F01N 1/04
Having sound-absorbing materials in resonance chambers
Official title: having sound-absorbing materials in resonance chambers
F01N1/04 (Having sound-absorbing materials in resonance chambers) appears on 141 US grants and 121 published applications in this corpus.
Search patents in F01N- Granted patents
- 141
- Published applications
- 121
- Assignees
- 109
- Inventors
- 346
- Latest grant
- 21 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 4 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 2 | 0 |
| 2002 | 4 | 1 |
| 2003 | 6 | 4 |
| 2004 | 0 | 6 |
| 2005 | 3 | 10 |
| 2006 | 5 | 4 |
| 2007 | 5 | 7 |
| 2008 | 5 | 8 |
| 2009 | 8 | 7 |
| 2010 | 3 | 3 |
| 2011 | 7 | 8 |
| 2012 | 7 | 4 |
| 2013 | 5 | 5 |
| 2014 | 7 | 3 |
| 2015 | 2 | 4 |
| 2016 | 1 | 5 |
| 2017 | 8 | 6 |
| 2018 | 2 | 2 |
| 2019 | 6 | 5 |
| 2020 | 1 | 9 |
| 2021 | 4 | 5 |
| 2022 | 7 | 3 |
| 2023 | 5 | 3 |
| 2024 | 3 | 5 |
| 2025 | 1 | 3 |
| 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.
- Air warmer19 Nov 2024US 12,146,507 B2ICU Medical, Inc.
- Exhaust device and method of manufacturing thereof27 Aug 2024US 12,071,875 B2Tenneco Automotive Operating Company Inc.
- Engine assembly for a vehicle having a hydrocarbon trap27 Aug 2024US 12,071,887 B2Brp-Rotax GmbH & Co. KG
- Silencing apparatus and method for manufacturing silencing apparatus26 Dec 2023US 11,852,058 B2Sankei Giken Kogyo Co., Ltd.
- Muffler for Noise Reduction of Heat Dissipation Fan in Computer System27 Aug 2026US 2026/0251159 A1Celanese Mercury Holdings Inc.
- Silencer, cooling system, motor system and generator system25 Sep 2025US 2025/0297563 A1ABB Schweiz AG
- Acoustic metamaterial-based muffler for broadband exhaust noise reduction of internal combustion engines14 Aug 2025US 2025/0257675 A1Ajou University Industry-Academic Cooperation Foundation
- Dual Mode Muffler27 Feb 2025US 2025/0067201 A1Tenneco Automotive Operating Company Inc.
- Air warmer24 Oct 2024US 2024/0352947 A1Smiths Medical ASD, Inc.
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
- Reduced cost vent silencer72US 5,859,393 ANelson Industries, Inc. · 1999
- Exhaust muffler for internal combustion engines59US 5,198,625 A1993
- Stamp formed muffler54US 4,700,806 AAP Industries, Inc. · 1987