F04B 5/02
Machines or pumps with differential-surface pistons: with double-acting pistons
Official title: with double-acting pistons
F04B5/02 (Machines or pumps with differential-surface pistons: with double-acting pistons) appears on 192 US grants and 184 published applications in this corpus.
Search patents in F04B- Granted patents
- 192
- Published applications
- 184
- Assignees
- 153
- Inventors
- 417
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 5 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 6 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 1 |
| 2003 | 2 | 1 |
| 2004 | 3 | 3 |
| 2005 | 0 | 7 |
| 2006 | 1 | 1 |
| 2007 | 2 | 7 |
| 2008 | 4 | 4 |
| 2009 | 2 | 6 |
| 2010 | 3 | 6 |
| 2011 | 2 | 5 |
| 2012 | 3 | 2 |
| 2013 | 4 | 3 |
| 2014 | 4 | 4 |
| 2015 | 3 | 10 |
| 2016 | 3 | 14 |
| 2017 | 7 | 7 |
| 2018 | 7 | 12 |
| 2019 | 14 | 24 |
| 2020 | 13 | 13 |
| 2021 | 11 | 11 |
| 2022 | 10 | 9 |
| 2023 | 10 | 9 |
| 2024 | 10 | 11 |
| 2025 | 10 | 8 |
| 2026 | 9 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Asymmetric ram piston for intensifier2 Jul 2026US 2026/0185511 A1KMT Waterjet Systems Inc.
- Compression system18 Jun 2026US 2026/0168483 A1Universite Du Luxembourg
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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