F04C 18/3441
The inner and outer member being in contact along one line or
Official title: {the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation}
F04C18/3441 (The inner and outer member being in contact along one line or) appears on 288 US grants and 292 published applications in this corpus.
Search patents in F04C- Granted patents
- 288
- Published applications
- 292
- Assignees
- 156
- Inventors
- 553
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 7 | 0 |
| 1984 | 6 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 5 | 0 |
| 1997 | 0 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 4 | 0 |
| 2001 | 7 | 1 |
| 2002 | 4 | 7 |
| 2003 | 8 | 8 |
| 2004 | 5 | 6 |
| 2005 | 7 | 7 |
| 2006 | 1 | 9 |
| 2007 | 2 | 6 |
| 2008 | 1 | 18 |
| 2009 | 9 | 15 |
| 2010 | 6 | 13 |
| 2011 | 7 | 20 |
| 2012 | 11 | 9 |
| 2013 | 13 | 9 |
| 2014 | 7 | 16 |
| 2015 | 14 | 14 |
| 2016 | 13 | 14 |
| 2017 | 16 | 16 |
| 2018 | 8 | 15 |
| 2019 | 5 | 16 |
| 2020 | 10 | 11 |
| 2021 | 12 | 17 |
| 2022 | 22 | 7 |
| 2023 | 7 | 12 |
| 2024 | 16 | 8 |
| 2025 | 7 | 8 |
| 2026 | 9 | 10 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Rotary compressor for rapid freezing appliances9 Jun 2026US 12,650,128 B2Rechi Precision Co., Ltd.
- Vacuum pump with oil drip shutoff2 Jun 2026US 12,644,453 B2
- Sliding vane rotary pump21 Apr 2026US 12,607,187 B2Busch Produktions GmbH
- Moving wall multiphase compressor-pump-expander system21 Apr 2026US 12,607,188 B1
- Pump with a modular construction21 Apr 2026US 12,607,190 B2Vitesco Technologies Germany GmbH
- Pump8 Oct 2026US 2026/0309152 A1Gebr. Becker GmbH
- 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
- Rotary compressor for rapid freezing appliances4 Jun 2026US 2026/0153088 A1Rechi Precision Co., Ltd.
Most cited
By later US patents
- Portable medical suction device381US 4,930,997 A1990
- 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
- Capacity control of refrigeration systems37US 6,385,981 B1Mobile Climate Control Industries, Inc. · 2002
- Sliding-blade vapor engine with vortex boiler33US 5,758,501 A1998