B64C 27/322
Blade travel limiting devices
Official title: {Blade travel limiting devices, e.g. droop stops}
B64C27/322 (Blade travel limiting devices) appears on 77 US grants and 69 published applications in this corpus.
Search patents in B64C- Granted patents
- 77
- Published applications
- 69
- Assignees
- 27
- Inventors
- 121
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 4 |
| 2008 | 3 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 2 | 1 |
| 2015 | 0 | 4 |
| 2016 | 1 | 1 |
| 2017 | 6 | 32 |
| 2018 | 0 | 2 |
| 2019 | 7 | 8 |
| 2020 | 9 | 3 |
| 2021 | 7 | 3 |
| 2022 | 4 | 1 |
| 2023 | 0 | 3 |
| 2024 | 6 | 1 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Pitch drop friction brake4 Nov 2025US 12,459,638 B2Lockheed Martin Corporation
- Tilt rotor control22 Jul 2025US 12,365,454 B2Goodrich Actuation Systems Limited
- Rotor mount assembly10 Dec 2024US 12,162,593 B2Sz Dji Technology Co., Ltd.
- Chord lock assembly for a tiltrotor aircraft10 Dec 2024US 12,162,594 B2Textron Innovations Inc.
- Pitch angle blocking device13 Aug 2024US 12,060,149 B2Airbus Helicopters Deutschland GmbH
- Pitch drop friction brake20 Mar 2025US 2025/0091712 A1Lockheed Martin Corporation
- Tilt rotor control17 Oct 2024US 2024/0343388 A1Goodrich Actuation Systems Limited
- Multi-rotor aircrafts with passively tiltable rotor groups and methods of making and using the same8 Jun 2023US 2023/0174225 A1this is engineering Inc.
- Teeter flap lock20 Apr 2023US 2023/0118750 A1Bell Textron Inc.
- Chord Lock Assembly for a Tiltrotor Aircraft2 Mar 2023US 2023/0067093 A1Bell Textron Inc.
Most cited
By later US patents
- Compact co-axial rotor system for a rotary wing aircraft and a control system therefor35US 7,210,651 B2Sikorsky Aircraft Corporation · 2007
- Lift fan position lock mechanism35US 9,783,288 B1Kitty Hawk Corporation · 2017
- Helicopter rotor comprising elastomer joints28US 4,369,019 ACostruzioni Aeronautiche Giovanni Agusta S.p.A. · 1983
- Compact co-axial rotor system for a rotary wing aircraft and a control system thereof28US 7,083,142 B2Sikorsky Aircraft Corporation · 2006
- Articulated rotor for helicopters27US 4,342,540 ACostruzioni Aereonautiche Giovanni Agusta S.p.A. · 1982