Segmented Wind Blade Patents: Top Companies & Trends 2026
Filing growth compares 2021 (61 records) with 2024 (23) — 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 552 records in scope (CR5), not by the ranked leaders only.
What the segmented blade filing record shows
Segmented wind turbine blade design — building a rotor blade from separately manufactured sections joined at a spar, shear web or spanwise seam — became a distinct filing category as blade lengths outgrew single-piece manufacturing and transport limits. The 552 records in scope span 2015 to mid-2026 and cluster heavily around the mechanical joint itself: wind-motor structural claims (F03D) appear in 85.1% of records, well ahead of the plastics-shaping and composite-article classes that describe how the segments are actually formed. That gap between structural claims and manufacturing-process claims is one of the clearest signals in the dataset.
Filing activity peaked in 2018 at 87 records and has since declined, falling from 61 records in 2021 to 23 in 2024 — a drop the evidence ties directly to slower joint filings rather than to the field shrinking outright. Because publication trails filing by roughly 18 months, the 2025 and 2026 counts are not yet complete and should not be read as a continued decline.
Filing trend and technology composition
Two views of the same 552-record dataset: the yearly filing count, and the IPC subclasses that describe what applicants are actually claiming.
A 2018 peak followed by a documented pullback
Annual filings rose to 87 in 2018, then eased across the following years; the 2021-to-2024 span alone shows a 62% fall, from 61 records to 23. Treat 2025 and 2026 as undercounted rather than as evidence the category has gone quiet.
Structural claims dominate; manufacturing claims trail
F03D (wind motors) touches 85.1% of the 552 records, confirming that most filings are framed as turbine-structure claims. B29C (plastics shaping, 14.5%) and B29D (specific plastic articles, 6.3%) show a much smaller but persistent cluster of process-side filings around composite segment fabrication.
Shares are the percentage of the 552 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Wind-Turbine Blades: Segmented Wind Blade Patent Landscape with Eureka
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Try EurekaThe prior art with the most citation weight
Male spar beam for a segmented wind turbine blade
A male spar beam for mutually attaching a segmented wind turbine blade, comprising a leading-edge part and a trailing-edge part, each formed integrally in one piece with upper, lower and shear walls. The two parts are joined so their lower walls form a single lower spar cap, illustrating a one-piece-per-segment approach to the spar joint rather than a bonded multi-part assembly.Filed by Blade Dynamics Limited, published 2025-07-29 as US12372056B2.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20030137149A1 | Segmented arc generator | 206 |
| 2 | US6474604B1 | Mobius-like joining structure for fluid dynamic foils | 199 |
| 3 | US20090155084A1 | Wind blade joint bonding grid | 151 |
| 4 | US7132760B2 | Wind turbine device | 124 |
| 5 | US20040061337A1 | Wind turbine device | 114 |
| 6 | US6836028B2 | Segmented arc generator | 95 |
| 7 | US7329099B2 | Wind turbine and energy distribution system | 92 |
| 8 | US4111601A | Adjustable windmill | 84 |
| 9 | US20120181792A1 | Wind turbine | 56 |
| 10 | US20120213642A1 | Segmented wind rotor blade for wind turbine generator system and assemblying method thereof | 44 |
Citation counts favour older filings that have had more time to accumulate citations inside this corpus — read them as markers of influence on later filers, not as an index of current commercial relevance.
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 a filing decision
Three findings that change where a team should file, cite, or design around.
The field is led, not fragmented
The leading assignee alone accounts for 68 records, and the top five combined hold 210 of the 552 records in scope. Half the field sits with just ten assignees. A new entrant is filing into territory already claimed densely by a small group, not into open ground.
A documented pullback, not a stalled field
Filings dropped from 61 in 2021 to 23 in 2024, a real -62% change over that span. That decline followed a 2018 peak of 87 records, suggesting the initial wave of joint-design claims has largely been staked out.
Structure is crowded; process is thinner
Wind-motor structural claims (F03D) touch the large majority of records, while plastics-shaping claims (B29C, 14.5%) and specific composite-article claims (B29D, 6.3%) cover a much smaller slice. Fabrication-method claims around the joint are comparatively less contested.
Europe and the US lead filing venues
The EPO (128 records) and the United States (120) are the largest receiving offices, with WIPO/PCT filings (62) and India (45) also carrying meaningful volume. Any freedom-to-operate check should prioritise these offices first.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to wind-turbine blades: segmented wind blade patent landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Envision Intelligent (International) Pte. Ltd. | SHANGHAI ENVISION DIGITAL CO LTD | 12 |
The strongest documented co-assignee pairing in this dataset is Envision AESC's international arm filing jointly with Shanghai Envision Digital, appearing together across 12 records — a rare instance of sustained joint filing in an otherwise single-assignee-dominated field.
Where to take this analysis
The dataset points to a few concrete next steps depending on whether the goal is freedom-to-operate, whitespace scouting, or citation tracing.
Map the joint-design claim space
With F03D structural claims covering 85.1% of records, a claim chart against the leading assignees' spar and shear-web joint patents is the fastest way to see what is actually blocked before drafting new claims.
Explore claim mapping in EurekaTrace the most-cited prior art forward
The five most-cited records anchor much of the later filing activity; running a forward-citation trace from those five surfaces which recent filings are building directly on them.
Run a citation trace in EurekaWatch the manufacturing-process gap
B29C and B29D claims sit well below F03D coverage, suggesting segment fabrication methods are comparatively less staked out than the joint structures themselves.
Scout whitespace in EurekaCommon questions on segmented wind blade patents
In this dataset, a segmented wind turbine blade is a rotor blade manufactured and/or assembled in separate sections — typically split spanwise at a spar, shear web, or root-to-tip joint — rather than as a single continuous mould. Claims cover both the mechanical joint between segments and, in a smaller share of records, the manufacturing process used to form each segment. The search captures records where this segmentation is claimed explicitly in the title or claims text.
The ranked list covers 100 assignees, all counted in records, with the leading filer holding 68 of the 552 records in scope. The top five combined account for 38.0% of all records and the top ten for 50.0%, meaning half the entire field sits with a small group of established blade and turbine manufacturers. This concentration means a new filer is almost certainly filing adjacent to, not ahead of, existing claim coverage.
Filings peaked in 2018 at 87 records and declined afterward, falling 62% from 61 records in 2021 to 23 in 2024. That is a documented pullback in the most recent complete years, not a projection. Because patent publication lags filing by roughly 18 months, the 2025 and 2026 counts in the raw data are still incomplete and should not be read as continued decline.
US12372056B2, assigned to Blade Dynamics Limited and published 2025-07-29, claims a male spar beam formed from separately-molded leading-edge and trailing-edge parts, each built in one integral piece, joined so their lower walls form a single lower spar cap. It narrows the available design space specifically around one-piece-per-segment spar construction with that lower-wall joining geometry. Designers working on alternative joint geometries, or on spar caps assembled from more than two integral pieces, sit outside this specific claim scope, though a freedom-to-operate review against the full family is still advisable.
IPC composition shows F03D (wind motors) present in 85.1% of the 552 records, while plastics-shaping (B29C) and specific composite-article claims (B29D) appear in only 14.5% and 6.3% respectively. That gap suggests the mechanical joint itself is heavily claimed while the fabrication methods used to produce individual composite segments are comparatively open. Antenna and cabling-related classes (H01Q, H02G) also appear at low single-digit shares, indicating limited claim density around blade-integrated electronics.
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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.