F04B 19/003
Free-piston type pumps
Official title: {free-piston type pumps}
F04B19/003 (Free-piston type pumps) appears on 48 US grants and 44 published applications in this corpus.
Search patents in F04B- Granted patents
- 48
- Published applications
- 44
- Assignees
- 44
- Inventors
- 111
- Latest grant
- 10 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 1 |
| 2003 | 4 | 2 |
| 2004 | 0 | 1 |
| 2005 | 2 | 1 |
| 2006 | 1 | 2 |
| 2007 | 0 | 1 |
| 2008 | 0 | 2 |
| 2009 | 0 | 1 |
| 2010 | 1 | 4 |
| 2011 | 0 | 0 |
| 2012 | 3 | 4 |
| 2013 | 3 | 1 |
| 2014 | 0 | 3 |
| 2015 | 2 | 2 |
| 2016 | 0 | 1 |
| 2017 | 0 | 3 |
| 2018 | 1 | 3 |
| 2019 | 5 | 2 |
| 2020 | 2 | 1 |
| 2021 | 1 | 1 |
| 2022 | 2 | 3 |
| 2023 | 2 | 1 |
| 2024 | 0 | 3 |
| 2025 | 1 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Cylinder in particular for hydrogen tank cycling facility10 Feb 2026US 12,546,296 B2Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Hydraulic pumping system29 Jul 2025US 12,372,080 B2
- Plasma compression driver25 Jul 2023US 11,711,884 B2General Fusion Inc.
- Hydraulic pumping system21 Mar 2023US 11,608,824 B2
- Active control valve for a fluid pump1 Nov 2022US 11,486,386 B2Cummins Inc.
- Method for operating a linear motor compressor, and linear motor compressor13 Aug 2026US 2026/0235117 A1Burckhardt Compression AG
- Cylinder in particular for hydrogen tank cycling facility3 Oct 2024US 2024/0328439 A1Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Hydrogen tank cycling facility3 Oct 2024US 2024/0328916 A1Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Hydraulic pumping system8 Feb 2024US 2024/0044326 A1
- Plasma compression driver5 Jan 2023US 2023/0003205 A1General Fusion Inc.
Most cited
By later US patents
- Rotating subsea diverter162US 6,230,824 B1Hydril Company · 2001
- Offshore drilling system154US 6,325,159 B1Hydril Company · 2001
- Subsea mud pump with reduced pulsation145US 6,102,673 AHydril Company · 2000
- Subsea mud pump and control system84US 6,505,691 B2Hydril Company · 2003
- High pressure liquid pump apparatus and pumping method62US 5,322,418 AThe Toro Company · 1994