F04C 28/08
Control of, monitoring of, or safety arrangements for, pumps or pumping installations
Official title: characterised by varying the rotational speed
F04C28/08 (Control of, monitoring of, or safety arrangements for, pumps or pumping installations) appears on 342 US grants and 366 published applications in this corpus.
Search patents in F04C- Granted patents
- 342
- Published applications
- 366
- Assignees
- 175
- Inventors
- 734
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 8 | 0 |
| 1999 | 3 | 0 |
| 2000 | 8 | 0 |
| 2001 | 7 | 8 |
| 2002 | 17 | 17 |
| 2003 | 23 | 17 |
| 2004 | 14 | 13 |
| 2005 | 5 | 13 |
| 2006 | 6 | 12 |
| 2007 | 6 | 9 |
| 2008 | 6 | 15 |
| 2009 | 5 | 11 |
| 2010 | 6 | 9 |
| 2011 | 5 | 11 |
| 2012 | 10 | 7 |
| 2013 | 6 | 13 |
| 2014 | 12 | 14 |
| 2015 | 9 | 11 |
| 2016 | 7 | 11 |
| 2017 | 9 | 20 |
| 2018 | 9 | 23 |
| 2019 | 17 | 15 |
| 2020 | 21 | 23 |
| 2021 | 13 | 29 |
| 2022 | 17 | 14 |
| 2023 | 25 | 20 |
| 2024 | 23 | 9 |
| 2025 | 16 | 12 |
| 2026 | 12 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Reducing power consumption in vacuum pumps1 Oct 2026US 2026/0298240 A1Edwards Limited
- Gas Compressor20 Aug 2026US 2026/0243258 A1Hitachi Industrial Equipment Systems Co., Ltd.
- Air Compressor30 Jul 2026US 2026/0218705 A1Hitachi Industrial Equipment Systems Co., Ltd.
- Systems and methods for operation modes for an air compressor18 Jun 2026US 2026/0168487 A1Doosan Bobcat North America, Inc.
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Most cited
By later US patents
- Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor194US 6,047,557 ACopeland Corporation · 2000
- Capacity modulated scroll machine156US 5,741,120 ACopeland Corporation · 1998
- Torque control apparatus for enclosed compressors114US 4,604,036 AHitachi, Ltd. · 1986
- Frequency converter for different mains voltages105US 7,221,121 B2Danfoss Drives A/S · 2007
- Diagnostic system and method for a cooling system104US 6,679,072 B2Copeland Corporation · 2004