F04C 23/00
Combinations of two or more pumps, each being of rotary-piston or oscillating-piston
Official title: Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids (F04C25/00 takes precedence)
F04C23/00 (Combinations of two or more pumps, each being of rotary-piston or oscillating-piston) appears on 3,315 US grants and 3,455 published applications in this corpus.
Search patents in F04C- Granted patents
- 3,315
- Published applications
- 3,455
- Assignees
- 580
- Inventors
- 4,707
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 3 | 0 |
| 1978 | 7 | 0 |
| 1979 | 1 | 0 |
| 1980 | 10 | 0 |
| 1981 | 8 | 0 |
| 1982 | 3 | 0 |
| 1983 | 9 | 0 |
| 1984 | 12 | 0 |
| 1985 | 18 | 0 |
| 1986 | 9 | 0 |
| 1987 | 24 | 0 |
| 1988 | 20 | 0 |
| 1989 | 22 | 0 |
| 1990 | 28 | 0 |
| 1991 | 36 | 0 |
| 1992 | 35 | 0 |
| 1993 | 36 | 0 |
| 1994 | 35 | 0 |
| 1995 | 36 | 0 |
| 1996 | 46 | 0 |
| 1997 | 32 | 0 |
| 1998 | 43 | 0 |
| 1999 | 31 | 0 |
| 2000 | 54 | 0 |
| 2001 | 66 | 16 |
| 2002 | 92 | 105 |
| 2003 | 99 | 105 |
| 2004 | 78 | 134 |
| 2005 | 50 | 113 |
| 2006 | 82 | 146 |
| 2007 | 70 | 83 |
| 2008 | 56 | 137 |
| 2009 | 77 | 142 |
| 2010 | 83 | 154 |
| 2011 | 74 | 134 |
| 2012 | 122 | 120 |
| 2013 | 91 | 145 |
| 2014 | 96 | 139 |
| 2015 | 124 | 155 |
| 2016 | 114 | 146 |
| 2017 | 124 | 150 |
| 2018 | 135 | 156 |
| 2019 | 135 | 138 |
| 2020 | 121 | 182 |
| 2021 | 139 | 140 |
| 2022 | 173 | 155 |
| 2023 | 152 | 152 |
| 2024 | 196 | 134 |
| 2025 | 136 | 154 |
| 2026 | 69 | 120 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F04C 23/008Hermetic pumps2,491
- F04C 23/001Combinations of two or more pumps, each being of rotary-piston or oscillating-piston830
- F04C 23/02Pumps characterised by combination with, or adaptation to, specific driving engines or206
- F04C 23/005Combinations of two or more pumps, each being of rotary-piston or oscillating-piston176
Recent patents
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- Method for controlling a compressor installation4 Aug 2026US 12,698,766 B2Kaeser Kompressoren SE
- Systems and methods for mobile compression8 Oct 2026US 2026/0309154 A1Artemis Production Solutions, Inc.
- Rotary compressor8 Oct 2026US 2026/0309155 A1Fujitsu General Limited
- Scroll compressor1 Oct 2026US 2026/0298234 A1Ishikawa Energy Research Co., Ltd.
- Motorized device comprising a member with eccentric movement1 Oct 2026US 2026/0298242 A1Sonceboz Motion Boncourt SA
- Compressor, method for manufacturing compressor, and method for evaluating coating material for compressor17 Sep 2026US 2026/0275985 A1Carrier Japan Corporation
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 diagnostic system172US 6,615,594 B2Copeland Corporation · 2003
- Capacity modulated scroll machine162US 5,613,841 ACopeland Corporation · 1997
- Capacity modulated scroll machine156US 5,741,120 ACopeland Corporation · 1998