F01N 2490/08
Two or more expansion chambers in series separated by apertured walls only
F01N2490/08 (Two or more expansion chambers in series separated by apertured walls only) appears on 143 US grants and 120 published applications in this corpus.
Search patents in F01N- Granted patents
- 143
- Published applications
- 120
- Assignees
- 72
- Inventors
- 343
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 1 |
| 2002 | 2 | 3 |
| 2003 | 3 | 3 |
| 2004 | 4 | 4 |
| 2005 | 2 | 5 |
| 2006 | 2 | 4 |
| 2007 | 3 | 1 |
| 2008 | 4 | 10 |
| 2009 | 4 | 3 |
| 2010 | 6 | 3 |
| 2011 | 4 | 3 |
| 2012 | 5 | 3 |
| 2013 | 2 | 5 |
| 2014 | 2 | 5 |
| 2015 | 5 | 8 |
| 2016 | 6 | 8 |
| 2017 | 13 | 6 |
| 2018 | 3 | 5 |
| 2019 | 5 | 16 |
| 2020 | 7 | 5 |
| 2021 | 4 | 7 |
| 2022 | 11 | 5 |
| 2023 | 10 | 4 |
| 2024 | 1 | 0 |
| 2025 | 5 | 3 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Exhaust purification apparatus24 Mar 2026US 12,584,430 B2Subaru Corporation
- Muffler, exhaust system including a muffler, and method of making a muffler for an exhaust system11 Nov 2025US 12,467,392 B2Purem GmbH
- Selective catalytic reduction (SCR) system and engine11 Nov 2025US 12,467,394 B2Weichai Power Co., Ltd.
- Inlet assembly for aftertreatment system8 Jul 2025US 12,352,199 B1Caterpillar Inc.
- Muffler1 Apr 2025US 12,263,954 B2Orbital Australia Pty Ltd
- Exhaust purification apparatus20 Nov 2025US 2025/0354507 A1Subaru Corporation
- Exhaust device17 Apr 2025US 2025/0122819 A1Kawasaki Motors, Ltd.
- Selective catalytic reduction (scr) system and engine27 Mar 2025US 2025/0101897 A1Weichai Power Co., Ltd.
- Muffler14 Dec 2023US 2023/0399963 A1Purem GmbH
- Meta-muffler for reducing broadband noise15 Jun 2023US 2023/0184147 A1Ajou University Industry-Academic Cooperation Foundation
Most cited
By later US patents
- Automobile exhaust noise suppressor54US 5,614,699 ANissan Motor Co., Ltd. · 1997
- Exhaust muffler comprising a catalytic converter39US 6,393,835 B1Andreas Stihl AG & CO.KG · 2002
- Internal combustion engine exhaust system35US 4,628,689 A1986
- Automobile exhaust noise suppressor34US 5,739,483 ANissan Motor Co., Ltd. · 1998
- Muffler30US 4,416,350 ANissan Motor Co., Ltd. · 1983