F02M 23/04
Apparatus for adding secondary air to fuel-air mixture: with automatic control
Official title: with automatic control
F02M23/04 (Apparatus for adding secondary air to fuel-air mixture: with automatic control) appears on 299 US grants and 54 published applications in this corpus.
Search patents in F02M- Granted patents
- 299
- Published applications
- 54
- Assignees
- 101
- Inventors
- 493
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 17 | 0 |
| 1978 | 32 | 0 |
| 1979 | 16 | 0 |
| 1980 | 19 | 0 |
| 1981 | 27 | 0 |
| 1982 | 19 | 0 |
| 1983 | 9 | 0 |
| 1984 | 11 | 0 |
| 1985 | 14 | 0 |
| 1986 | 16 | 0 |
| 1987 | 15 | 0 |
| 1988 | 1 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 5 | 0 |
| 1994 | 4 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 3 | 1 |
| 2003 | 2 | 3 |
| 2004 | 3 | 4 |
| 2005 | 3 | 4 |
| 2006 | 3 | 4 |
| 2007 | 5 | 3 |
| 2008 | 1 | 2 |
| 2009 | 1 | 3 |
| 2010 | 2 | 0 |
| 2011 | 3 | 3 |
| 2012 | 1 | 2 |
| 2013 | 3 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 2 |
| 2016 | 3 | 1 |
| 2017 | 3 | 4 |
| 2018 | 0 | 2 |
| 2019 | 2 | 3 |
| 2020 | 3 | 5 |
| 2021 | 4 | 3 |
| 2022 | 3 | 0 |
| 2023 | 0 | 0 |
| 2024 | 1 | 1 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process for controlling a gaseous blend in a combustion chamber of a two-stroke cycle of an internal combustion engine3 Mar 2026US 12,565,867 B2
- Engine12 Nov 2024US 12,140,099 B2Subaru Corporation
- Air induction system with water detection15 Nov 2022US 11,498,582 B2Fca US LLC
- Oil carryover reduction system24 May 2022US 11,338,829 B2Transportation IP Holdings, LLC
- Liquid and/or gaseous fuel delivery system and methods thereof5 Apr 2022US 11,293,336 B2Ford Global Technologies, LLC
- Cycle based on compressed air by an auxiliary compressor for internal combustion engines17 Apr 2025US 2025/0122851 A1
- Engine4 Apr 2024US 2024/0110530 A1Subaru Corporation
- Reciprocating-piston internal combustion engine with device for increasing the torque thereof16 Sep 2021US 2021/0285361 A1
- Liquid and/or gaseous fuel delivery system and methods therof9 Sep 2021US 2021/0277820 A1Ford Global Technologies, LLC
- Air induction system with water detection5 Aug 2021US 2021/0237756 A1Fca US LLC
Most cited
By later US patents
- Method of reducing emission of pollutants from multi-cylinder engine61US 4,036,014 ANissan Motor Co., Ltd. · 1977
- Electromagnetic valve55US 4,858,886 AAisin Seiki Kabushiki Kaisha · 1989
- Vacuum operated valve mechanism51US 4,310,141 A1982
- Swirl forming device in combustion engine47US 7,140,347 B2Kawasaki Jukogyo Kabushiki Kaisha · 2006
- Electronically-controlled late cycle air injection to achieve simultaneous reduction of NOx and particulates emissions from a diesel engine46US 6,752,131 B2General Motors Corporation · 2004