B64C 27/80
For differential adjustment of blade pitch between two or more lifting rotors
Official title: for differential adjustment of blade pitch between two or more lifting rotors
B64C27/80 (For differential adjustment of blade pitch between two or more lifting rotors) appears on 77 US grants and 96 published applications in this corpus.
Search patents in B64C- Granted patents
- 77
- Published applications
- 96
- Assignees
- 43
- Inventors
- 160
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 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 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 3 |
| 2016 | 2 | 2 |
| 2017 | 2 | 38 |
| 2018 | 0 | 6 |
| 2019 | 8 | 5 |
| 2020 | 18 | 13 |
| 2021 | 9 | 11 |
| 2022 | 10 | 7 |
| 2023 | 11 | 3 |
| 2024 | 4 | 3 |
| 2025 | 5 | 1 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Control device for aircraft23 Dec 2025US 12,503,225 B2Honda Motor Co., Ltd.
- Rotor system for electrically powered rotorcraft14 Oct 2025US 12,441,464 B1SiFly Aviation, Inc.
- Helicopter rotor system30 Sep 2025US 12,428,142 B2Eagle Technologies, LLC
- Hybrid propulsion helicopter including main coaxial counter-rotating rotors and auxiliary tail rotors17 Sep 2026US 2026/0274462 A1
- Double hinged tilting mount for coaxial contra rotating electric propulsion25 Jun 2026US 2026/0175972 A1Lockheed Martin Corporation
- Propulsor external hydraulic control system6 Mar 2025US 2025/0074583 A1Lockheed Martin Corporation
- Helicopter rotor system17 Oct 2024US 2024/0343389 A1Eagle Technologies, LLC
- Coaxial rotor pair assembly with variable collective pitch rotor / propeller for flight vehicle or drone16 May 2024US 2024/0158111 A1Toofon, Inc.
Most cited
By later US patents
- Control for helicopter having dual rigid rotors29US 4,008,979 AUnited Technologies Corporation · 1977
- Aircraft control system and method19US 10,983,534 B2Joby Aero, Inc. · 2021
- Control system and method for rotor assembly14US 8,979,495 B2Sikorsky Aircraft Corporation · 2015
- Analog mixer to vary helicopter rotor phase angle in flight11US 4,027,999 AUnited Technologies Corporation · 1977
- Multi-rotor vehicle with yaw control and autorotation10US 10,315,759 B2California Institute of Technology · 2019