F04B 1/063
By using a valve in a system with several pumping chambers wherein
Official title: by using a valve in a system with several pumping chambers wherein the flow-path through the chambers can be changed, e.g. between series and parallel flow
F04B1/063 (By using a valve in a system with several pumping chambers wherein) appears on 34 US grants and 33 published applications in this corpus.
Search patents in F04B- Granted patents
- 34
- Published applications
- 33
- Assignees
- 24
- Inventors
- 60
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 2 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 1 | 2 |
| 2015 | 0 | 0 |
| 2016 | 1 | 1 |
| 2017 | 2 | 7 |
| 2018 | 3 | 0 |
| 2019 | 1 | 2 |
| 2020 | 2 | 3 |
| 2021 | 2 | 2 |
| 2022 | 3 | 4 |
| 2023 | 3 | 1 |
| 2024 | 0 | 2 |
| 2025 | 3 | 3 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Radial piston pump109US 5,032,065 ANissan Motor Co., Ltd. · 1991
- Radial piston pump assemblies and use thereof in hydraulic circuits95US 10,125,750 B2HUSCO International, Inc. · 2018
- Digital controlled fluid translating device23US 6,681,571 B2Caterpillar Inc. · 2004
- Piston machine with changeable displacement14US 4,807,519 AMannesmann Rexroth GmbH · 1989
- Fluid translating device14US 6,651,545 B2Caterpillar Inc. · 2003