F04C 28/02
Control of, monitoring of, or safety arrangements for, pumps or pumping installations
Official title: specially adapted for several pumps connected in series or in parallel
F04C28/02 (Control of, monitoring of, or safety arrangements for, pumps or pumping installations) appears on 169 US grants and 181 published applications in this corpus.
Search patents in F04C- Granted patents
- 169
- Published applications
- 181
- Assignees
- 112
- Inventors
- 429
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 2 | 3 |
| 2002 | 8 | 3 |
| 2003 | 7 | 8 |
| 2004 | 3 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 7 |
| 2007 | 0 | 2 |
| 2008 | 4 | 9 |
| 2009 | 0 | 4 |
| 2010 | 4 | 7 |
| 2011 | 1 | 7 |
| 2012 | 7 | 7 |
| 2013 | 4 | 11 |
| 2014 | 3 | 6 |
| 2015 | 4 | 8 |
| 2016 | 6 | 7 |
| 2017 | 9 | 14 |
| 2018 | 4 | 6 |
| 2019 | 10 | 9 |
| 2020 | 10 | 6 |
| 2021 | 6 | 18 |
| 2022 | 12 | 8 |
| 2023 | 11 | 9 |
| 2024 | 9 | 9 |
| 2025 | 9 | 3 |
| 2026 | 7 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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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
- Diagnostic system and method for a cooling system104US 6,679,072 B2Copeland Corporation · 2004
- Method of controlling operation of a plurality of compressors102US 4,580,947 AHitachi, Ltd. · 1986
- Control for refrigeration compressors95US 4,152,902 A1979