Wind Turbine Bearings Patents: Top Companies & Filing Trends 2026
- Filing has plateaued, not grown. 2023 was the peak year at 148 filings; by the 2022 midpoint of 146, the trend was already flat rather than climbing, and 2026 volume (25, still partial) sits well below peak.
- No single company dominates. The leader holds 110 of 4,532 records; the top 5 combined account for just 9.9% of all records in scope, and the top 10 for 16.2% — a long tail of single- and few-filing entrants makes up the rest.
- Bearing-specific claims share space with adjacent turbine mechanics. F16C (shafts, bearings & couplings) and F16H (gearing & transmissions) each cover 10.8% of records, while F03D (wind motors) leads at 17.4% — bearing claims sit inside a wider drivetrain and turbine-systems filing pattern, not apart from it.
What this dataset covers
This landscape draws on 4,532 published records filed between 2015 and mid-2026, captured through a search combining wind turbine bearing terms — main shaft bearing, pitch and yaw bearing — with technical qualifiers including white etching crack, lubrication, bearing life, 20-year design life, large-diameter manufacturing and condition monitoring. The scope is deliberately narrow: it targets the intersection of bearing hardware and the operational problems specific to utility-scale wind turbines, not bearings generally.
Because publication lags filing by roughly 18 months, the 2025 and 2026 filing counts in this dataset understate real activity; treat the most recent one to two years as a floor, not a ceiling.
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Filing trend and technology composition
Two views of the same 4,532 records: how filing volume has moved year over year, and how those records distribute across IPC subclasses.
A decade of filing activity, now past its peak
Annual filings rose from 101 in 2017 to a peak of 148 in 2023, with the 2022 midpoint already at 146 — indicating the growth phase had largely finished before the peak year. Filing has since eased off, with 2026 (partial year) at 25.
Bearing hardware sits alongside broader turbine and drivetrain classes
F03D (wind motors) is the largest single class at 17.4% of the 4,532 records in scope, followed by B64C (aeroplanes & helicopters) at 12.3% — a reminder that condition-monitoring and lubrication claims transfer across rotating-machinery domains. F16C and F16H, the two classes closest to bearing and gearing hardware itself, each sit at 10.8%. Marine propulsion (B63H, 5.4%) and turbine/pump classes (F01D, F04D, F04C, each under 5%) round out the smaller adjacent branches.
Shares are the percentage of the 4,532 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Wind Turbine Bearings with Eureka
This page is one run against one query. Ask Eureka your own question about wind turbine bearings and every answer comes back with the patent numbers behind it.
Try EurekaA representative filing and the most-cited prior art
US20170234304A1 — Condition monitoring system and wind power generation system comprising the same
A condition monitoring system for a wind turbine comprises a sensor which senses a condition of a yaw bearing, a monitor device which generates a diagnosis parameter based on the sensor output, a second sensor sensing rotating angular velocity of the nacelle and main shaft, and a data server that diagnoses a yaw bearing failure based on the variation of the diagnosis parameter from an initial value when the nacelle and main shaft are within prescribed velocity ranges.Filed by NTN Corporation, published 2017-08-17.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4941826A | Apparatus for indirect dental machining | 535 |
| 2 | US4303978A | Integrated-strapdown-air-data sensor system | 330 |
| 3 | US5155423A | Industrial robot with servo | 314 |
| 4 | US4529407A | Fuel pellets | 246 |
| 5 | US6921985B2 | Low voltage ride through for wind turbine generators | 223 |
| 6 | US6045165A | Threaded connection tubular goods | 155 |
| 7 | US20040007644A1 | Rotor craft | 149 |
| 8 | US5479997A | Earth-boring bit with improved cutting structure | 140 |
| 9 | US4973215A | Industrial robot with servo | 139 |
| 10 | US20070216164A1 | Variable speed wind turbine having an exciter machine and a power converter not connected to the grid | 137 |
Citation counts inside a searched corpus favour older records; read them as a signal of influence on later filings, not as a measure of current 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 filing strategy
Three patterns worth acting on before drafting new claims in this space.
Leadership is real but thin
The leading assignee holds 110 records against a field of 4,532 — a meaningful lead, but not a moat. With the top 5 combined at only 9.9% and the top 10 at 16.2%, most of the corpus is held by a long tail of companies with a handful of filings each, which means freedom-to-operate analysis has to look well past the household names.
Even the leader is pulling back
The top-ranked assignee filed 12 records in the latest year, down 20% year-on-year, and several other prominent names in the ranking show zero filings in the latest year. Combined with a filing trend that peaked in 2023, this points to a technology area where the core patentable ground has already been claimed rather than one still being actively built out.
