B64C 27/41
With flapping hinge or universal joint, common to the blades
Official title: with flapping hinge or universal joint, common to the blades
B64C27/41 (With flapping hinge or universal joint, common to the blades) appears on 112 US grants and 87 published applications in this corpus.
Search patents in B64C- Granted patents
- 112
- Published applications
- 87
- Assignees
- 49
- Inventors
- 172
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 6 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 3 |
| 2004 | 3 | 2 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 2 |
| 2008 | 0 | 1 |
| 2009 | 0 | 3 |
| 2010 | 0 | 3 |
| 2011 | 1 | 1 |
| 2012 | 3 | 2 |
| 2013 | 3 | 2 |
| 2014 | 0 | 9 |
| 2015 | 5 | 7 |
| 2016 | 6 | 4 |
| 2017 | 2 | 3 |
| 2018 | 7 | 10 |
| 2019 | 9 | 5 |
| 2020 | 2 | 6 |
| 2021 | 8 | 5 |
| 2022 | 3 | 3 |
| 2023 | 8 | 8 |
| 2024 | 4 | 3 |
| 2025 | 4 | 2 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Multicopter with self-adjusting rotors8 Sep 2026US 12,730,452 B2Kitty Hawk Corporation
- Drive unit for a rotary-wing aircraft, and rotary-wing aircraft5 May 2026US 12,617,525 B2Flynow Aviation GmbH
- Rotor with offset28 Apr 2026US 12,612,157 B1Textron Innovations Inc.
- Four-bar flapping rotors for aircraft and associated methods20 Jan 2026US 12,528,578 B2The Boeing Company
- Rotor assembly25 Nov 2025US 12,479,570 B2Supernal, LLC
- Flybar Apparatus30 Jul 2026US 2026/0217394 A1University of Washington
- Propulsor drive shaft with branched portion23 Jul 2026US 2026/0208859 A1Beta Air, LLC
- Four-bar flapping rotors for aircraft and associated methods23 Apr 2026US 2026/0109457 A1The Boeing Company
- Four-bar flapping rotors for aircraft and associated methods28 Aug 2025US 2025/0269952 A1The Boeing Company
- Multicopter with self-adjusting rotors20 Mar 2025US 2025/0093878 A1Kitty Hawk Corporation
Most cited
By later US patents
- Main rotor system for model helicopters58US 5,879,131 A1999
- Folding of rotorcraft rotor blades53US 9,156,545 B1Bell Helicopter Textron Inc. · 2015
- Autogyro aircraft52US 5,301,900 A1994
- Link and bearing for rotary coupling43US 5,186,686 ALord Corporation · 1993
- Elastomeric system for mounting a helicopter rotor40US 4,522,563 ABell Helicopter Textron Inc. · 1985