F04B 3/00
Machines or pumps with pistons coacting within one cylinder
Official title: Machines or pumps with pistons coacting within one cylinder, e.g. multi-stage
F04B3/00 (Machines or pumps with pistons coacting within one cylinder) appears on 131 US grants and 103 published applications in this corpus.
Search patents in F04B- Granted patents
- 131
- Published applications
- 103
- Assignees
- 88
- Inventors
- 206
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 6 | 0 |
| 1978 | 4 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 6 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 3 |
| 2003 | 3 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 3 |
| 2006 | 0 | 1 |
| 2007 | 1 | 5 |
| 2008 | 2 | 1 |
| 2009 | 1 | 3 |
| 2010 | 1 | 3 |
| 2011 | 0 | 4 |
| 2012 | 2 | 7 |
| 2013 | 2 | 4 |
| 2014 | 2 | 5 |
| 2015 | 5 | 12 |
| 2016 | 3 | 5 |
| 2017 | 3 | 8 |
| 2018 | 8 | 3 |
| 2019 | 7 | 7 |
| 2020 | 6 | 6 |
| 2021 | 1 | 1 |
| 2022 | 5 | 3 |
| 2023 | 3 | 5 |
| 2024 | 3 | 4 |
| 2025 | 7 | 7 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Fluidic methods and devices6 Oct 2026US 12,753,749 B2Obotics Inc.
- Straight axis variable displacement piston pump with rotating swash plate14 Apr 2026US 12,601,333 B2Hamilton Sundstrand Corporation
- Fluid compression apparatus and method17 Feb 2026US 12,553,421 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Reciprocating pump power end with monolithic core27 Jan 2026US 12,535,069 B2Gd Energy Products, LLC
- Fluid compression apparatus and method2 Dec 2025US 12,486,835 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Piston in piston variable displacement hydraulic device30 Jul 2026US 2026/0218690 A1
- Liquefied-gas delivery system23 Jul 2026US 2026/0210499 A1
- Reciprocating pump power end with monolithic core21 May 2026US 2026/0139668 A1Gd Energy Products, LLC
- Systems and Components for Regulating Fluid Infusion to a Patient25 Dec 2025US 2025/0387562 A1Perceptive Medical Inc.
- Straight axis variable displacement piston pump with rotating swash plate25 Dec 2025US 2025/0389259 A1Hamilton Sundstrand Corporation
Most cited
By later US patents
- Multi-mode differential fluid displacement pump69US 4,941,808 A1990
- Method of metering a fluid using a multi-mode differential fluid displacement pump69US 5,366,904 ADRD Diluter Corporation · 1994
- Low power electromagnetic pump46US 4,569,641 AGreatbatch Enterprises, Inc. · 1986
- Low power electromagnetic pump41US 4,636,150 AGreatbatch Enterprises, Inc. · 1987
- Cryogenic pump40US 5,511,955 ACryogenic Group, Inc. · 1996