F04B 5/00
Machines or pumps with differential-surface pistons
F04B5/00 (Machines or pumps with differential-surface pistons) appears on 250 US grants and 220 published applications in this corpus.
Search patents in F04B- Granted patents
- 250
- Published applications
- 220
- Assignees
- 183
- Inventors
- 509
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 4 | 0 |
| 1978 | 8 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 4 | 0 |
| 1992 | 2 | 0 |
| 1993 | 8 | 0 |
| 1994 | 3 | 0 |
| 1995 | 4 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 9 | 0 |
| 2001 | 4 | 0 |
| 2002 | 3 | 1 |
| 2003 | 3 | 2 |
| 2004 | 3 | 4 |
| 2005 | 1 | 8 |
| 2006 | 2 | 3 |
| 2007 | 3 | 8 |
| 2008 | 4 | 6 |
| 2009 | 4 | 8 |
| 2010 | 4 | 11 |
| 2011 | 6 | 6 |
| 2012 | 5 | 2 |
| 2013 | 6 | 4 |
| 2014 | 4 | 6 |
| 2015 | 3 | 13 |
| 2016 | 4 | 16 |
| 2017 | 7 | 10 |
| 2018 | 9 | 12 |
| 2019 | 16 | 24 |
| 2020 | 14 | 15 |
| 2021 | 11 | 12 |
| 2022 | 11 | 10 |
| 2023 | 10 | 9 |
| 2024 | 10 | 12 |
| 2025 | 12 | 10 |
| 2026 | 10 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods for reducing wear in a reciprocating piston pump11 Aug 2026US 12,704,135 B2Spotton Corp.
- Piston compressor and method of operating the same23 Jun 2026US 12,662,995 B2Burckhardt Compression AG
- Positive displacement pump2 Jun 2026US 12,644,440 B2Binks US, LLC
- Hydraulic piston pump assemblies5 May 2026US 12,618,399 B2Roadtek Enterprises Inc.
- Sealing gas leakage recovery and sealing gas boosting system and method28 Apr 2026US 12,612,922 B2Nuovo Pignone Tecnologie Srl
- Improved pressure adapter for hydraulic system8 Oct 2026US 2026/0309122 A1Poclain Hydraulics Industrie
- Improved multi-cylinder hydraulic machine8 Oct 2026US 2026/0309134 A1Poclain Hydraulics Industrie
- Near-isothermal gas compressor and/or /expander system30 Jul 2026US 2026/0218693 A1University of Virginia Patent Foundation
- Liquefied-gas delivery system23 Jul 2026US 2026/0210499 A1
- Asymmetric ram piston for intensifier2 Jul 2026US 2026/0185511 A1KMT Waterjet Systems Inc.
Most cited
By later US patents
- Reverse osmosis method and apparatus88US 4,187,173 A1980
- Rotary shaft driven reverse osmosis method and apparatus83US 4,288,326 A1981
- Wave energy converter67US 6,812,588 B12004
- Steam mop62US 8,205,293 B2Euro-Pro Operating LLC · 2012
- Apparatus for the simultaneous filling of precise amounts of viscous liquid material in a sanitary environment61US 7,108,024 B2Cott Technologies, Inc. · 2006