B64C 27/12
Rotor drives
B64C27/12 (Rotor drives) appears on 1,149 US grants and 1,130 published applications in this corpus.
Search patents in B64C- Granted patents
- 1,149
- Published applications
- 1,130
- Assignees
- 271
- Inventors
- 1,590
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 4 | 0 |
| 1984 | 9 | 0 |
| 1985 | 7 | 0 |
| 1986 | 4 | 0 |
| 1987 | 8 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 3 | 0 |
| 1992 | 8 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 5 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 11 | 0 |
| 1999 | 8 | 0 |
| 2000 | 10 | 0 |
| 2001 | 8 | 0 |
| 2002 | 13 | 5 |
| 2003 | 6 | 9 |
| 2004 | 8 | 14 |
| 2005 | 8 | 14 |
| 2006 | 9 | 13 |
| 2007 | 11 | 16 |
| 2008 | 6 | 13 |
| 2009 | 19 | 22 |
| 2010 | 8 | 25 |
| 2011 | 20 | 17 |
| 2012 | 12 | 27 |
| 2013 | 24 | 33 |
| 2014 | 31 | 39 |
| 2015 | 55 | 52 |
| 2016 | 46 | 55 |
| 2017 | 60 | 121 |
| 2018 | 63 | 115 |
| 2019 | 77 | 93 |
| 2020 | 102 | 112 |
| 2021 | 96 | 74 |
| 2022 | 80 | 66 |
| 2023 | 81 | 65 |
| 2024 | 87 | 67 |
| 2025 | 70 | 36 |
| 2026 | 27 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Distributed propulsion system for vertical take off and landing closed wing aircraft8 Sep 2026US 12,728,983 B2Textron Innovations Inc.
- Systems and methods for tilt propellers with tilt actuator gearbox and integrated inverter18 Aug 2026US 12,709,379 B2Archer Aviation Inc.
- Systems and methods for improved rotor assembly for use with a stator11 Aug 2026US 12,703,484 B2MagLev Aero Inc.
- Modular power plant for a rotorcraft and associated rotorcraft11 Aug 2026US 12,703,500 B2Airbus Helicopters
- Rotor flight vehicle28 Jul 2026US 12,691,386 B2ACC Innovation AB
- Drive shaft with non-cylindrical shape8 Oct 2026US 2026/0309183 A1Hamilton Sundstrand Corporation
- Hybrid helicopter power plant17 Sep 2026US 2026/0274403 A1Pratt & Whitney Canada Corp.
- Systems and methods for tilt propellers with tilt actuator gearbox and integrated inverter27 Aug 2026US 2026/0249978 A1Archer Aviation Inc.
- Moving platform for transporting things27 Aug 2026US 2026/0250022 A1Skyworker Technologies Ltd.
- Vertical take-off and landing aircraft and propulsion assembly20 Aug 2026US 2026/0242058 A1Burl Aerospace Pty Ltd
Most cited
By later US patents
- Helicopter power plant control158US 3,963,372 AGeneral Motors Corporation · 1976
- Electricity generation in automated aerial vehicles124US 9,550,577 B1Amazon Technologies, Inc. · 2017
- Aerodynamically stable, VTOL aircraft112US 7,249,732 B2Ufoz, LLC · 2007
- Convertible aircraft with tilting rotors106US 6,276,633 B1Eurocopter · 2001
- Quiet vertical takeoff and landing aircraft using ducted, magnetic induction air-impeller rotors101US 7,032,861 B22006