F02B 53/04
Charge admission or combustion-gas discharge
F02B53/04 (Charge admission or combustion-gas discharge) appears on 377 US grants and 208 published applications in this corpus.
Search patents in F02B- Granted patents
- 377
- Published applications
- 208
- Assignees
- 96
- Inventors
- 492
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 36 | 0 |
| 1977 | 24 | 0 |
| 1978 | 18 | 0 |
| 1979 | 9 | 0 |
| 1980 | 12 | 0 |
| 1981 | 5 | 0 |
| 1982 | 11 | 0 |
| 1983 | 6 | 0 |
| 1984 | 8 | 0 |
| 1985 | 6 | 0 |
| 1986 | 8 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 7 | 0 |
| 1992 | 6 | 0 |
| 1993 | 9 | 0 |
| 1994 | 5 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 2 |
| 2002 | 2 | 3 |
| 2003 | 8 | 3 |
| 2004 | 0 | 6 |
| 2005 | 8 | 9 |
| 2006 | 3 | 5 |
| 2007 | 2 | 1 |
| 2008 | 2 | 5 |
| 2009 | 3 | 5 |
| 2010 | 3 | 7 |
| 2011 | 6 | 10 |
| 2012 | 4 | 4 |
| 2013 | 5 | 10 |
| 2014 | 8 | 8 |
| 2015 | 7 | 12 |
| 2016 | 9 | 15 |
| 2017 | 11 | 15 |
| 2018 | 19 | 15 |
| 2019 | 14 | 10 |
| 2020 | 15 | 14 |
| 2021 | 11 | 13 |
| 2022 | 13 | 12 |
| 2023 | 9 | 8 |
| 2024 | 10 | 4 |
| 2025 | 6 | 10 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
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Most cited
By later US patents
- Internal combustion engine with compound air compression138US 5,362,219 A1994
- Compound cycle rotary engine85US 7,753,036 B2United Technologies Corporation · 2010
- Constant pressure heating vane rotary engine52US 3,989,011 A1976
- Sliding vane engine42US 5,524,587 AMallen Research Limited Partnership · 1996
- Multi-fuel rotary power plants using gas pistons, elliptic compressors, internally cooled thermodynamic cycles and slurry type colloidal fuel from coal and charcoal41US 4,519,206 A1985