B64C 27/021
Rotor or rotor head construction
Official title: {Rotor or rotor head construction (for helicopters B64C27/32)}
B64C27/021 (Rotor or rotor head construction) appears on 99 US grants and 99 published applications in this corpus.
Search patents in B64C- Granted patents
- 99
- Published applications
- 99
- Assignees
- 48
- Inventors
- 122
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 2 |
| 2003 | 1 | 0 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 1 | 1 |
| 2007 | 1 | 0 |
| 2008 | 2 | 3 |
| 2009 | 3 | 2 |
| 2010 | 1 | 1 |
| 2011 | 2 | 2 |
| 2012 | 0 | 16 |
| 2013 | 4 | 2 |
| 2014 | 5 | 1 |
| 2015 | 20 | 5 |
| 2016 | 4 | 5 |
| 2017 | 5 | 5 |
| 2018 | 2 | 4 |
| 2019 | 4 | 8 |
| 2020 | 7 | 5 |
| 2021 | 4 | 4 |
| 2022 | 5 | 10 |
| 2023 | 4 | 6 |
| 2024 | 8 | 4 |
| 2025 | 8 | 6 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Autorotating payload delivery device9 Jun 2026US 12,649,569 B2AeroVironment, Inc.
- Blade pitch detection for an aerial vehicle26 May 2026US 12,637,209 B2Unmanned Aerospace LLC
- Commonly manufactured rotor blade7 Apr 2026US 12,595,048 B2Lockheed Martin Corporation
- Aerodynamic rotor blade configurations30 Dec 2025US 12,509,216 B1Wisk Aero LLC
- Rotor assembly25 Nov 2025US 12,479,570 B2Supernal, LLC
- Gyroplane take-off rotor11 Jun 2026US 2026/0159232 A1Ela Aviacion, S.L.
- Blade pitch detection for an aerial vehicle7 May 2026US 2026/0125153 A1Unmanned Aerospace LLC
- Aircraft landing site determination for automated emergency landing control2 Apr 2026US 2026/0093269 A1The Boeing Company
- Method of assemblying and operating an autorotating payload delivery device1 Jan 2026US 2026/0001645 A1AeroVironment, Inc.
- Unmanned aerial vehicle16 Oct 2025US 2025/0319968 A1Kubota Corporation
Most cited
By later US patents
- Rotor collective pitch VS Mu to control flapping and mast/rotor tilt to control rotor RPM58US 7,448,571 B1Cartercopters, L.L.C. · 2008
- Tandem-rotor gyroplane42US 6,089,501 A2000
- Hovering gyro aircraft41US 6,513,752 B2Cartercopters, L.L.C. · 2003
- Two-place, collective pitch and throttle control35US 8,844,880 B1Groen Brothers Aviation, Inc. · 2014
- Compound aircraft with autorotation30US 8,403,255 B22013