Bearing claims travel with system-level turbine claims
Records in this corpus routinely carry multiple IPC classes, and the largest class by far is F03D (wind motors) rather than a narrower bearing-specific code. That overlap signals that condition monitoring and lubrication innovations are frequently claimed as part of a wind turbine system, not as standalone bearing components — a distinction that matters when scoping a claim set.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to wind turbine bearings, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked leaders span turbine OEMs, bearing manufacturers and aerospace-adjacent filers whose rotating-machinery patents cross into wind applications.
Bearing manufacturers file narrowly, OEMs file broadly
Dedicated bearing manufacturers tend to cluster around F16C and lubrication/condition-monitoring claims, while wind turbine OEMs and their renewables subsidiaries spread filings across F03D system claims and drivetrain mechanics. The presence of aerospace names in the ranking reflects shared rotating-machinery problems — main shaft bearing life and condition monitoring — rather than direct wind turbine manufacturing.
Several established filers have gone quiet
Multiple assignees within the ranked leaders show zero filings in the latest year, including names with substantial historical volume. That does not necessarily mean exit from the field — publication lag means recent filings may not yet be visible — but it does mean current assignee-level activity should be checked against filing dates, not just cumulative totals.
Collaboration is concentrated within single corporate families
The strongest co-assignee pairings in this dataset link a parent filer with its own regional or divisional subsidiaries, rather than cross-company joint filings. That pattern suggests most of the collaborative filing here reflects internal corporate structure and multi-jurisdiction strategy rather than genuine technology-sharing partnerships between competitors.
| Assignee | Recent year | YoY |
|---|---|---|
| General Electric Co | 12 | -20% |
| NTN Corp | 0 | — |
| Pratt & Whitney Canada Corp | 0 | — |
| Vestas Wind Systems A/S | 0 | — |
| NSK Ltd | 0 | — |
| Safran Aircraft Engines SAS | 0 | -100% |
| Snecma | 0 | — |
| General Electric Renovables Espana SL | 0 | -100% |
Where to take this analysis
The trend and composition data point to specific next steps depending on what you're trying to decide.
Check freedom-to-operate against the long tail
With only 16.2% of records held by the top 10 assignees, a freedom-to-operate review that stops at the household names will miss most of the field. Screen the full ranked set, not just the leaders.
Run an assignee search in EurekaValidate white space claims before drafting
Under-claimed branches such as large-diameter manufacturing tolerances or retrofit sensor packages look open in aggregate counts, but a claim-level check is needed before relying on that gap.
Explore claim charts in EurekaRe-check momentum once lag clears
Several assignees show zero filings in the latest year, which may reflect publication lag rather than exit. Revisit assignee momentum once another 12-18 months of publications land.
Track filing trends in EurekaCommon questions on wind turbine bearing patents
The leading assignee in this dataset holds 110 of the 4,532 records in scope, but no single company dominates the field. The top 5 assignees combined account for only 9.9% of all records, and the top 10 for 16.2%, meaning the majority of filings sit with a long tail of companies each holding a small number of records. Any competitive analysis needs to look past the largest names to that broader set of filers.
No. Filing rose from 101 records in 2017 to a peak of 148 in 2023, but the 2022 count of 146 was already close to that peak, indicating the growth phase ended before 2023. Filing volume has eased since, and while the most recent year is understated by the roughly 18-month lag between filing and publication, the overall trajectory is flat to declining rather than expanding.
US20170234304A1, filed by NTN Corporation, covers a condition monitoring system that diagnoses yaw bearing failure using a sensor on the yaw bearing plus a second sensor tracking nacelle and main shaft angular velocity, comparing the diagnosis parameter against an initial baseline within prescribed velocity ranges. It is a system-level claim tied to a specific diagnostic method rather than a bearing hardware claim, so it primarily constrains condition-monitoring approaches using comparable velocity-gated baseline comparisons rather than yaw bearing design generally. Anyone building a yaw bearing monitoring system should review its specific claim language on velocity range gating before assuming a workaround exists.
Based on filing density relative to the core condition-monitoring and lubrication claims, areas including white etching crack mitigation coatings, large-diameter bearing manufacturing tolerances, retrofit condition-monitoring sensor packages, and 20-year design-life validation protocols show comparatively lower filing density. Lower density is not proof of open claim space on its own — it needs to be verified against actual claim scope in adjacent filings before a company relies on it for freedom-to-operate. It is a useful starting point for prioritising a deeper search, not a substitute for one.
The search underlying this dataset pulls in aerospace assignees such as Pratt & Whitney Canada and Safran Aircraft Engines, and marine propulsion class B63H accounts for 5.4% of records, because the underlying technical problems — main shaft bearing life, lubrication under variable load, condition monitoring — recur across rotating machinery in aircraft engines, marine propulsion and wind turbines alike. B64C (aeroplanes & helicopters) is in fact the second-largest class in this corpus at 12.3% of records. That overlap means prior art searches for wind turbine bearing claims should routinely check aerospace and marine filings, not just wind-specific ones.
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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.