filled polyamide composites | 43 |
| 4 | EP1288260A1 | Flame retardant compositions | 29 |
| 5 | US3718449A | Sizing, coating and combined sizing and coating composition for glass fibers | 27 |
| 6 | CN103709659A | 玻纤增强PBT/PET合金材料 | 25 |
| 7 | WO2003020826A1 | Flame retardant compositions | 25 |
| 8 | US3925286A | Sizing, coating and combined sizing and coating composition for glass fibers | 24 |
| 9 | US5590225A | Plastic holder for bearing | 22 |
| 10 | US20120048455A1 | Thermoplastic pipe made with commingled glass fibers | 20 |
Citation counts favour older records in any searched corpus; treat them as a signal of historical influence rather than current filing risk.
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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Read together, the concentration, composition and citation data point to a field where base glass chemistry is well claimed and downstream integration is not.
Filing is concentrated but not locked up
The five leading assignees hold 42.2% of the 135 records in scope, and the ten leading assignees hold 50.4%. That leaves roughly half the field spread across a long tail of single- or double-filing entrants, which is where freedom-to-operate work should focus rather than only on the leader.
Base glass chemistry carries the deepest prior art
Glass and enamel composition claims are the single largest IPC category in this dataset. New base-glass filings, especially rare-earth-modified high-modulus formulations, are the most likely to run into an existing claim and the hardest to design around cleanly.
Growth has flattened since the 2020 peak
Filing volume dropped to 1 record at the 2022 midpoint and has stayed low into the most recent years, though publication lag of roughly 18 months means the latest year or two will always understate true activity. The pattern still points to a maturing rather than expanding filing wave.
Influence sits with decades-old foundational patents
The most-cited records in this dataset are older sizing, coating and composite-structure patents rather than recent filings. That is typical of citation counts inside any searched corpus — they favour age, not current commercial relevance — so treat the citation leaders as historical foundations, not as the active claim risk.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to glass fiber reinforcement for wind and infrastructure, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Owens Corning Fiberglas Corporation | PRIEST JAMES R | 1 |
| Owens Corning Fiberglas Corporation | LEHMAN RICHARD N | 1 |
| OCV Intellectual Capital, LLC | ROCHER GILLES | 1 |
| OCV Intellectual Capital, LLC | RENAUD CLAUDE | 1 |
| OCV Intellectual Capital, LLC | BISSONNAT PHILIPPE | 1 |
Only 5 co-assignee pairs appear across the whole corpus, each linked to a single shared filing, indicating most development here is filed solo rather than through joint ventures or research partnerships.
Who holds the claims, and where the field is still open
The ranking spans 93 companies built from the 135 records in scope. A small group of repeat filers dominates the composition space; most of the rest of the field files once or twice and does not return.
One filer sets the pace in high-modulus composition
The leading assignee's filing volume is built on high-modulus glass composition claims of the kind seen in the representative filing, with narrow oxide-ratio windows that are difficult to design around without moving outside the claimed ranges entirely.
A moderate second tier, then a steep drop-off
Filing volume falls quickly after the leading few assignees — from 32 at the top to single digits by fifth place and further down by tenth place — indicating that most competitive activity beyond the leader is dispersed rather than concentrated in a clear number-two.
Most named assignees filed once or twice
With 93 companies ranked against 135 total records, the majority of assignees appear only a handful of times each. That long tail includes universities, regional manufacturers and individual inventors rather than repeat corporate filers.
| Assignee | Recent year | YoY |
|---|---|---|
| Jushi Group Co., Ltd. | 0 | — |
| 3M Company | 0 | — |
| United Technologies Corporation | 0 | — |
| Neptco JV LLC | 0 | — |
| Owens Corning Fiberglas Corporation | 0 | — |
| PPG Industries, Inc. | 0 | — |
| OCV Intellectual Capital, LLC | 0 | — |
| Korea Glass Fiber Co., Ltd. | 0 | — |
Where to take this next
The dataset points to specific follow-up work depending on whether the goal is freedom-to-operate, white-space filing, or monitoring.
Run a freedom-to-operate check on C03C composition claims
With 30.4% of records in the glass composition class and the leader holding narrow oxide-ratio claims, any new high-modulus formulation should be checked against the leading assignees' exact weight-percent windows before filing.
Check claim scope in EurekaScope a filing in infrastructure integration
Road/rail accessory and pipe-fitting classes remain thin relative to composition and polymer classes, and co-assignee activity is rare across the corpus, suggesting room for a claim that ties fiber chemistry to a specific infrastructure component.
Explore white space in EurekaTrack the leader's future filings
With the top assignee holding 32 of 135 records and the field's overall filing rate flattening since 2020, monitoring the leader's next filings is the most direct way to see where composition claims move next.
Set up monitoring in EurekaFrequently asked questions
The assignee ranking for this dataset covers 93 companies, with the leading filer holding 32 of the 135 records in scope. Filing is concentrated at the top: the five leading assignees together account for 42.2% of all records, and the ten leading assignees account for 50.4%. Beyond that top group there is a long tail of assignees with only one or two filings each, so most named entities in this field are single-filing entrants rather than repeat filers.
Glass and enamel composition claims (IPC class C03C) are the largest single category, covering 30.4% of the 135 records in scope. Polymer-side claims split across additive formulations (C08K, 17.0%) and polymer compositions (C08L, 14.1%), while shaping and layering classes (B29C, B32B) and infrastructure-specific classes (E01F, F16L) trail behind. Because a single record can carry multiple IPC classes, these shares add up to more than 100% of the record total.
Filing peaked in 2020 at 11 records and has trended down since, with the 2022 midpoint showing just 1 record and later years lower still. Publication typically lags actual filing by around 18 months, so the most recent year or two in any such trend will always look thinner than the true filing rate. Taken together with the flat-to-declining pattern from the peak, this points to a maturing rather than an expanding filing wave.
CA3010734C, assigned to Jushi Group, claims a high-modulus glass fiber composition defined by weight-percent ranges for SiO2, Al2O3, a combined Y2O3+La2O3 fraction, alkaline-earth oxides, alkali oxides and Fe2O3, plus a ratio condition between Y2O3 and La2O3 above 0.5. Any formulation landing inside all of those ranges simultaneously sits within the claim, but it is a composition claim only — it does not reach processing methods, sizing chemistry outside that composition, or end-use integration into pipes, road hardware or blade structures built on a different base glass.
The thinnest branches relative to the rest of the field are downstream integration classes — road and rail accessory hardware (E01F, 9.6% of records) and pipe fittings (F16L, 5.9%) — compared with the dense composition and polymer-additive classes above them. Only five co-assignee pairs appear across the whole corpus, suggesting most filing here happens solo rather than through joint development, which is itself a sign this sub-area has not yet attracted the collaborative filing typical of a mature niche. A first claim here would do better tying a specific fiber or sizing chemistry to a defined infrastructure component than trying to claim fiber chemistry alone.
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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.