F01N 2490/15
Plurality of resonance or dead chambers
F01N2490/15 (Plurality of resonance or dead chambers) appears on 284 US grants and 110 published applications in this corpus.
Search patents in F01N- Granted patents
- 284
- Published applications
- 110
- Assignees
- 130
- Inventors
- 497
- Latest grant
- 9 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 4 | 0 |
| 1978 | 9 | 0 |
| 1979 | 5 | 0 |
| 1980 | 10 | 0 |
| 1981 | 7 | 0 |
| 1982 | 7 | 0 |
| 1983 | 7 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 5 | 0 |
| 1988 | 9 | 0 |
| 1989 | 8 | 0 |
| 1990 | 17 | 0 |
| 1991 | 7 | 0 |
| 1992 | 5 | 0 |
| 1993 | 9 | 0 |
| 1994 | 6 | 0 |
| 1995 | 6 | 0 |
| 1996 | 3 | 0 |
| 1997 | 5 | 0 |
| 1998 | 13 | 0 |
| 1999 | 12 | 0 |
| 2000 | 10 | 0 |
| 2001 | 4 | 0 |
| 2002 | 4 | 2 |
| 2003 | 5 | 0 |
| 2004 | 0 | 4 |
| 2005 | 2 | 8 |
| 2006 | 4 | 2 |
| 2007 | 1 | 4 |
| 2008 | 2 | 5 |
| 2009 | 2 | 3 |
| 2010 | 4 | 2 |
| 2011 | 2 | 4 |
| 2012 | 6 | 5 |
| 2013 | 6 | 4 |
| 2014 | 4 | 5 |
| 2015 | 3 | 4 |
| 2016 | 1 | 9 |
| 2017 | 10 | 3 |
| 2018 | 3 | 2 |
| 2019 | 2 | 14 |
| 2020 | 4 | 9 |
| 2021 | 7 | 7 |
| 2022 | 13 | 6 |
| 2023 | 8 | 4 |
| 2024 | 4 | 2 |
| 2025 | 4 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Muffler and method for making a muffler9 Dec 2025US 12,492,653 B2Purem GmbH
- Dual mode muffler21 Oct 2025US 12,448,907 B2Tenneco Automotive Operating Company Inc.
- Impact energy absorber with integrated engine exhaust noise muffler21 Jan 2025US 12,203,397 B2Divergent Technologies, Inc.
- Meta-muffler for reducing broadband noise14 Jan 2025US 12,196,114 B2Ajou University Industry-Academic Cooperation Foundation
- Muffler17 Sep 2024US 12,091,998 B2Purem GmbH
- Broadband silencer using acoustic metamaterial and method of designing the same1 May 2025US 2025/0140227 A1Ajou University Industry-Academic Cooperation Foundation
- Dual Mode Muffler27 Feb 2025US 2025/0067201 A1Tenneco Automotive Operating Company Inc.
- Sound attenuating engine exhaust system19 Dec 2024US 2024/0418111 A1K&N Engineering, Inc.
- Muffler for generating a sporty and rhythmic sound and a vehicle equipped with the same28 Mar 2024US 2024/0102408 A1Hyundai Motor Company
- Muffler with metallic meshed rings7 Dec 2023US 2023/0392827 A1Carrier Corporation
Most cited
By later US patents
- Exhaust muffler174US 4,880,078 AHonda Giken Kogyo Kabushiki Kaisha · 1989
- Straight through muffler with conically-ended output passage126US 6,158,546 ATenneco Automotive Inc. · 2000
- Muffler method and apparatus92US 4,064,962 AGarlock Inc. · 1977
- Exhaust silencer for a railway locomotive81US 4,203,503 ACentro Richerche Fiat S.p.A. · 1980
- Exhaust silencer for an agricultural tractor78US 4,209,076 ACentro Ricerche Fiat S.p.A. · 1980