F01C 20/10
Control of, monitoring of, or safety arrangements for, machines or engines: characterised
Official title: characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
F01C20/10 (Control of, monitoring of, or safety arrangements for, machines or engines: characterised) appears on 80 US grants and 66 published applications in this corpus.
Search patents in F01C- Granted patents
- 80
- Published applications
- 66
- Assignees
- 42
- Inventors
- 117
- Latest grant
- 16 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 1 |
| 2005 | 1 | 2 |
| 2006 | 1 | 5 |
| 2007 | 2 | 2 |
| 2008 | 3 | 2 |
| 2009 | 1 | 4 |
| 2010 | 3 | 4 |
| 2011 | 1 | 1 |
| 2012 | 1 | 2 |
| 2013 | 0 | 4 |
| 2014 | 4 | 6 |
| 2015 | 5 | 9 |
| 2016 | 4 | 5 |
| 2017 | 5 | 4 |
| 2018 | 8 | 6 |
| 2019 | 4 | 3 |
| 2020 | 5 | 1 |
| 2021 | 4 | 1 |
| 2022 | 1 | 1 |
| 2023 | 0 | 0 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Quieted front exhaust motor16 Dec 2025US 12,496,699 B2Ingersoll-Rand Industrial U.S., Inc.
- Screw expander with variable volume controlled by the pressure ratio, and plant for recovering electrical energy from heat with a screw expander6 Aug 2024US 12,055,042 B2BITZER Kuehlmaschinenbau GmbH
- Four-stroke rotary- piston engine with adjustable compression ratio and adjustable valve control times1 Mar 2022US 11,261,733 B2
- Compound engine system with rotary engine30 Nov 2021US 11,187,146 B2Pratt & Whitney Canada Corp.
- Circulating piston engine having a rotary valve assembly24 Aug 2021US 11,098,588 B2WB Development Company, LLC
- Quieted front exhaust motor24 Oct 2024US 2024/0351180 A1Ingersoll-Rand Industrial U.S., Inc.
- Modular rotary engine1 Dec 2022US 2022/0381145 A1
- Screw expander, and plant for recovering electrical energy from heat with a screw expander16 Dec 2021US 2021/0388834 A1BITZER Kuehlmaschinenbau GmbH
- Compound engine system with rotary engine23 Apr 2020US 2020/0123971 A1Pratt & Whitney Canada Corp.
- Circulating piston engine having a rotary valve assembly8 Aug 2019US 2019/0242259 A1WB Development Company, LLC
Most cited
By later US patents
- Distributor for the progressive and reversible supply of an air motor, in particular for hand-held dental instruments40US 4,344,746 ASociete Micro-Mega S.A. · 1982
- Rotary engine with variable compression ratio39US 5,433,179 A1995
- High-power rotary engine with varaiable compression ratio37US 5,622,149 A1997
- Rotary engine with variable displacement35US 5,168,846 A1992
- Rotary internal combustion engine34US 4,241,713 A1980