F04D 27/00
Control
Official title: Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
F04D27/00 (Control) appears on 4,333 US grants and 4,671 published applications in this corpus.
Search patents in F04D- Granted patents
- 4,333
- Published applications
- 4,671
- Assignees
- 1,481
- Inventors
- 9,092
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 25 | 0 |
| 1977 | 13 | 0 |
| 1978 | 12 | 0 |
| 1979 | 19 | 0 |
| 1980 | 16 | 0 |
| 1981 | 18 | 0 |
| 1982 | 8 | 0 |
| 1983 | 16 | 0 |
| 1984 | 20 | 0 |
| 1985 | 22 | 0 |
| 1986 | 19 | 0 |
| 1987 | 25 | 0 |
| 1988 | 14 | 0 |
| 1989 | 25 | 0 |
| 1990 | 40 | 0 |
| 1991 | 26 | 0 |
| 1992 | 28 | 0 |
| 1993 | 30 | 0 |
| 1994 | 31 | 0 |
| 1995 | 23 | 0 |
| 1996 | 25 | 0 |
| 1997 | 21 | 0 |
| 1998 | 36 | 0 |
| 1999 | 37 | 0 |
| 2000 | 45 | 0 |
| 2001 | 59 | 12 |
| 2002 | 67 | 70 |
| 2003 | 58 | 75 |
| 2004 | 71 | 84 |
| 2005 | 44 | 99 |
| 2006 | 61 | 81 |
| 2007 | 60 | 106 |
| 2008 | 52 | 113 |
| 2009 | 57 | 124 |
| 2010 | 76 | 139 |
| 2011 | 72 | 129 |
| 2012 | 136 | 165 |
| 2013 | 120 | 211 |
| 2014 | 125 | 221 |
| 2015 | 128 | 248 |
| 2016 | 142 | 271 |
| 2017 | 195 | 332 |
| 2018 | 235 | 304 |
| 2019 | 333 | 271 |
| 2020 | 304 | 299 |
| 2021 | 246 | 290 |
| 2022 | 263 | 222 |
| 2023 | 250 | 238 |
| 2024 | 250 | 187 |
| 2025 | 214 | 220 |
| 2026 | 121 | 160 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F04D 27/02Surge control1,993
- F04D 27/004Control: by varying driving speed1,078
- F04D 27/001Testing thereof939
- F04D 27/008Stop safety or alarm devices287
- F04D 27/002Control: by varying geometry within the pumps266
- F04D 27/009Control: by bleeding, by passing or recycling fluid195
- F04D 27/003Control: by throttling67
- F04D 27/005Control: by changing flow path between different stages or between a plurality65
Recent patents
- Air bleed slots for gas turbine engines6 Oct 2026US 12,753,725 B1Pratt & Whitney Canada Corp.
- 4D printed fan with optimized cooling29 Sep 2026US 12,747,736 B2International Business Machines Corporation
- Blowing device and blowing device operating method29 Sep 2026US 12,747,738 B2Samsung Electronics Co., Ltd.
- Variable vane system for aircraft powerplant29 Sep 2026US 12,747,739 B1Rtx Corporation
- Apparatus and method for measuring RPM of fan by using IR-UWB radar29 Sep 2026US 12,748,186 B2Iucf-Hyu (Industry-University Cooperation Foundation Hanyang University)
- 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 bleed valve assemblies8 Oct 2026US 2026/0309077 A1General Electric Company
- Variable speed pumping system and method8 Oct 2026US 2026/0309157 A1Pentair Water Pool and Spa, Inc.
- Manufacturing automation system, apparatus and method for controlling process environment8 Oct 2026US 2026/0309160 A1Samsung Display Co., Ltd.
- Systems and methods for controlling capacity of a compressor8 Oct 2026US 2026/0309355 A1Tyco Fire & Security GmbH
Most cited
By later US patents
- Compressor stall and surge control using airflow asymmetry measurement414US 5,915,917 AUnited Technologies Corporation · 1999
- Air control system for an air bed273US 5,509,154 ASelect Comfort Corporation · 1996
- Air control system for an air bed273US 6,037,723 ASelect Comfort Corporation · 2000
- Air control system for an air bed272US 6,483,264 B1Select Comfort Corporation · 2002
- Fan with collapsible blades, redundant fan system, and related method271US 6,860,713 B2Nidec Corporation · 2005