F01N 2490/02
Two or more expansion chambers in series connected by means of tubes
F01N2490/02 (Two or more expansion chambers in series connected by means of tubes) appears on 228 US grants and 198 published applications in this corpus.
Search patents in F01N- Granted patents
- 228
- Published applications
- 198
- Assignees
- 113
- Inventors
- 520
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 3 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 4 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 3 | 2 |
| 2003 | 2 | 4 |
| 2004 | 4 | 5 |
| 2005 | 2 | 5 |
| 2006 | 3 | 4 |
| 2007 | 5 | 6 |
| 2008 | 2 | 12 |
| 2009 | 3 | 8 |
| 2010 | 10 | 8 |
| 2011 | 9 | 7 |
| 2012 | 5 | 9 |
| 2013 | 8 | 2 |
| 2014 | 12 | 12 |
| 2015 | 7 | 23 |
| 2016 | 12 | 11 |
| 2017 | 18 | 12 |
| 2018 | 10 | 1 |
| 2019 | 6 | 20 |
| 2020 | 8 | 19 |
| 2021 | 11 | 11 |
| 2022 | 22 | 9 |
| 2023 | 12 | 3 |
| 2024 | 3 | 3 |
| 2025 | 2 | 0 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Noise cancelling device21 Jul 2026US 12,688,841 B1King Fahd University of Petroleum and Minerals
- Exhaust gas treatment unit8 Apr 2025US 12,270,324 B2Tenneco Inc.
- Annular catalytic converter21 Jan 2025US 12,201,941 B2Vitesco Technologies GmbH
- Exhaust gas aftertreatment device3 Dec 2024US 12,158,094 B2Vitesco Technologies GmbH
- Muffler and method for making the same1 Oct 2024US 12,104,512 B2Purem GmbH
- Variable Muffler7 May 2026US 2026/0125997 A1
- Exhaust muffler2 Apr 2026US 2026/0092545 A1Tenneco Automotive Operating Company Inc.
- Exhaust gas treatment unit4 Jul 2024US 2024/0218819 A1Tenneco Inc.
- Vehicle exhaust system with end cap mixer20 Jun 2024US 2024/0200482 A1Cummins Emission Solutions Inc.
- Muffler for an exhaust system30 May 2024US 2024/0175381 A1Hug Engineering AG
Most cited
By later US patents
- Exhaust muffler174US 4,880,078 AHonda Giken Kogyo Kabushiki Kaisha · 1989
- Noise silencer97US 4,109,751 ADeere & Company · 1978
- Catalytic converter82US 6,722,124 B2Nelson Burgess Limited · 2004
- Flattened venturi, method and apparatus for making58US 4,690,245 AStemco Co., Ltd. · 1987
- Automobile exhaust noise suppressor54US 5,614,699 ANissan Motor Co., Ltd. · 1997