F01N 3/031
Having means for by-passing filters
Official title: having means for by-passing filters, e.g. when clogged or during cold engine start
F01N3/031 (Having means for by-passing filters) appears on 318 US grants and 200 published applications in this corpus.
Search patents in F01N- Granted patents
- 318
- Published applications
- 200
- Assignees
- 144
- Inventors
- 591
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 7 | 0 |
| 1984 | 9 | 0 |
| 1985 | 9 | 0 |
| 1986 | 5 | 0 |
| 1987 | 8 | 0 |
| 1988 | 2 | 0 |
| 1989 | 10 | 0 |
| 1990 | 13 | 0 |
| 1991 | 12 | 0 |
| 1992 | 10 | 0 |
| 1993 | 14 | 0 |
| 1994 | 5 | 0 |
| 1995 | 10 | 0 |
| 1996 | 6 | 0 |
| 1997 | 8 | 0 |
| 1998 | 4 | 0 |
| 1999 | 5 | 0 |
| 2000 | 6 | 0 |
| 2001 | 2 | 3 |
| 2002 | 3 | 15 |
| 2003 | 7 | 14 |
| 2004 | 12 | 20 |
| 2005 | 14 | 13 |
| 2006 | 9 | 16 |
| 2007 | 10 | 7 |
| 2008 | 7 | 10 |
| 2009 | 4 | 11 |
| 2010 | 6 | 9 |
| 2011 | 13 | 10 |
| 2012 | 5 | 8 |
| 2013 | 6 | 5 |
| 2014 | 7 | 4 |
| 2015 | 4 | 8 |
| 2016 | 5 | 4 |
| 2017 | 6 | 8 |
| 2018 | 6 | 7 |
| 2019 | 8 | 5 |
| 2020 | 6 | 5 |
| 2021 | 3 | 6 |
| 2022 | 5 | 5 |
| 2023 | 4 | 3 |
| 2024 | 5 | 2 |
| 2025 | 4 | 2 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Exhaust purification apparatus24 Mar 2026US 12,584,430 B2Subaru Corporation
- Vehicle diagnostic device17 Feb 2026US 12,553,373 B2Toyota Jidosha Kabushiki Kaisha
- Work vehicle and aftertreatment system therefor7 Oct 2025US 12,435,654 B1Deere & Company
- Manifold assembly for trap filter systems23 Sep 2025US 12,420,225 B2Intel Corporation
- System and method for reducing internal combustion engine emissions23 Sep 2025US 12,421,881 B2Saudi Arabian Oil Company
- Exhaust purification apparatus20 Nov 2025US 2025/0354507 A1Subaru Corporation
- Vehicle diagnostic device25 Sep 2025US 2025/0297567 A1Toyota Jidosha Kabushiki Kaisha
- System and method for reducing internal combustion engine emissions28 Nov 2024US 2024/0392711 A1Aramco Overseas Company B.V.
- Reduction of tailpipe emissions from gasoline internal combustion engines with a combination of sorbents30 May 2024US 2024/0175382 A1Aramco Overseas Company B.V.
- Exhaust gas aftertreatment device21 Dec 2023US 2023/0407777 A1Vitesco Technologies GmbH
Most cited
By later US patents
- Exhaust processor114US 4,651,524 AArvin Industries, Inc. · 1987
- Exhaust emission control device for a diesel engine106US 4,934,142 AToyota Jidosha Kabushiki Kaisha · 1990
- Muffler apparatus with filter trap and method of use96US 4,851,015 ADonaldson Company, Inc. · 1989
- Device for collecting particulates in exhaust gases89US 4,427,418 AKabushiki Kaisha Toyota Chuo Kenkyusho · 1984
- Fast acting exhaust gas recirculation system87US 6,138,649 ASouthwest Research Institute · 2000