F04C 18/08
Rotary-piston pumps specially adapted for elastic fluids: of intermeshing-engagement type, i.e. with
Official title: of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
F04C18/08 (Rotary-piston pumps specially adapted for elastic fluids: of intermeshing-engagement type, i.e. with) appears on 1,620 US grants and 1,697 published applications in this corpus.
Search patents in F04C- Granted patents
- 1,620
- Published applications
- 1,697
- Assignees
- 549
- Inventors
- 2,491
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 5 | 0 |
| 1978 | 9 | 0 |
| 1979 | 4 | 0 |
| 1980 | 10 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 12 | 0 |
| 1985 | 13 | 0 |
| 1986 | 11 | 0 |
| 1987 | 15 | 0 |
| 1988 | 8 | 0 |
| 1989 | 9 | 0 |
| 1990 | 16 | 0 |
| 1991 | 25 | 0 |
| 1992 | 20 | 0 |
| 1993 | 13 | 0 |
| 1994 | 19 | 0 |
| 1995 | 13 | 0 |
| 1996 | 9 | 0 |
| 1997 | 17 | 0 |
| 1998 | 11 | 0 |
| 1999 | 12 | 0 |
| 2000 | 25 | 0 |
| 2001 | 30 | 12 |
| 2002 | 38 | 37 |
| 2003 | 41 | 41 |
| 2004 | 24 | 56 |
| 2005 | 29 | 50 |
| 2006 | 32 | 45 |
| 2007 | 21 | 43 |
| 2008 | 13 | 79 |
| 2009 | 30 | 61 |
| 2010 | 33 | 72 |
| 2011 | 39 | 43 |
| 2012 | 57 | 58 |
| 2013 | 43 | 53 |
| 2014 | 50 | 57 |
| 2015 | 48 | 84 |
| 2016 | 41 | 85 |
| 2017 | 61 | 95 |
| 2018 | 65 | 95 |
| 2019 | 83 | 100 |
| 2020 | 77 | 97 |
| 2021 | 74 | 96 |
| 2022 | 97 | 79 |
| 2023 | 80 | 76 |
| 2024 | 100 | 72 |
| 2025 | 83 | 65 |
| 2026 | 44 | 46 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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- Compressor and air conditioner8 Sep 2026US 12,729,685 B2Gree Electric Appliances, Inc. of Zhuhai
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- Vacuum pump24 Sep 2026US 2026/0286961 A1Edwards Limited
- Vacuum pump17 Sep 2026US 2026/0275984 A1
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Most cited
By later US patents
- Portable ventilator system278US 7,188,621 B2Pulmonetic Systems, Inc. · 2007
- Two stage screw type vacuum pump with motor in-between the stages140US 5,846,062 AEbara Corporation · 1998
- Compressor system with demand cooling110US 4,974,427 ACopeland Corporation · 1990
- Mechanical ventilation system utilizing bias valve85US 8,118,024 B2CareFusion 203, Inc. · 2012
- Micro-processor control of a movable slide stop and a movable slide valve in a helical screw rotary compressor with an enconomizer inlet port77US 4,609,329 AFrick Company · 1986