F01N 3/22
Control of additional air supply only
Official title: Control of additional air supply only, e.g. using by-passes or variable air pump drives
F01N3/22 (Control of additional air supply only) appears on 785 US grants and 410 published applications in this corpus.
Search patents in F01N- Granted patents
- 785
- Published applications
- 410
- Assignees
- 230
- Inventors
- 1,518
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 44 | 0 |
| 1977 | 16 | 0 |
| 1978 | 28 | 0 |
| 1979 | 38 | 0 |
| 1980 | 31 | 0 |
| 1981 | 22 | 0 |
| 1982 | 13 | 0 |
| 1983 | 11 | 0 |
| 1984 | 12 | 0 |
| 1985 | 7 | 0 |
| 1986 | 4 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 9 | 0 |
| 1993 | 14 | 0 |
| 1994 | 16 | 0 |
| 1995 | 34 | 0 |
| 1996 | 23 | 0 |
| 1997 | 10 | 0 |
| 1998 | 25 | 0 |
| 1999 | 14 | 0 |
| 2000 | 17 | 0 |
| 2001 | 13 | 3 |
| 2002 | 13 | 8 |
| 2003 | 11 | 13 |
| 2004 | 17 | 25 |
| 2005 | 17 | 21 |
| 2006 | 16 | 13 |
| 2007 | 12 | 18 |
| 2008 | 6 | 14 |
| 2009 | 9 | 17 |
| 2010 | 10 | 24 |
| 2011 | 15 | 10 |
| 2012 | 11 | 18 |
| 2013 | 12 | 10 |
| 2014 | 20 | 15 |
| 2015 | 18 | 21 |
| 2016 | 17 | 16 |
| 2017 | 13 | 19 |
| 2018 | 13 | 14 |
| 2019 | 13 | 16 |
| 2020 | 17 | 18 |
| 2021 | 23 | 25 |
| 2022 | 28 | 25 |
| 2023 | 19 | 18 |
| 2024 | 22 | 16 |
| 2025 | 20 | 10 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Exhaust system and method of operating the same21 Jul 2026US 12,687,125 B1Saudi Arabian Oil Company
- Exhaust purification device20 Jan 2026US 12,528,049 B2Mazda Motor Corporation
- Internal combustion engine transient response18 Nov 2025US 12,473,867 B2Caterpillar Inc.
- Internal combustion engine control device and internal combustion engine control method11 Nov 2025US 12,467,417 B2Hitachi Astemo, Ltd.
- Systems and methods for supplementing an ammonia heat-exchange unit for engine cooling with a radiator14 Oct 2025US 12,442,324 B1First Ammonia Motors, Inc.
- Secondary Air Valve for a Secondary Air System of an Internal Combustion Engine, Internal Combustion Engine and Motor Vehicle30 Jul 2026US 2026/0218643 A1Mercedes-Benz Group AG
- Engine exhaust gas purification apparatus11 Jun 2026US 2026/0160193 A1Mazda Motor Corporation
- Method and Device for Controlling a Secondary Air Mass Flow in a Secondary Air Supply of an Internal Combustion Engine12 Mar 2026US 2026/0071566 A1Robert Bosch GmbH
- Enhanced operation of hydrogen and ammonia engines11 Dec 2025US 2025/0376937 A1
- Ignited reducing compositions and methods for catalytically decomposing exhaust gas mixtures9 Oct 2025US 2025/0314185 A1Altered Labs LLC
Most cited
By later US patents
- Method and apparatus for treating an engine exhaust gas stream154US 6,171,556 B2Engelhard Corporation · 2001
- Device for purifying exhaust gas of engine114US 6,014,859 AToyota Jidosha Kabushiki Kaisha · 2000
- Engine exhaust gas purification device108US 5,551,231 AToyota Jidosha Kabushiki Kaisha · 1996
- Adaptive exhaust temperature estimation and control105US 5,722,236 AFord Global Technologies, LLC · 1998
- Exhaust gas purification system for an internal combustion engine99US 5,331,809 AToyota Jidosha Kabushiki Kaisha · 1994