F01D 21/20
Checking operation of shut-down devices
F01D21/20 (Checking operation of shut-down devices) appears on 49 US grants and 40 published applications in this corpus.
Search patents in F01D- Granted patents
- 49
- Published applications
- 40
- Assignees
- 34
- Inventors
- 131
- Latest grant
- 5 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 3 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 1 | 3 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 1 | 3 |
| 2012 | 1 | 4 |
| 2013 | 1 | 1 |
| 2014 | 4 | 2 |
| 2015 | 1 | 0 |
| 2016 | 2 | 2 |
| 2017 | 0 | 4 |
| 2018 | 2 | 4 |
| 2019 | 2 | 0 |
| 2020 | 3 | 2 |
| 2021 | 0 | 2 |
| 2022 | 0 | 6 |
| 2023 | 3 | 2 |
| 2024 | 3 | 1 |
| 2025 | 2 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- In-flight hybrid electric engine shutdown5 May 2026US 12,618,335 B2General Electric Company
- System and method for mitigating bowed rotor in a gas turbine engine25 Nov 2025US 12,480,423 B2General Electric Company
- Flammable fluid reservoir11 Feb 2025US 12,221,927 B2Pratt & Whitney Canada Corp.
- Plant monitoring device, method and program using a corrected Mahalanobis distance to determine plant abnormality24 Dec 2024US 12,174,623 B2Mitsubishi Heavy Industries, Ltd.
- Ice detection and precautionary system shut-down event reduction systems and related methods1 Oct 2024US 12,103,690 B2The United States of America as represented by the Secretary of the Air Force
- Ice Detection and Precautionary System Shut-Down Event Reduction Systems and Related Methods19 Mar 2026US 2026/0077867 A1Government of the United States as Represented by the Secretary of the Air Force
- Flammable fluid reservoir24 Oct 2024US 2024/0352893 A1Pratt & Whitney Canada Corp.
- Cooling system for power cables in a gas turbine engine12 Oct 2023US 2023/0323781 A1Raytheon Technologies Corporation
- System and method for use with gas turbine engine28 Sep 2023US 2023/0304446 A1ROLLS-ROYCE plc
- Plant monitoring device, plant monitoring method, and program3 Nov 2022US 2022/0350320 A1Mitsubishi Power, Ltd.
Most cited
By later US patents
- Method of diagnostic valve testing55US 4,274,438 AWestinghouse Electric Corp. · 1981
- Method and apparatus for detecting rub in a turbomachine46US 7,409,319 B2General Electric Company · 2008
- Pressure medium actuated valve16US 4,552,330 ASulzer Brothers Limited · 1985
- Method and apparatus for testing the movability of valve plugs14US 4,059,960 AWestinghouse Electric Corp. · 1977
- Turbine trip circuit12US 4,217,617 AGeneral Electric Company · 1980