F04D 27/008
Stop safety or alarm devices
Official title: {Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves}
F04D27/008 (Stop safety or alarm devices) appears on 287 US grants and 339 published applications in this corpus.
Search patents in F04D- Granted patents
- 287
- Published applications
- 339
- Assignees
- 234
- Inventors
- 731
- Latest grant
- 18 Aug 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 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 2 |
| 2002 | 3 | 6 |
| 2003 | 3 | 5 |
| 2004 | 6 | 12 |
| 2005 | 8 | 14 |
| 2006 | 4 | 8 |
| 2007 | 3 | 11 |
| 2008 | 5 | 11 |
| 2009 | 5 | 6 |
| 2010 | 9 | 7 |
| 2011 | 4 | 6 |
| 2012 | 7 | 11 |
| 2013 | 8 | 14 |
| 2014 | 11 | 16 |
| 2015 | 11 | 18 |
| 2016 | 9 | 12 |
| 2017 | 10 | 13 |
| 2018 | 7 | 15 |
| 2019 | 14 | 21 |
| 2020 | 21 | 18 |
| 2021 | 10 | 29 |
| 2022 | 20 | 14 |
| 2023 | 19 | 26 |
| 2024 | 28 | 11 |
| 2025 | 18 | 11 |
| 2026 | 9 | 22 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Multi-pressure integrated air pump18 Aug 2026US 12,710,032 B2Intex Marketing Ltd.
- Lighting apparatus11 Aug 2026US 12,704,248 B2Leedarson Lighting Co., Ltd.
- Air pump device with automatic air replenishing function and method of using same4 Aug 2026US 12,698,782 B2Wangli Plastic & Electronics (Huizhou) Co., Ltd.
- Variable speed pumping system and method16 Jun 2026US 12,655,848 B2Pentair Water Pool and Spa, Inc.
- Variable speed pumping system and method19 May 2026US 12,631,187 B2Pentair Water Pool and Spa, Inc.
- Portable cooling platform for unmanned autonomous aerial vehicle landing and takeoff, and alignment method thereof8 Oct 2026US 2026/0307831 A1Electronics and Telecommunications Research Institute
- Variable speed pumping system and method8 Oct 2026US 2026/0309157 A1Pentair Water Pool and Spa, Inc.
- Variable speed pumping system and method1 Oct 2026US 2026/0298251 A1Pentair Water Pool and Spa, Inc.
- Method for detecting a deposition layer and associated turbomolecular vacuum pump10 Sep 2026US 2026/0266303 A1Pfeiffer Vacuum GmbH
- Blower30 Jul 2026US 2026/0218717 A1Makita Corporation
Most cited
By later US patents
- Fan with collapsible blades, redundant fan system, and related method271US 6,860,713 B2Nidec Corporation · 2005
- Low profile ceiling fan having a remote control receiver130US 6,015,274 AHunter Fan Company · 2000
- Fan speed monitoring system for determining the speed of a PWM fan97US 5,727,928 ADell USA, L. P. · 1998
- Verification of fan operation77US 6,054,823 ATelCom Semiconductor, Inc. · 2000
- Fan pulse alarm using two stage comparator for speed detection54US 5,889,469 AJMR Electronics, Inc. · 1999