F04B 7/04
In which the valving is performed by pistons and cylinders coacting to
Official title: in which the valving is performed by pistons and cylinders coacting to open and close intake or outlet ports
F04B7/04 (In which the valving is performed by pistons and cylinders coacting to) appears on 280 US grants and 221 published applications in this corpus.
Search patents in F04B- Granted patents
- 280
- Published applications
- 221
- Assignees
- 186
- Inventors
- 513
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 17 | 0 |
| 1978 | 6 | 0 |
| 1979 | 5 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 4 | 0 |
| 1990 | 5 | 0 |
| 1991 | 10 | 0 |
| 1992 | 7 | 0 |
| 1993 | 1 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 7 | 2 |
| 2002 | 5 | 3 |
| 2003 | 5 | 10 |
| 2004 | 8 | 3 |
| 2005 | 2 | 15 |
| 2006 | 2 | 6 |
| 2007 | 3 | 7 |
| 2008 | 2 | 13 |
| 2009 | 2 | 5 |
| 2010 | 6 | 5 |
| 2011 | 2 | 3 |
| 2012 | 8 | 8 |
| 2013 | 6 | 7 |
| 2014 | 2 | 8 |
| 2015 | 6 | 8 |
| 2016 | 8 | 11 |
| 2017 | 9 | 10 |
| 2018 | 6 | 5 |
| 2019 | 10 | 19 |
| 2020 | 9 | 12 |
| 2021 | 19 | 11 |
| 2022 | 10 | 8 |
| 2023 | 6 | 13 |
| 2024 | 11 | 16 |
| 2025 | 15 | 12 |
| 2026 | 6 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Rotating reciprocating piston pump with a barrel cam6 Oct 2026US 12,753,745 B2HTI Technology and Industries, Inc.
- Radial piston pump, method for operating a radial piston pump, and steering system15 Sep 2026US 12,736,036 B2Pump Technology Solutions PS GmbH
- Calibratable variable displacement pump4 Aug 2026US 12,698,767 B2Fluid Metering, Inc.
- Valveless, mechanical, pressure regulating pump14 Jul 2026US 12,680,534 B2Dana Italia S.R.L.
- Mud pump valve leak detection and forecasting30 Jun 2026US 12,669,118 B2Schlumberger Technology Corporation
- Variable displacement pump6 Aug 2026US 2026/0226889 A1Micro Matic USA, Inc.
- A sub-assembly of a pump device25 Dec 2025US 2025/0389261 A1Shl Medical AG
- Reciprocating compressor and fluid injection system25 Dec 2025US 2025/0389263 A1Copeland Corporation
- Reciprocating Compressor And Fluid Injection System25 Dec 2025US 2025/0389264 A1Copeland Corporation
- Reciprocating Compressor And Fluid Injection System25 Dec 2025US 2025/0389265 A1Copeland Corporation
Most cited
By later US patents
- Linear liquid dispensing pump for dispensing liquid in nanoliter volumes124US 5,312,233 AIvek Corporation · 1994
- Apparatus and method for customizing cosmetic products112US 6,510,366 B1Elizabeth Arden Co., Division of Conopco, Inc. · 2003
- Method and apparatus for pressurizing fluids106US 5,879,137 AJetec Company · 1999
- Energy conversion system using windmill91US 4,055,950 A1977
- Fluid pump without non-return valves85US 6,227,824 B1Han-Schickard-Gesellschaft für angewandte Forschung e.V. · 2001