Helicopter main rotor blade design patents: concentration at the top, room at the edges
70.9% concentration. the top 5 of 62 ranked assignees hold 173 of 244 records in scope — filing here means facing entrenched claim positions from the outset. Filings rose to a peak of 10 in 2018 and have since declined; the most recent year shown is partial because publication typically lags filing by around 18 months, so recent-year counts understate real activity.
- 1SIKORSKY AIRCRAFT CORP68
- 2BELL HELICOPTER TEXTRON INC43
- 3HONTEK CORP35
- 4THE BOEING CO15
- 5UNITED TECH CORP12
See the full helicopter main rotor blade design analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about rotor blade patent activity
Who holds the most patents on helicopter main rotor blade design?
The dataset ranks 62 assignees across 244 records, and filing is heavily concentrated: the top five assignees together hold 173 records, or 70.9% of everything in scope. The leading assignee alone accounts for 68 records, more than five times the count at fifth place. This concentration reflects decades of continuous rotorcraft programme filings by major airframe manufacturers rather than a recent surge from any single company.
Is helicopter rotor blade technology still being actively patented?
Filing peaked in 2018 at 10 records in this dataset and has since tapered, with every leading assignee showing zero filings in the most recent year on record. That said, publication typically lags actual filing by around 18 months, so recent years are undercounted rather than genuinely inactive. The honest read is that the field has slowed from its earlier pace, not that R&D has stopped.
What parts of rotor blade design are least covered by existing patents?
Relative to the aerodynamic and structural core classified under B64C (79.9% of records), adjacent areas like coatings for erosion protection (B05D, 8.6%) and metal-working fabrication methods (B23P, 4.1%) carry a smaller filing footprint. Sub-areas such as anhedral blade tip geometry, blade tracking adjustment mechanisms and composite spar repair also show comparatively less concentrated activity, making them worth closer freedom-to-operate review before assuming they are blocked.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Helicopter Main Rotor Blade Design covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.