F01B 31/14
Changing of compression ratio
F01B31/14 (Changing of compression ratio) appears on 45 US grants and 47 published applications in this corpus.
Search patents in F01B- Granted patents
- 45
- Published applications
- 47
- Assignees
- 21
- Inventors
- 63
- Latest grant
- 20 Aug 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 3 |
| 2007 | 1 | 16 |
| 2008 | 8 | 0 |
| 2009 | 4 | 1 |
| 2010 | 4 | 1 |
| 2011 | 1 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 2 |
| 2017 | 1 | 0 |
| 2018 | 1 | 7 |
| 2019 | 6 | 5 |
| 2020 | 5 | 6 |
| 2021 | 3 | 4 |
| 2022 | 1 | 1 |
| 2023 | 2 | 0 |
| 2024 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
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Most cited
By later US patents
- Rotary valve system and engine using the same18US 7,325,520 B2Zajac Optimum Output Motors, Inc. · 2008
- Rotary valve system and engine using the same18US 7,328,674 B2Zajac Optimum Output Motors, Inc. · 2008
- Adjustable rotary actuator14US 4,545,289 A1985
- Steam admission valve and variable clearance volume steam cylinder11US 4,050,357 A1977
- Internal combustion engine and method11US 7,481,189 B2Zajac Optimum Output Motors, Inc. · 2009