F01N 1/026
Annular resonance chambers arranged concentrically to an exhaust passage and communicating with
Official title: {Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage}
F01N1/026 (Annular resonance chambers arranged concentrically to an exhaust passage and communicating with) appears on 109 US grants and 122 published applications in this corpus.
Search patents in F01N- Granted patents
- 109
- Published applications
- 122
- Assignees
- 65
- Inventors
- 265
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 5 | 6 |
| 2013 | 6 | 3 |
| 2014 | 4 | 6 |
| 2015 | 3 | 6 |
| 2016 | 7 | 10 |
| 2017 | 8 | 12 |
| 2018 | 7 | 7 |
| 2019 | 10 | 12 |
| 2020 | 6 | 16 |
| 2021 | 6 | 22 |
| 2022 | 24 | 4 |
| 2023 | 13 | 3 |
| 2024 | 3 | 4 |
| 2025 | 4 | 3 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Acoustic metamaterial-based muffler for exhaust noise reduction11 Aug 2026US 12,704,084 B2Ajou University Industry-Academic Cooperation Foundation
- Acoustic metamaterial-based muffler for broadband exhaust noise reduction of internal combustion engines14 Jul 2026US 12,680,484 B2Ajou University Industry-Academic Cooperation Foundation
- Tunable exhaust system16 Dec 2025US 12,497,913 B2Advanced Flow Engineering, Inc.
- Dual mode muffler21 Oct 2025US 12,448,907 B2Tenneco Automotive Operating Company Inc.
- Exhaust sound attenuation and control system20 May 2025US 12,305,546 B2
- Fluid piping6 Aug 2026US 2026/0227020 A1Nissan Motor Co., Ltd.
- Tunable Exhaust System2 Apr 2026US 2026/0092544 A1Advanced Flow Engineering, Inc.
- Muffler for an exhaust system and method for making a muffler8 Jan 2026US 2026/0009348 A1Purem GmbH
- Exhaust port for a pneumatic valve or an air valve of a vehicle21 Aug 2025US 2025/0264045 A1Volvo Truck Corporation
- Acoustic metamaterial-based muffler for broadband exhaust noise reduction of internal combustion engines14 Aug 2025US 2025/0257675 A1Ajou University Industry-Academic Cooperation Foundation
Most cited
By later US patents
- Concentric pass-type muffler construction18US 4,143,739 ANelson Industries, Inc. · 1979
- Channeling gas flow tube15US 8,479,878 B2Parallaxial Innovation LLC · 2013
- Channeling fluidic waveguide surfaces and tubes15US 9,739,296 B2Parafluidics, LLC · 2017
- Horizontally installed muffler having sporty tone11US 8,579,077 B2Hyundai Motor Company · 2013
- Exhaust sound attenuation device and method of use9US 8,256,569 B12012