F01N 13/04
Exhaust or silencing apparatus characterised by constructional features: having two or more
Official title: having two or more silencers in parallel, e.g. having interconnections for multi-cylinder engines
F01N13/04 (Exhaust or silencing apparatus characterised by constructional features: having two or more) appears on 144 US grants and 122 published applications in this corpus.
Search patents in F01N- Granted patents
- 144
- Published applications
- 122
- Assignees
- 70
- Inventors
- 312
- Latest grant
- 21 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 0 |
| 2002 | 4 | 3 |
| 2003 | 4 | 4 |
| 2004 | 3 | 1 |
| 2005 | 1 | 4 |
| 2006 | 3 | 3 |
| 2007 | 2 | 6 |
| 2008 | 2 | 5 |
| 2009 | 3 | 3 |
| 2010 | 4 | 7 |
| 2011 | 2 | 6 |
| 2012 | 3 | 6 |
| 2013 | 8 | 8 |
| 2014 | 8 | 7 |
| 2015 | 8 | 7 |
| 2016 | 7 | 4 |
| 2017 | 8 | 10 |
| 2018 | 5 | 7 |
| 2019 | 8 | 7 |
| 2020 | 10 | 9 |
| 2021 | 5 | 1 |
| 2022 | 4 | 7 |
| 2023 | 6 | 3 |
| 2024 | 6 | 2 |
| 2025 | 3 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Dual mode muffler21 Oct 2025US 12,448,907 B2Tenneco Automotive Operating Company Inc.
- Exhaust silencing device and system, vehicle, and exhaust silencing method2 Sep 2025US 12,404,790 B2Zhejiang Geely Holding Group Co., Ltd.
- System and method for a cab-mounted muffler assembly4 Feb 2025US 12,215,612 B2Transportation IP Holdings, LLC
- Exhaust pipe bridge15 Oct 2024US 12,116,915 B2Tenneco Automotive Operating Company Inc.
- Exhaust gas system for a motorcycle27 Aug 2024US 12,071,883 B2PIAGGIO & C. S. p. A.
- Series hybrid car19 Mar 2026US 2026/0077642 A1
- Dual Mode Muffler27 Feb 2025US 2025/0067201 A1Tenneco Automotive Operating Company Inc.
- Exhaust Pipe Bridge4 Jul 2024US 2024/0218821 A1Tenneco Automotive Operating Company Inc.
- Exhaust gas system for a motorcycle4 Jan 2024US 2024/0003277 A1PIAGGIO & C. S. p. A.
- Duckbill aerosol separator with always open refinement7 Sep 2023US 2023/0279796 A1Cummins Filtration IP, Inc.
Most cited
By later US patents
- Engine-control apparatus48US 4,926,636 AMazda Motor Corporation · 1990
- Exhaust sound attenuation and control system42US 6,651,773 B12003
- Portable energy generation systems41US 8,567,354 B2Clear Energy Systems, Inc. · 2013
- Easily controlled exhaust pipe39US 6,598,390 B2Liang Fei Industry Co., Ltd. · 2003
- Exhaust sound and emission control systems39US 6,935,461 B22005