F02M 23/00
Apparatus for adding secondary air to fuel-air mixture
F02M23/00 (Apparatus for adding secondary air to fuel-air mixture) appears on 511 US grants and 231 published applications in this corpus.
Search patents in F02M- Granted patents
- 511
- Published applications
- 231
- Assignees
- 183
- Inventors
- 877
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 21 | 0 |
| 1977 | 21 | 0 |
| 1978 | 37 | 0 |
| 1979 | 20 | 0 |
| 1980 | 23 | 0 |
| 1981 | 28 | 0 |
| 1982 | 24 | 0 |
| 1983 | 12 | 0 |
| 1984 | 15 | 0 |
| 1985 | 16 | 0 |
| 1986 | 16 | 0 |
| 1987 | 17 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 3 | 0 |
| 1993 | 8 | 0 |
| 1994 | 4 | 0 |
| 1995 | 4 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 7 | 0 |
| 1999 | 2 | 0 |
| 2000 | 5 | 0 |
| 2001 | 6 | 6 |
| 2002 | 12 | 8 |
| 2003 | 8 | 10 |
| 2004 | 8 | 16 |
| 2005 | 14 | 13 |
| 2006 | 10 | 12 |
| 2007 | 13 | 19 |
| 2008 | 11 | 11 |
| 2009 | 7 | 11 |
| 2010 | 8 | 9 |
| 2011 | 7 | 9 |
| 2012 | 6 | 7 |
| 2013 | 8 | 9 |
| 2014 | 7 | 8 |
| 2015 | 9 | 6 |
| 2016 | 10 | 12 |
| 2017 | 5 | 8 |
| 2018 | 5 | 11 |
| 2019 | 6 | 13 |
| 2020 | 16 | 12 |
| 2021 | 10 | 5 |
| 2022 | 8 | 2 |
| 2023 | 3 | 4 |
| 2024 | 3 | 5 |
| 2025 | 3 | 2 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F02M 23/04Apparatus for adding secondary air to fuel-air mixture: with automatic control299
- F02M 23/02Apparatus for adding secondary air to fuel-air mixture: with personal control, or62
- F02M 2023/008Apparatus for adding secondary air to fuel-air mixture: by injecting compressed airIndexing code41
- F02M 23/001Built into a flange35
- F02M 23/006Valves specially shaped for supplying secondary air29
- F02M 23/12Apparatus for adding secondary air to fuel-air mixture: characterised by being combined25
- F02M 23/14Apparatus for adding secondary air to fuel-air mixture: characterised by adding hot24
- F02M 23/003Particular shape of air intake13
All 9 subgroupsShow fewer
Recent patents
- Pre-chamber combustion systems and methods11 Aug 2026US 12,704,088 B2M2X Energy Inc.
- Systems, devices and methods for input and output pressure management of air breathing engine reformers10 Mar 2026US 12,570,526 B2M2X Energy Inc.
- 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
- Supply system6 May 2025US 12,292,020 B2Isuzu Motors Limited
- Gas mixer29 Apr 2025US 12,286,946 B2Caterpillar Energy Solutions GmbH
- Ducted fuel injection strategy employing air jet injection for aiding soot oxidation10 Sep 2026US 2026/0266245 A1Caterpillar Inc.
- Engine and operating strategy augmenting tumble flow to increase fuel-air mixing30 Jul 2026US 2026/0218671 A1Caterpillar Inc.
- Hydrogen powertrain23 Jul 2026US 2026/0208573 A1Ampere S.A.S.
- Method and device for monitoring a secondary air supply in an internal combustion engine15 May 2025US 2025/0154918 A1
- Cycle based on compressed air by an auxiliary compressor for internal combustion engines17 Apr 2025US 2025/0122851 A1
Most cited
By later US patents
- Bi-fuel control system and retrofit assembly for diesel engines231US 6,543,395 B2Gas Technologies LLC · 2003
- Method of reducing emission of pollutants from multi-cylinder engine61US 4,036,014 ANissan Motor Co., Ltd. · 1977
- Bi-fuel control system and assembly for reciprocating diesel engine powered electric generators58US 6,250,260 B12001
- Electromagnetic valve55US 4,858,886 AAisin Seiki Kabushiki Kaisha · 1989
- Vacuum operated valve mechanism51US 4,310,141 A1982