F04C 28/24
Control of, monitoring of, or safety arrangements for, pumps or pumping installations
Official title: characterised by using valves controlling pressure or flow rate, e.g. discharge valves {or unloading valves}(F04C28/10 takes precedence)
F04C28/24 (Control of, monitoring of, or safety arrangements for, pumps or pumping installations) appears on 662 US grants and 595 published applications in this corpus.
Search patents in F04C- Granted patents
- 662
- Published applications
- 595
- Assignees
- 235
- Inventors
- 1,213
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 5 | 0 |
| 1983 | 9 | 0 |
| 1984 | 4 | 0 |
| 1985 | 8 | 0 |
| 1986 | 3 | 0 |
| 1987 | 8 | 0 |
| 1988 | 4 | 0 |
| 1989 | 7 | 0 |
| 1990 | 3 | 0 |
| 1991 | 7 | 0 |
| 1992 | 5 | 0 |
| 1993 | 6 | 0 |
| 1994 | 12 | 0 |
| 1995 | 6 | 0 |
| 1996 | 7 | 0 |
| 1997 | 9 | 0 |
| 1998 | 12 | 0 |
| 1999 | 7 | 0 |
| 2000 | 15 | 0 |
| 2001 | 11 | 4 |
| 2002 | 18 | 12 |
| 2003 | 15 | 20 |
| 2004 | 15 | 18 |
| 2005 | 10 | 18 |
| 2006 | 9 | 15 |
| 2007 | 11 | 15 |
| 2008 | 9 | 17 |
| 2009 | 7 | 21 |
| 2010 | 5 | 17 |
| 2011 | 19 | 23 |
| 2012 | 16 | 17 |
| 2013 | 21 | 22 |
| 2014 | 18 | 23 |
| 2015 | 23 | 25 |
| 2016 | 18 | 26 |
| 2017 | 23 | 36 |
| 2018 | 27 | 37 |
| 2019 | 24 | 25 |
| 2020 | 33 | 33 |
| 2021 | 28 | 35 |
| 2022 | 34 | 33 |
| 2023 | 37 | 26 |
| 2024 | 47 | 29 |
| 2025 | 27 | 24 |
| 2026 | 7 | 24 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Pressure control valve6 Oct 2026US 12,753,762 B2Eagle Industry Co., Ltd.
- Method for controlling a compressor installation4 Aug 2026US 12,698,766 B2Kaeser Kompressoren SE
- Fixed scroll assembly and scroll compressor7 Jul 2026US 12,674,458 B2Copeland Climate Technologies (Suzhou) Co. Ltd.
- Electric compressor with passive pressure system between high and low pressure regions9 Jun 2026US 12,650,126 B2Mahle International GmbH
- Supercharged internal combustion engine with intake port timing shutters controlling the air mass flowing into the supercharger31 Mar 2026US 12,590,584 B2
- Scroll compressor1 Oct 2026US 2026/0298232 A1BITZER Refrigeration Technology (China) Co., Ltd.
- Reversible Fluid Pump with Pressure Relief Mechanism17 Sep 2026US 2026/0275986 A1Illinois Tool Works Inc.
- Operation control method for engine driven compressor and engine driven compressor27 Aug 2026US 2026/0251144 A1Airman Corporation
- Gas Compressor20 Aug 2026US 2026/0243258 A1Hitachi Industrial Equipment Systems Co., Ltd.
- Gas Compressor20 Aug 2026US 2026/0243261 A1Hitachi Industrial Equipment Systems Co., Ltd.
Most cited
By later US patents
- Scroll-type machine with axially compliant mounting226US 4,877,382 ACopeland Corporation · 1989
- Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor194US 6,047,557 ACopeland Corporation · 2000
- Compressor pulse width modulation172US 6,213,731 B1Copeland Corporation · 2001
- Capacity modulated scroll machine162US 5,613,841 ACopeland Corporation · 1997
- Capacity modulated scroll machine156US 5,741,120 ACopeland Corporation · 1998