F02C 9/38
Characterised by throttling and returning of fuel to sump
Official title: characterised by throttling and returning of fuel to sump
F02C9/38 (Characterised by throttling and returning of fuel to sump) appears on 65 US grants and 41 published applications in this corpus.
Search patents in F02C- Granted patents
- 65
- Published applications
- 41
- Assignees
- 34
- Inventors
- 130
- Latest grant
- 18 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 4 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 0 |
| 2003 | 3 | 4 |
| 2004 | 2 | 2 |
| 2005 | 2 | 2 |
| 2006 | 3 | 0 |
| 2007 | 0 | 2 |
| 2008 | 0 | 0 |
| 2009 | 2 | 0 |
| 2010 | 0 | 5 |
| 2011 | 0 | 0 |
| 2012 | 0 | 2 |
| 2013 | 2 | 2 |
| 2014 | 1 | 1 |
| 2015 | 2 | 0 |
| 2016 | 0 | 2 |
| 2017 | 3 | 0 |
| 2018 | 1 | 1 |
| 2019 | 1 | 3 |
| 2020 | 0 | 2 |
| 2021 | 4 | 2 |
| 2022 | 3 | 4 |
| 2023 | 2 | 2 |
| 2024 | 4 | 3 |
| 2025 | 3 | 0 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Start pump and generator18 Nov 2025US 12,473,865 B1Hamilton Sundstrand Corporation
- Gas turbine engine with controlled return of fuel to power accessories and retrofitting method29 Jul 2025US 12,372,032 B1Rtx Corporation
- Excess fuel flow to drive turbine15 Jul 2025US 12,359,625 B2Rtx Corporation
- Gas turbine engine heat exchange3 Dec 2024US 12,158,115 B2ROLLS-ROYCE plc
- Variable displacement pumps27 Aug 2024US 12,071,942 B2Hamilton Sundstrand Corporation
- Systems and methods for operating an aircraft engine using multiple fuel types30 Apr 2026US 2026/0117714 A1Pratt & Whitney Canada Corp.
- Gas turbine engine with controlled return of fuel to power accessories and retrofitting method5 Feb 2026US 2026/0036092 A1Rtx Corporation
- Gas turbine engine heat exchange19 Sep 2024US 2024/0309817 A1ROLLS-ROYCE plc
- Gas turbine engine heat exchange27 Jun 2024US 2024/0209799 A1ROLLS-ROYCE plc
- Systems and methods for purging a fuel manifold of a gas turbine engine9 May 2024US 2024/0151183 A1Pratt & Whitney Canada Corp.
Most cited
By later US patents
- Valve apparatus for providing shutoff and overspeed protection in a gas turbine fuel system50US 6,401,446 B1Hamilton Sundstrand Corporation · 2002
- Hydromechanical control for a variable delivery, positive displacement fuel pump46US 5,715,674 AUnited Technologies Corporation · 1998
- Efficiency fluid pumping system including sequential unloading of a plurality of pumps by a single pressure responsive control valve38US 4,245,964 AUnited Technologies Corporation · 1981
- Dual stepper motor actuator for fuel metering valve34US 4,608,820 AChandler Evans Inc. · 1986
- Simplified fuel control for use with a positive displacement pump28US 6,666,015 B2Hamilton Sundstrand Corporation · 2003