F01N 1/24
Silencing apparatus characterised by method of silencing: by using sound-absorbing materials
Official title: by using sound-absorbing materials (F01N1/04, F01N1/06, F01N1/10, F01N1/14, F01N1/16 take precedence)
F01N1/24 (Silencing apparatus characterised by method of silencing: by using sound-absorbing materials) appears on 368 US grants and 264 published applications in this corpus.
Search patents in F01N- Granted patents
- 368
- Published applications
- 264
- Assignees
- 227
- Inventors
- 768
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 9 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 6 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 2 | 0 |
| 1991 | 11 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 4 | 0 |
| 1997 | 7 | 0 |
| 1998 | 17 | 0 |
| 1999 | 11 | 0 |
| 2000 | 18 | 0 |
| 2001 | 13 | 5 |
| 2002 | 14 | 21 |
| 2003 | 20 | 16 |
| 2004 | 8 | 13 |
| 2005 | 9 | 10 |
| 2006 | 6 | 10 |
| 2007 | 4 | 19 |
| 2008 | 11 | 13 |
| 2009 | 7 | 9 |
| 2010 | 8 | 9 |
| 2011 | 12 | 11 |
| 2012 | 8 | 6 |
| 2013 | 6 | 10 |
| 2014 | 5 | 11 |
| 2015 | 11 | 11 |
| 2016 | 12 | 13 |
| 2017 | 16 | 11 |
| 2018 | 6 | 7 |
| 2019 | 8 | 16 |
| 2020 | 4 | 6 |
| 2021 | 12 | 9 |
| 2022 | 8 | 5 |
| 2023 | 11 | 7 |
| 2024 | 6 | 7 |
| 2025 | 5 | 5 |
| 2026 | 1 | 4 |
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
- Sound absorbing element with low profile micro-louver slits and muffler assembly using the same9 Dec 2025US 12,492,654 B2ACS Industries, Inc.
- Exhaust gas assembly28 Oct 2025US 12,454,902 B2The University of Adelaide
- Turbo-compounded engine with exhaust duct acoustic arrangement16 Sep 2025US 12,415,611 B2Pratt & Whitney Canada Corp.
- Sound-dampening panels for an engine22 Jul 2025US 12,366,150 B1Caterpillar Inc.
- Silencer, pneumatic system or component, commercial vehicle, and method of exhausting gas from a pneumatic system for a vehicle18 Jun 2026US 2026/0167169 A1Zf Cv Systems Europe BV
- Exhaust muffler2 Apr 2026US 2026/0092545 A1Tenneco Automotive Operating Company Inc.
- Turbo-compounded engine with exhaust duct acoustic arrangement19 Mar 2026US 2026/0077875 A1Pratt & Whitney Canada Corp.
- Exhaust Muffler12 Mar 2026US 2026/0071564 A1Tenneco Automotive Operating Company Inc.
- Silencer, cooling system, motor system and generator system25 Sep 2025US 2025/0297563 A1ABB Schweiz AG
Most cited
By later US patents
- Outlet silencer and heat recovery structures for gas turbine177US 6,851,514 B2Air Handling Engineering Ltd. · 2005
- Exhaust muffler174US 4,880,078 AHonda Giken Kogyo Kabushiki Kaisha · 1989
- Vehicle exhaust system118US 7,766,123 B2Yamaha Hatsudoki Kabushiki Kaisha · 2010
- Blower pipe with silencer111US 5,841,080 AKioritz Corporation · 1998
- Foam catalyst support for exhaust purification83US 6,040,266 AUltramet · 2000