F01D 1/24
Non-positive-displacement machines or engines: characterised by counter-rotating rotors subjected to same working
Official title: characterised by counter-rotating rotors subjected to same working fluid stream without intermediate stator blades or the like
F01D1/24 (Non-positive-displacement machines or engines: characterised by counter-rotating rotors subjected to same working) appears on 173 US grants and 178 published applications in this corpus.
Search patents in F01D- Granted patents
- 173
- Published applications
- 178
- Assignees
- 50
- Inventors
- 243
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 3 | 3 |
| 2005 | 0 | 1 |
| 2006 | 1 | 8 |
| 2007 | 5 | 3 |
| 2008 | 4 | 4 |
| 2009 | 3 | 3 |
| 2010 | 1 | 7 |
| 2011 | 1 | 2 |
| 2012 | 2 | 4 |
| 2013 | 5 | 18 |
| 2014 | 5 | 8 |
| 2015 | 12 | 7 |
| 2016 | 7 | 8 |
| 2017 | 8 | 3 |
| 2018 | 5 | 17 |
| 2019 | 10 | 18 |
| 2020 | 18 | 12 |
| 2021 | 13 | 13 |
| 2022 | 16 | 11 |
| 2023 | 15 | 10 |
| 2024 | 13 | 8 |
| 2025 | 8 | 1 |
| 2026 | 2 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fuel vaporization power turbine engine, method of assembly and method of use14 Jul 2026US 12,680,453 B1General Electric Company
- Control system for open rotor propulsion system with one or more sensors9 Jun 2026US 12,650,085 B1Rtx Corporation
- Ram air turbine23 Dec 2025US 12,503,249 B2ESS 2 Tech, LLC
- Architecture of a turbomachine with counter-rotating turbine23 Dec 2025US 12,503,976 B2Safran Aircraft Engines
- Gas turbine for twin-rotor aircraft2 Dec 2025US 12,486,818 B2Safran Aircraft Engines
- Aeronautical propulsion system13 Aug 2026US 2026/0233847 A1Safran Aircraft Engines
- Aeronautical propulsion system13 Aug 2026US 2026/0240026 A1Safran Aircraft Engines
- Control system for open rotor propulsion system with one or more sensors11 Jun 2026US 2026/0160179 A1Rtx Corporation
- Lubricant system21 May 2026US 2026/0139610 A1Pratt & Whitney Canada Corp.
- Ram air turbine26 Mar 2026US 2026/0084829 A1ESS 2 Tech, LLC
Most cited
By later US patents
- Aircraft gas turbine engine having variable torque split counter rotating low pressure turbines and booster aft of counter rotating fans115US 6,763,654 B2General Electric Company · 2004
- Turbojet with contrarotating wheels108US 4,463,553 AOffice National D’Etudes Et De Recherches AéRospatiales · 1984
- Jet assisted counter rotating wind turbine98US 6,127,739 A2000
- Counter-rotating turbine engine including a gearbox91US 7,451,592 B2ROLLS-ROYCE plc · 2008
- Counter-rotating gas turbine engine and method of assembling same73US 7,334,392 B2General Electric Company · 2008