F04B 25/04
Multi-stage pumps: having cylinders coaxial with, or parallel or inclined to, main
Official title: having cylinders coaxial with, or parallel or inclined to, main shaft axis
F04B25/04 (Multi-stage pumps: having cylinders coaxial with, or parallel or inclined to, main) appears on 39 US grants and 36 published applications in this corpus.
Search patents in F04B- Granted patents
- 39
- Published applications
- 36
- Assignees
- 34
- Inventors
- 65
- Latest grant
- 26 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 1 | 1 |
| 2013 | 0 | 1 |
| 2014 | 1 | 2 |
| 2015 | 1 | 4 |
| 2016 | 1 | 4 |
| 2017 | 4 | 2 |
| 2018 | 4 | 3 |
| 2019 | 3 | 5 |
| 2020 | 4 | 1 |
| 2021 | 3 | 3 |
| 2022 | 2 | 1 |
| 2023 | 1 | 1 |
| 2024 | 1 | 1 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Economizer injection in a reciprocating compressor26 Aug 2025US 12,398,926 B2Carrier Corporation
- Refrigerant compressor with stator elastic support19 Nov 2024US 12,146,486 B2BITZER Kuehlmaschinenbau GmbH
- Variable stroke pump27 Jun 2023US 11,686,295 B2Cw Holdings Ltd
- Multi-stage compressor and method of controlling the same7 Jun 2022US 11,353,013 B2Hyundai Motor Company
- Apparatus for reducing suction pulsation and swash plate type compressor comprising same5 Apr 2022US 11,293,421 B2Hanon Systems
- Economizer injection in a reciprocating compressor13 Nov 2025US 2025/0347446 A1Carrier Corporation
- Refrigerant compressor12 Dec 2024US 2024/0410360 A1BITZER Kuehlmaschinenbau GmbH
- Economizer injection in a reciprocating compressor9 Feb 2023US 2023/0041180 A1Carrier Corporation
- Variable stroke pump20 Jan 2022US 2022/0018339 A1Cw Holdings Ltd
- Refrigerant compresssor30 Dec 2021US 2021/0404457 A1BITZER Kuehlmaschinenbau GmbH
Most cited
By later US patents
- Four-stage gas compressor30US 4,334,833 A1982
- Two-stage rotary compressor27US 4,553,903 A1985
- Two-stage rotary compressor25US 4,460,319 A1984
- Fluid pressure intensifier device23US 4,714,411 ANormalair-Garrett (Holdings) Limited · 1987
- Multistage swash plate compressor having two different sets of cylinders in the same housing17US 5,931,645 AKabushiki Kaisha Jidoshokki Seisakusho · 1999