F04C 2/30
Rotary-piston machines or pumps: having the characteristics covered by two or more
Official title: having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
F04C2/30 (Rotary-piston machines or pumps: having the characteristics covered by two or more) appears on 1,013 US grants and 1,055 published applications in this corpus.
Search patents in F04C- Granted patents
- 1,013
- Published applications
- 1,055
- Assignees
- 406
- Inventors
- 1,683
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 5 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 6 | 0 |
| 1982 | 2 | 0 |
| 1983 | 6 | 0 |
| 1984 | 8 | 0 |
| 1985 | 16 | 0 |
| 1986 | 10 | 0 |
| 1987 | 7 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 5 | 0 |
| 1991 | 9 | 0 |
| 1992 | 6 | 0 |
| 1993 | 7 | 0 |
| 1994 | 4 | 0 |
| 1995 | 4 | 0 |
| 1996 | 9 | 0 |
| 1997 | 10 | 0 |
| 1998 | 11 | 0 |
| 1999 | 11 | 0 |
| 2000 | 19 | 0 |
| 2001 | 15 | 7 |
| 2002 | 28 | 17 |
| 2003 | 21 | 18 |
| 2004 | 12 | 20 |
| 2005 | 11 | 29 |
| 2006 | 14 | 21 |
| 2007 | 11 | 24 |
| 2008 | 17 | 41 |
| 2009 | 17 | 51 |
| 2010 | 22 | 38 |
| 2011 | 26 | 29 |
| 2012 | 31 | 37 |
| 2013 | 40 | 61 |
| 2014 | 26 | 55 |
| 2015 | 49 | 90 |
| 2016 | 55 | 76 |
| 2017 | 73 | 79 |
| 2018 | 66 | 79 |
| 2019 | 47 | 43 |
| 2020 | 49 | 58 |
| 2021 | 35 | 44 |
| 2022 | 43 | 48 |
| 2023 | 51 | 32 |
| 2024 | 38 | 24 |
| 2025 | 26 | 22 |
| 2026 | 13 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F04C 2/34Having the movement defined in groups f04c2/08 or f04c2/22 and relative reciprocation930
- F04C 2/32Having both the movement defined in groups f04c2/02 and relative reciprocation between64
- F04C 2/40Having the movement defined in group f04c2/08 or f04c2/22 and having a50
- F04C 2/36Having both the movements defined in groups f04c2/22 and f04c2/246
- F04C 2/38Having the movement defined in group f04c2/02 and having a hinged member2
Recent patents
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Most cited
By later US patents
- Auto suction hybrid pump99US 7,014,417 B2Horn GmbH & Co. KG · 2006
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- Reverse osmosis with free rotor booster pump74US 4,973,408 A1990
- Pump with conveying chamber formed in outer rotor surface55US 7,674,100 B2PDD Innovations Ltd. · 2010
- Rotary pump having a hydraulic intermediate capacity with first and second connections48US 6,817,847 B2LuK Fahrzeug-Hydraulik GmbH & Co.KG · 2004