F01C 20/18
Control of, monitoring of, or safety arrangements for, machines or engines: characterised
Official title: characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F01C20/10)
F01C20/18 (Control of, monitoring of, or safety arrangements for, machines or engines: characterised) appears on 59 US grants and 32 published applications in this corpus.
Search patents in F01C- Granted patents
- 59
- Published applications
- 32
- Assignees
- 30
- Inventors
- 97
- Latest grant
- 3 Sep 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 2 |
| 2005 | 1 | 1 |
| 2006 | 1 | 2 |
| 2007 | 3 | 2 |
| 2008 | 1 | 1 |
| 2009 | 0 | 0 |
| 2010 | 3 | 2 |
| 2011 | 0 | 1 |
| 2012 | 1 | 2 |
| 2013 | 0 | 2 |
| 2014 | 0 | 1 |
| 2015 | 2 | 2 |
| 2016 | 1 | 4 |
| 2017 | 2 | 0 |
| 2018 | 3 | 2 |
| 2019 | 1 | 2 |
| 2020 | 1 | 2 |
| 2021 | 2 | 1 |
| 2022 | 1 | 0 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Displacement power controllers and applications3 Sep 2024US 12,078,193 B2Perisseuma Technologies LLC
- Shifting head assisted rotary positive displacement device14 Nov 2023US 11,814,961 B2
- Rotary internal combustion engine with unequal volumetric ratios1 Mar 2022US 11,261,781 B2Pratt & Whitney Canada Corp.
- Control device to achieve variable compression ratio for triangle rotary engine4 May 2021US 10,995,618 B2Jiangsu University
- Fluid machinery, heat exchange equipment, and operating method for fluid machinery9 Mar 2021US 10,941,771 B2Gree Green Refrigeration Technology Center Co., Ltd. of Zhuhai
- Displacement Power Controllers and Applications23 Nov 2023US 2023/0375011 A1Perisseuma Technologies LLC
- Shifting Head Assisted Rotary Positive Displacement Device9 Dec 2021US 2021/0381506 A1ThermalTech Holdings, LLC
- Rotary internal combustion engine with unequal volumetric ratios23 Apr 2020US 2020/0123970 A1Pratt & Whitney Canada Corp.
- Variable displacement oil pump9 Apr 2020US 2020/0109709 A1Yamada Manufacturing Co., Ltd.
- Pump device12 Sep 2019US 2019/0277280 A1Aisin Seiki Kabushiki Kaisha
Most cited
By later US patents
- Synchronizing and unloading system for scroll fluid device45US 4,927,340 AArthur D. Little, Inc. · 1990
- Sliding vane engine42US 5,524,587 AMallen Research Limited Partnership · 1996
- Rotary vane motor23US 6,886,527 B2Rare Industries Inc. · 2005
- Fluid pressure device and shuttle valve assembly therefor21US 4,343,601 AEaton Corporation · 1982
- Rotary internal combustion engine19US 4,018,191 A1977