B64D 35/06
The propellers or rotors being counter-rotating
Official title: the propellers or rotors being counter-rotating
B64D35/06 (The propellers or rotors being counter-rotating) appears on 136 US grants and 167 published applications in this corpus.
Search patents in B64D- Granted patents
- 136
- Published applications
- 167
- Assignees
- 56
- Inventors
- 222
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 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 | 0 | 0 |
| 2002 | 2 | 1 |
| 2003 | 0 | 3 |
| 2004 | 4 | 1 |
| 2005 | 1 | 2 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 2 |
| 2011 | 0 | 2 |
| 2012 | 1 | 2 |
| 2013 | 0 | 4 |
| 2014 | 6 | 0 |
| 2015 | 4 | 8 |
| 2016 | 1 | 4 |
| 2017 | 6 | 33 |
| 2018 | 8 | 9 |
| 2019 | 9 | 15 |
| 2020 | 16 | 23 |
| 2021 | 24 | 18 |
| 2022 | 15 | 13 |
| 2023 | 10 | 6 |
| 2024 | 16 | 7 |
| 2025 | 5 | 5 |
| 2026 | 3 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for improved rotor assembly for use with a stator11 Aug 2026US 12,703,484 B2MagLev Aero Inc.
- Vertical take-off and landing aircraft17 Mar 2026US 12,576,965 B2Hpg AS
- Manned and unmanned aircraft3 Mar 2026US 12,565,341 B2Dronexus Aero LLC
- Shaft assembly for split torque gear box21 Oct 2025US 12,448,120 B2Lockheed Martin Corporation
- Helicopter rotor system30 Sep 2025US 12,428,142 B2Eagle Technologies, LLC
- Vertical take-off and landing aircraft3 Sep 2026US 2026/0257806 A1
- Aircraft propulsion system with modular open propulsor rotor assembly30 Jul 2026US 2026/0217361 A1Rtx Corporation
- Manned and unmanned aircraft9 Jul 2026US 2026/0192948 A1Dronexus Aero LLC
- 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.
- Systems and methods for vertical takeoff and landing vehicle with improved rotor sizing26 Mar 2026US 2026/0084807 A1MagLev Aero Inc.
Most cited
By later US patents
- VTOL aerodyne with supporting axial blower(s)34US 9,902,493 B2Hutchinson · 2018
- Transmission for driving counter-rotating propellers, lubrication system, and associated methods26US 6,478,641 B22002
- Transmission for a coaxial counter rotating rotor system25US 6,672,538 B2Sikorsky Aircraft Corporation · 2004
- Gearbox arrangement for driving coaxial contra rotating multi-bladed rotors18US 4,964,844 AROLLS-ROYCE plc · 1990
- Remote shaft driven open rotor propulsion system with electrical power generation18US 8,701,381 B2ROLLS-ROYCE plc · 2014