B64C 27/39
With individually articulated blades, i.e. with flapping or drag hinges
Official title: with individually articulated blades, i.e. with flapping or drag hinges
B64C27/39 (With individually articulated blades, i.e. with flapping or drag hinges) appears on 70 US grants and 65 published applications in this corpus.
Search patents in B64C- Granted patents
- 70
- Published applications
- 65
- Assignees
- 33
- Inventors
- 145
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 1 | 1 |
| 2010 | 1 | 2 |
| 2011 | 1 | 2 |
| 2012 | 1 | 1 |
| 2013 | 0 | 3 |
| 2014 | 3 | 1 |
| 2015 | 2 | 5 |
| 2016 | 1 | 7 |
| 2017 | 4 | 2 |
| 2018 | 7 | 3 |
| 2019 | 6 | 15 |
| 2020 | 11 | 2 |
| 2021 | 7 | 3 |
| 2022 | 0 | 4 |
| 2023 | 7 | 4 |
| 2024 | 3 | 3 |
| 2025 | 1 | 1 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Fast response rotor system5 May 2026US 12,617,526 B2The United States of America as represented by the Secretary of the Army
- 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
- Control device and system for rotor blades7 Oct 2025US 12,434,825 B2Board of Regents, The University of Texas System
- Flight-enabled signal beacon6 Aug 2024US 12,054,252 B2Yana Sos, Inc.
- Swashplateless helicopter and control method thereof27 Aug 2026US 2026/0249987 A1Guangzhou Walkera Technology Co., Ltd
- 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
- Control device and system for rotor blades26 Dec 2024US 2024/0425176 A1Board of Regents, The University of Texas System
- Flight-enabled signal beacon24 Oct 2024US 2024/0353863 A1Yana Sos, Inc.
Most cited
By later US patents
- Methods and apparatus for vertical short takeoff and landing26US 8,979,016 B2Radeus Labs, Inc. · 2015
- Method of fabricating a helicopter rotor system22US 4,868,962 AThe Boeing Company · 1989
- Propeller units18US 10,137,982 B1Wing Aviation LLC · 2018
- Hub assembly18US 4,156,583 AKaman Aerospace Corporation · 1979
- Hub assembly18US 4,306,836 AKaman Aerospace Corporation · 1981