B64C 11/306
Specially adapted for contrarotating propellers
Official title: {specially adapted for contrarotating propellers}
B64C11/306 (Specially adapted for contrarotating propellers) appears on 102 US grants and 103 published applications in this corpus.
Search patents in B64C- Granted patents
- 102
- Published applications
- 103
- Assignees
- 32
- Inventors
- 169
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 5 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 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 | 1 |
| 2009 | 0 | 2 |
| 2010 | 0 | 4 |
| 2011 | 1 | 11 |
| 2012 | 5 | 10 |
| 2013 | 2 | 12 |
| 2014 | 9 | 7 |
| 2015 | 10 | 10 |
| 2016 | 8 | 3 |
| 2017 | 8 | 12 |
| 2018 | 8 | 4 |
| 2019 | 7 | 7 |
| 2020 | 9 | 2 |
| 2021 | 5 | 5 |
| 2022 | 3 | 4 |
| 2023 | 4 | 1 |
| 2024 | 1 | 3 |
| 2025 | 2 | 1 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Disengagement for reverse propeller protection26 May 2026US 12,637,202 B2Pratt & Whitney Canada Corp.
- Turbomachine comprising a speed reduction gear integrating an electric machine6 Jan 2026US 12,516,634 B2Safran Transmission Systems
- Rotor system for electrically powered rotorcraft14 Oct 2025US 12,441,464 B1SiFly Aviation, Inc.
- System and a method for controlling rotorcraft rotors14 Jan 2025US 12,197,218 B2Hyper Q Aerospace Holdings Pty Ltd
- Turbomachine with unducted dual propellers21 May 2024US 11,987,369 B2Safran Aircraft Engines
- Disengagement for reverse propeller protection3 Sep 2026US 2026/0257786 A1Pratt & Whitney Canada Corp.
- Aircraft propulsion system with selectively rotatable open propulsor rotor16 Apr 2026US 2026/0104011 A1Rtx Corporation
- Systems and methods for vertical takeoff and landing vehicle with ultra-reliable low latency communications wireless flight control26 Mar 2026US 2026/0084804 A1MagLev Aero Inc.
- Adjusting pitch for airfoils of an aircraft propulsion system5 Mar 2026US 2026/0062117 A1Rtx Corporation
- Disengagement for reverse propeller protection12 Jun 2025US 2025/0187719 A1Pratt & Whitney Canada Corp.
Most cited
By later US patents
- Unducted, counterrotating gearless front fan engine107US 4,976,102 AGeneral Electric Company · 1990
- Counter rotation power turbine80US 5,079,916 AGeneral Electric Company · 1992
- Propeller pitch control system and apparatus55US 4,591,313 AThe Boeing Company · 1986
- Blade pitch varying means53US 4,657,484 AGeneral Electric Company · 1987
- Turbine engine with contra-rotating non-ducted propellers45US 9,017,028 B2Snecma · 2015