F04C 2/165
Having more than two rotary pistons with parallel axes
Official title: {having more than two rotary pistons with parallel axes}
F04C2/165 (Having more than two rotary pistons with parallel axes) appears on 37 US grants and 39 published applications in this corpus.
Search patents in F04C- Granted patents
- 37
- Published applications
- 39
- Assignees
- 33
- Inventors
- 81
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 4 |
| 2005 | 0 | 0 |
| 2006 | 1 | 2 |
| 2007 | 3 | 2 |
| 2008 | 2 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 2 |
| 2011 | 0 | 0 |
| 2012 | 2 | 1 |
| 2013 | 0 | 3 |
| 2014 | 0 | 2 |
| 2015 | 2 | 3 |
| 2016 | 5 | 0 |
| 2017 | 1 | 0 |
| 2018 | 1 | 2 |
| 2019 | 0 | 3 |
| 2020 | 3 | 1 |
| 2021 | 2 | 1 |
| 2022 | 3 | 2 |
| 2023 | 0 | 0 |
| 2024 | 2 | 7 |
| 2025 | 2 | 1 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Hydraulic screw machine with balance plunger10US 4,242,067 AImo-Industri Aktiebolag · 1980
- Motor driven pump9US 6,499,966 B1Automative Motion Technology, Ltd. · 2002
- Gear pump having input and output screw shafts with a decreasing flight depth toward a gear section in transfer mix areas7US 7,354,188 B2Berstorff GmbH · 2008
- Pump for pumping fluid in a wellbore using a fluid displacer means4US 8,282,365 B2Star Oil Tools Inc. · 2012
- Screw spindle pump having a stop surface axially adjacent to an end surface of a running spindle3US 11,486,392 B2Leistritz Pumpen GmbH · 2022