B64C 11/38
Fluid
Official title: fluid, e.g. hydraulic
B64C11/38 (Fluid) appears on 251 US grants and 256 published applications in this corpus.
Search patents in B64C- Granted patents
- 251
- Published applications
- 256
- Assignees
- 65
- Inventors
- 385
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 7 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 0 |
| 2002 | 1 | 1 |
| 2003 | 2 | 4 |
| 2004 | 2 | 1 |
| 2005 | 2 | 3 |
| 2006 | 3 | 1 |
| 2007 | 2 | 3 |
| 2008 | 0 | 1 |
| 2009 | 0 | 3 |
| 2010 | 1 | 7 |
| 2011 | 3 | 8 |
| 2012 | 4 | 6 |
| 2013 | 5 | 8 |
| 2014 | 8 | 10 |
| 2015 | 7 | 6 |
| 2016 | 8 | 7 |
| 2017 | 8 | 20 |
| 2018 | 8 | 14 |
| 2019 | 19 | 16 |
| 2020 | 21 | 24 |
| 2021 | 21 | 15 |
| 2022 | 17 | 13 |
| 2023 | 12 | 4 |
| 2024 | 15 | 24 |
| 2025 | 25 | 23 |
| 2026 | 10 | 34 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Controlling rate of rotor feather by system secondary to primary blade angle control system14 Jul 2026US 12,679,527 B2Pratt & Whitney Canada Corp.
- Electronically piloted low pitch stop protection14 Jul 2026US 12,680,457 B2Ratier-Figeac SAS
- Hydraulic control circuit for controlling fan blade pitch14 Jul 2026US 12,680,533 B2Safran Aircraft Engines
- Protection for a circuit for controlling the orientation of propeller blades of an aircraft engine7 Jul 2026US 12,674,475 B2Safran Aircraft Engines
- Turboprop erroneous blade angle reading accommodation through minimum torque governing28 Apr 2026US 12,612,153 B2Pratt & Whitney Canada Corp.
- Fan rotor with actuator with locking device24 Sep 2026US 2026/0285475 A1Safran Aircraft Engines
- Oil tank for turbine engine with centrifugal impeller compatible with negative g10 Sep 2026US 2026/0264843 A1Safran Aero Boosters SA
- Fluid system and flying object10 Sep 2026US 2026/0264844 A1Honda Motor Co., Ltd.
- Method and avionics device for controlling the pitch angle of a fan or propeller of an aircraft powertrain27 Aug 2026US 2026/0249980 A1Airbus Operations GmbH
- Method and avionics device for controlling the pitch angle of a fan or propeller of an aircraft powertrain27 Aug 2026US 2026/0250015 A1Airbus Operations GmbH
Most cited
By later US patents
- Blade pitch change control system65US 5,174,718 AUnited Technologies Corporation · 1992
- Electronic propeller control system65US 6,059,528 AUnited Technologies Corporation · 2000
- Counterweighted propeller control system63US 5,897,293 AUnited Technologies Corporation · 1999
- Control system for blades for a variable pitch propeller63US 6,077,040 AUnited Technologies Corporation · 2000
- Blade pitch varying means53US 4,657,484 AGeneral Electric Company · 1987