F01N 2490/00
Structure, disposition or shape of gas-chambers
F01N2490/00 (Structure, disposition or shape of gas-chambers) appears on 719 US grants and 486 published applications in this corpus.
Search patents in F01N- Granted patents
- 719
- Published applications
- 486
- Assignees
- 297
- Inventors
- 1,471
- Latest grant
- 21 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 9 | 0 |
| 1978 | 11 | 0 |
| 1979 | 5 | 0 |
| 1980 | 12 | 0 |
| 1981 | 8 | 0 |
| 1982 | 10 | 0 |
| 1983 | 8 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 7 | 0 |
| 1987 | 10 | 0 |
| 1988 | 11 | 0 |
| 1989 | 11 | 0 |
| 1990 | 22 | 0 |
| 1991 | 12 | 0 |
| 1992 | 11 | 0 |
| 1993 | 13 | 0 |
| 1994 | 8 | 0 |
| 1995 | 14 | 0 |
| 1996 | 8 | 0 |
| 1997 | 10 | 0 |
| 1998 | 16 | 0 |
| 1999 | 19 | 0 |
| 2000 | 14 | 0 |
| 2001 | 15 | 1 |
| 2002 | 9 | 11 |
| 2003 | 11 | 11 |
| 2004 | 12 | 12 |
| 2005 | 8 | 19 |
| 2006 | 8 | 14 |
| 2007 | 9 | 13 |
| 2008 | 10 | 24 |
| 2009 | 11 | 17 |
| 2010 | 17 | 20 |
| 2011 | 16 | 21 |
| 2012 | 23 | 20 |
| 2013 | 23 | 15 |
| 2014 | 22 | 25 |
| 2015 | 17 | 36 |
| 2016 | 25 | 27 |
| 2017 | 38 | 30 |
| 2018 | 19 | 15 |
| 2019 | 22 | 41 |
| 2020 | 21 | 30 |
| 2021 | 23 | 25 |
| 2022 | 38 | 24 |
| 2023 | 28 | 12 |
| 2024 | 12 | 9 |
| 2025 | 13 | 10 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- F01N 2490/15Plurality of resonance or dead chambersIndexing code284
- F01N 2490/02Two or more expansion chambers in series connected by means of tubesIndexing code228
- F01N 2490/08Two or more expansion chambers in series separated by apertured walls onlyIndexing code143
- F01N 2490/16Chambers with particular shapesIndexing code82
- F01N 2490/20Chambers being formed inside the exhaust pipe without enlargement of the crossIndexing code58
- F01N 2490/18Dimensional characteristics of gas chambersIndexing code52
- F01N 2490/14Dead or resonance chambers connected to gas flow tube by relatively shortIndexing code51
- F01N 2490/10Two or more expansion chambers in parallelIndexing code35
All 9 subgroupsShow fewer
Recent patents
- Noise cancelling device21 Jul 2026US 12,688,841 B1King Fahd University of Petroleum and Minerals
- Exhaust purification apparatus5 May 2026US 12,618,352 B2Toyota Jidosha Kabushiki Kaisha
- Exhaust purification apparatus24 Mar 2026US 12,584,430 B2Subaru Corporation
- Muffler and method for making a muffler9 Dec 2025US 12,492,653 B2Purem GmbH
- Muffler, exhaust system including a muffler, and method of making a muffler for an exhaust system11 Nov 2025US 12,467,392 B2Purem GmbH
- Burner for an Exhaust Gas System of an Internal Combustion Engine, in Particular of a Motor Vehicle, and Internal Combustion Engine, in Particular for a Motor Vehicle6 Aug 2026US 2026/0226855 A1Mercedes-Benz Group AG
- Damping Device25 Jun 2026US 2026/0177182 A1Hydac Technology GmbH
- Variable Muffler7 May 2026US 2026/0125997 A1
- Exhaust muffler2 Apr 2026US 2026/0092545 A1Tenneco Automotive Operating Company Inc.
- Exhaust gas purification device for internal combustion engine4 Dec 2025US 2025/0369378 A1
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
- Silencer100US 6,283,246 B1Betech Co., Ltd. · 2001
- Noise silencer97US 4,109,751 ADeere & Company · 1978
- Muffler method and apparatus92US 4,064,962 AGarlock Inc. · 1977