F04B 9/129
Having plural pumping chambers
Official title: having plural pumping chambers
F04B9/129 (Having plural pumping chambers) appears on 191 US grants and 116 published applications in this corpus.
Search patents in F04B- Granted patents
- 191
- Published applications
- 116
- Assignees
- 113
- Inventors
- 304
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 8 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 6 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 6 | 0 |
| 1995 | 5 | 0 |
| 1996 | 8 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 0 |
| 2002 | 6 | 2 |
| 2003 | 3 | 3 |
| 2004 | 2 | 2 |
| 2005 | 3 | 4 |
| 2006 | 1 | 4 |
| 2007 | 4 | 2 |
| 2008 | 1 | 2 |
| 2009 | 0 | 1 |
| 2010 | 0 | 4 |
| 2011 | 0 | 4 |
| 2012 | 5 | 1 |
| 2013 | 2 | 5 |
| 2014 | 1 | 7 |
| 2015 | 1 | 9 |
| 2016 | 5 | 11 |
| 2017 | 10 | 8 |
| 2018 | 11 | 6 |
| 2019 | 7 | 11 |
| 2020 | 8 | 5 |
| 2021 | 9 | 9 |
| 2022 | 4 | 4 |
| 2023 | 9 | 3 |
| 2024 | 7 | 5 |
| 2025 | 5 | 2 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Pressure multiplier31 Mar 2026US 12,590,593 B2Camozzi Automation S.P.A.
- Method of compressing carbon dioxide using high-pressure electrolysis14 Oct 2025US 12,442,096 B2Hymeth APS
- Compressor and method for compressing a working medium8 Jul 2025US 12,352,263 B2Maximator GmbH
- Industrial pneumatic pump for a viscous fluid3 Jun 2025US 12,320,350 B2Meclube S.R.L.
- Fluid transfer and depressurization system15 Apr 2025US 12,276,277 B2Tpe Midstream LLC
- Compression system18 Jun 2026US 2026/0168483 A1Universite Du Luxembourg
- Displacement Power Controllers and Applications5 Mar 2026US 2026/0063150 A1Perisseuma Technologies LLC
- Hydraulic unit with sequential piston pumps operated by rolling weights23 Oct 2025US 2025/0327444 A1
- Drive system for a positive displacement pump26 Jun 2025US 2025/0207575 A1Graco Minnesota Inc.
- Pressure multiplier18 Jul 2024US 2024/0240652 A1Camozzi Automation S.P.A.
Most cited
By later US patents
- Reciprocating infusion pump and directional adapter set for use therewith80US 4,065,230 AHart Associates, Inc. · 1977
- Fluid driven recipricating apparatus66US 5,616,005 AThe Regents of the University of California · 1997
- Pump apparatus60US 4,008,984 A1977
- Double-acting, fluid-operated pump having pilot valve control of distributor motor55US 4,123,204 AScholle Corporation · 1978
- Double-acting pump54US 6,299,415 B12001