F04D 27/0292
Stop safety or alarm devices
Official title: {Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves}
F04D27/0292 (Stop safety or alarm devices) appears on 211 US grants and 225 published applications in this corpus.
Search patents in F04D- Granted patents
- 211
- Published applications
- 225
- Assignees
- 128
- Inventors
- 479
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 2 |
| 2002 | 6 | 8 |
| 2003 | 3 | 8 |
| 2004 | 7 | 4 |
| 2005 | 5 | 1 |
| 2006 | 6 | 5 |
| 2007 | 2 | 6 |
| 2008 | 3 | 12 |
| 2009 | 1 | 8 |
| 2010 | 6 | 15 |
| 2011 | 8 | 13 |
| 2012 | 6 | 9 |
| 2013 | 12 | 11 |
| 2014 | 6 | 7 |
| 2015 | 7 | 9 |
| 2016 | 7 | 10 |
| 2017 | 6 | 13 |
| 2018 | 10 | 12 |
| 2019 | 15 | 7 |
| 2020 | 12 | 6 |
| 2021 | 10 | 13 |
| 2022 | 12 | 12 |
| 2023 | 11 | 14 |
| 2024 | 14 | 12 |
| 2025 | 8 | 5 |
| 2026 | 7 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Control device that detects surging30 Jun 2026US 12,669,130 B2Mitsubishi Heavy Industries, Ltd.
- Variable pitch fan of a gas turbine engine14 Apr 2026US 12,601,271 B2General Electric Company
- Compressor7 Apr 2026US 12,595,793 B2Hitachi Industrial Equipment Systems Co., Ltd.
- Surge control systems and methods for dynamic compressors24 Mar 2026US 12,584,489 B2Copeland Corporation
- Free cooling operation of a chiller3 Feb 2026US 12,540,765 B2Tyco Fire & Security GmbH
- Mechanical reverse rotation prevention device for canned motor pump16 Jul 2026US 2026/0201887 A1Hyosung Goodsprings, Inc.
- Computer-controlled power takeoff driven motorized pump system4 Jun 2026US 2026/0153090 A1Lovis, LLC
- Check valve damping8 Jan 2026US 2026/0009478 A1Danfoss A/S
- Magnetic bearing control device, magnetic bearing device, and turbo machine11 Dec 2025US 2025/0377016 A1Daikin Industries, Ltd.
- Impeller containment system24 Jul 2025US 2025/0237154 A1Pratt & Whitney Canada Corp.
Most cited
By later US patents
- Respirator system for use with a hood or face mask265US 4,899,740 AE. D. Bullard Company · 1990
- Electronic control for monitoring status of a compressor111US 4,990,057 AJohnson Service Company · 1991
- Turbo machine with an axial dry gas seal65US 5,412,977 ASulzer-Escher Wyss GmbH · 1995
- Compressor for use in refrigerator37US 5,881,564 AMitsubishi Heavy Industries, Ltd. · 1999
- Active seal assembly34US 7,066,470 B2General Electric Company · 2006