F04C 18/344
With vanes reciprocating with respect to the inner member
Official title: with vanes reciprocating with respect to the inner member
F04C18/344 (With vanes reciprocating with respect to the inner member) appears on 542 US grants and 557 published applications in this corpus.
Search patents in F04C- Granted patents
- 542
- Published applications
- 557
- Assignees
- 252
- Inventors
- 1,042
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 8 | 0 |
| 1984 | 11 | 0 |
| 1985 | 10 | 0 |
| 1986 | 13 | 0 |
| 1987 | 5 | 0 |
| 1988 | 4 | 0 |
| 1989 | 9 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 1 | 0 |
| 1996 | 7 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 5 | 0 |
| 2000 | 7 | 0 |
| 2001 | 9 | 2 |
| 2002 | 4 | 13 |
| 2003 | 14 | 13 |
| 2004 | 8 | 11 |
| 2005 | 13 | 14 |
| 2006 | 4 | 10 |
| 2007 | 5 | 9 |
| 2008 | 1 | 21 |
| 2009 | 9 | 20 |
| 2010 | 6 | 16 |
| 2011 | 9 | 22 |
| 2012 | 14 | 16 |
| 2013 | 16 | 20 |
| 2014 | 10 | 32 |
| 2015 | 23 | 37 |
| 2016 | 21 | 34 |
| 2017 | 27 | 31 |
| 2018 | 27 | 39 |
| 2019 | 17 | 30 |
| 2020 | 23 | 31 |
| 2021 | 24 | 34 |
| 2022 | 38 | 20 |
| 2023 | 28 | 23 |
| 2024 | 25 | 18 |
| 2025 | 24 | 24 |
| 2026 | 14 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F04C 18/3441The inner and outer member being in contact along one line or288
- F04C 18/3446The inner and outer member being in contact along more than one76
- F04C 18/348The vanes positively engaging, with circumferential play, an outer rotatable member30
- F04C 18/3448With axially movable vanes25
- F04C 18/352The vanes being pivoted on the axis of the outer member18
Recent patents
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- Rotor-stator assembly for a rotary engine, compressor or pump, a rotary engine and a lifting unit and device25 Jun 2026US 2026/0176971 A1
- Rotary compressor25 Jun 2026US 2026/0177057 A1Siam Compressor Industry Co., Ltd.
- Rotary compressor and refrigeration cycle apparatus18 Jun 2026US 2026/0168496 A1Carrier Japan Corporation
Most cited
By later US patents
- Portable medical suction device381US 4,930,997 A1990
- 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
- Vane type compressor employing elliptical-circular profile43US 4,299,097 AThe Rovac Corporation · 1981
- Unitary sliding vane compressor-expander and electrical generation system38US 6,589,033 B1Phoenix Analysis and Design Technologies, Inc. · 2003