F01N 3/222
Using electric valves only
Official title: {using electric valves only}
F01N3/222 (Using electric valves only) appears on 278 US grants and 41 published applications in this corpus.
Search patents in F01N- Granted patents
- 278
- Published applications
- 41
- Assignees
- 78
- Inventors
- 485
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 16 | 0 |
| 1977 | 7 | 0 |
| 1978 | 16 | 0 |
| 1979 | 20 | 0 |
| 1980 | 18 | 0 |
| 1981 | 9 | 0 |
| 1982 | 8 | 0 |
| 1983 | 9 | 0 |
| 1984 | 10 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 6 | 0 |
| 1993 | 8 | 0 |
| 1994 | 12 | 0 |
| 1995 | 27 | 0 |
| 1996 | 18 | 0 |
| 1997 | 7 | 0 |
| 1998 | 15 | 0 |
| 1999 | 6 | 0 |
| 2000 | 10 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 1 |
| 2003 | 4 | 0 |
| 2004 | 4 | 5 |
| 2005 | 1 | 2 |
| 2006 | 0 | 0 |
| 2007 | 4 | 1 |
| 2008 | 0 | 3 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 2 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 2 | 0 |
| 2016 | 0 | 2 |
| 2017 | 1 | 2 |
| 2018 | 1 | 1 |
| 2019 | 2 | 2 |
| 2020 | 1 | 4 |
| 2021 | 5 | 4 |
| 2022 | 5 | 3 |
| 2023 | 1 | 3 |
| 2024 | 3 | 1 |
| 2025 | 1 | 2 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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
- Exhaust system, controller and method for an internal combustion engine5 Aug 2025US 12,378,905 B2Jaguar Land Rover Limited
- Method and device for diagnosing coking in a secondary air system of an internal combustion engine15 Oct 2024US 12,116,914 B2Vitesco Technologies GmbH
- Valve for preventing backflow and valve module23 Apr 2024US 11,965,609 B2Kamtec Inc.
- Exhaust purification device28 Aug 2025US 2025/0269326 A1Mazda Motor Corporation
- Vehicle3 Apr 2025US 2025/0109727 A1Kawasaki Motors, Ltd.
- Exhaust system, controller and method for an internal combustion engine1 Aug 2024US 2024/0254905 A1Jaguar Land Rover Limited
- Exhaust aftertreatment system6 Apr 2023US 2023/0105660 A1Volvo Truck Corporation
- Method, processing unit, and computer program for ascertaining an air volume provided by means of an electric air pump in an exhaust system of an internal combustion engine2 Mar 2023US 2023/0061467 A1Robert Bosch GmbH
Most cited
By later US patents
- 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
- Exhaust gas purification device for an engine83US 5,433,074 AToyota Jidosha Kabushiki Kaisha · 1995