F04C 18/30
Rotary-piston pumps specially adapted for elastic fluids: having the characteristics covered by
Official title: having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
F04C18/30 (Rotary-piston pumps specially adapted for elastic fluids: having the characteristics covered by) appears on 1,293 US grants and 1,374 published applications in this corpus.
Search patents in F04C- Granted patents
- 1,293
- Published applications
- 1,374
- Assignees
- 343
- Inventors
- 2,173
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 4 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 9 | 0 |
| 1984 | 12 | 0 |
| 1985 | 12 | 0 |
| 1986 | 16 | 0 |
| 1987 | 7 | 0 |
| 1988 | 12 | 0 |
| 1989 | 11 | 0 |
| 1990 | 8 | 0 |
| 1991 | 12 | 0 |
| 1992 | 11 | 0 |
| 1993 | 9 | 0 |
| 1994 | 10 | 0 |
| 1995 | 6 | 0 |
| 1996 | 17 | 0 |
| 1997 | 12 | 0 |
| 1998 | 11 | 0 |
| 1999 | 9 | 0 |
| 2000 | 10 | 0 |
| 2001 | 19 | 4 |
| 2002 | 16 | 28 |
| 2003 | 29 | 35 |
| 2004 | 24 | 49 |
| 2005 | 31 | 61 |
| 2006 | 33 | 58 |
| 2007 | 30 | 31 |
| 2008 | 19 | 71 |
| 2009 | 41 | 46 |
| 2010 | 36 | 71 |
| 2011 | 30 | 59 |
| 2012 | 40 | 54 |
| 2013 | 39 | 43 |
| 2014 | 45 | 53 |
| 2015 | 51 | 71 |
| 2016 | 38 | 73 |
| 2017 | 50 | 83 |
| 2018 | 71 | 75 |
| 2019 | 56 | 45 |
| 2020 | 52 | 64 |
| 2021 | 40 | 74 |
| 2022 | 81 | 52 |
| 2023 | 50 | 55 |
| 2024 | 71 | 34 |
| 2025 | 53 | 52 |
| 2026 | 28 | 33 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F04C 18/34Having the movement defined in group f04c18/08 or f04c18/22 and relative reciprocation1,177
- F04C 18/32Having both the movement defined in group f04c18/02 and relative reciprocation between173
- F04C 18/40Having the movement defined in group f04c18/08 or f04c18/22 and having a26
- F04C 18/38Having the movement defined in group f04c18/02 and having a hinged member8
- F04C 18/36Having both the movements defined in groups f04c18/22 and f04c18/240
Recent patents
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- Pump8 Oct 2026US 2026/0309152 A1Gebr. Becker GmbH
- Pump body assembly, compressor and air conditioner8 Oct 2026US 2026/0309153 A1Gree Green Refrigeration Technology Center Co., Ltd. of Zhuhai
- Rotary compressor8 Oct 2026US 2026/0309155 A1Fujitsu General Limited
- Pump Body Assembly and Rolling Piston Compressor1 Oct 2026US 2026/0298237 A1Shanghai Highly Electrical Appliances Co., Ltd.
- Compliant bearing housing for compressor systems13 Aug 2026US 2026/0235123 A1
Most cited
By later US patents
- Portable medical suction device381US 4,930,997 A1990
- Rotary compressor with reduced lubrication sensitivity147US 5,947,710 ACarrier Corporation · 1999
- Press-fit structure of a shaft74US 4,886,392 ADiesel Kiki Co., Ltd. · 1989
- Vane type compressor having elliptical stator with doubly-offset rotor52US 4,410,305 AThe Rovac Corporation · 1983
- Two stage gas compressor52US 5,322,424 AMatsushita Electric Industrial Co., Ltd. · 1994