F04B 9/131
With two mechanically connected pumping members
Official title: with two mechanically connected pumping members
F04B9/131 (With two mechanically connected pumping members) appears on 143 US grants and 76 published applications in this corpus.
Search patents in F04B- Granted patents
- 143
- Published applications
- 76
- Assignees
- 78
- Inventors
- 211
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 6 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 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 | 2 | 0 |
| 2001 | 1 | 0 |
| 2002 | 4 | 1 |
| 2003 | 1 | 3 |
| 2004 | 2 | 2 |
| 2005 | 3 | 4 |
| 2006 | 1 | 2 |
| 2007 | 3 | 2 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 0 | 3 |
| 2011 | 0 | 3 |
| 2012 | 2 | 1 |
| 2013 | 2 | 4 |
| 2014 | 1 | 5 |
| 2015 | 1 | 4 |
| 2016 | 4 | 6 |
| 2017 | 4 | 4 |
| 2018 | 7 | 4 |
| 2019 | 6 | 7 |
| 2020 | 4 | 3 |
| 2021 | 8 | 8 |
| 2022 | 2 | 3 |
| 2023 | 7 | 2 |
| 2024 | 5 | 3 |
| 2025 | 3 | 0 |
| 2026 | 1 | 0 |
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.
- 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
- Fluid pump with dual plungers and related systems and methods27 Aug 2024US 12,071,946 B2White Knight Fluid Handling Inc.
- Pressure multiplier18 Jul 2024US 2024/0240652 A1Camozzi Automation S.P.A.
- Fluid transfer and depressurization system18 Apr 2024US 2024/0125311 A1Tpe Midstream LLC
- An industrial pneumatic pump for a viscous fluid1 Feb 2024US 2024/0035459 A1Meclube S.R.L.
- Double-Acting Piston Pump Of Application System23 Nov 2023US 2023/0372963 A1Robatech AG
- Compressor and method for compressing a working medium19 Oct 2023US 2023/0332595 A1Maximator GmbH
Most cited
By later US patents
- 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
- Pump having fluid-actuated motor controlled by fluid-actuated distributor50US 4,104,008 ASchmidt Kranz & Co. · 1978