F02M 31/08
The gases being exhaust gases
Official title: the gases being exhaust gases {(adding exhaust gases to the air intake passage F02M26/00)}
F02M31/08 (The gases being exhaust gases) appears on 255 US grants and 129 published applications in this corpus.
Search patents in F02M- Granted patents
- 255
- Published applications
- 129
- Assignees
- 110
- Inventors
- 379
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 25 | 0 |
| 1977 | 15 | 0 |
| 1978 | 16 | 0 |
| 1979 | 10 | 0 |
| 1980 | 10 | 0 |
| 1981 | 4 | 0 |
| 1982 | 7 | 0 |
| 1983 | 8 | 0 |
| 1984 | 6 | 0 |
| 1985 | 3 | 0 |
| 1986 | 5 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 5 | 5 |
| 2003 | 2 | 5 |
| 2004 | 5 | 4 |
| 2005 | 9 | 4 |
| 2006 | 2 | 5 |
| 2007 | 6 | 4 |
| 2008 | 1 | 8 |
| 2009 | 6 | 4 |
| 2010 | 2 | 4 |
| 2011 | 2 | 10 |
| 2012 | 3 | 7 |
| 2013 | 6 | 7 |
| 2014 | 9 | 6 |
| 2015 | 3 | 6 |
| 2016 | 6 | 4 |
| 2017 | 11 | 11 |
| 2018 | 5 | 9 |
| 2019 | 5 | 10 |
| 2020 | 5 | 2 |
| 2021 | 9 | 3 |
| 2022 | 5 | 2 |
| 2023 | 4 | 4 |
| 2024 | 1 | 1 |
| 2025 | 0 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F02M 31/087Heat-exchange arrangements between the air intake and exhaust gas passages139
- F02M 31/0825Particular constructional characteristics of the heat exchange surfaces23
- F02M 31/083Temperature-responsive control of the amount of exhaust gas or combustion air directed13
- F02M 31/0805Pneumatic control of the amount of exhaust gas or combustion air directed6
- F02M 31/081Manual switching of the fluids directed to the heat exchange surfaces3
- F02M 31/0815Heat exchange surfaces arranged inside a flange2
- F02M 31/082Particular shape of air input passage near to the branch1
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Most cited
By later US patents
- Method and apparatus for operation of combustion engines205US 6,155,212 A2000
- Internal combustion engine with an exhaust gas recirculation system118US 5,740,786 AMercedes-Benz AG · 1998
- Method and apparatus for improved operation of internal combustion engines115US 5,343,699 A1994
- Energy conversion system106US 6,756,140 B12004
- Internal combustion engine equipped with fuel reforming system69US 6,318,306 B1Nissan Motor Co., Ltd. · 2001