F01N
Gas-flow silencers or exhaust apparatus for machines or engines in general
Official title: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
F01N (Gas-flow silencers or exhaust apparatus for machines or engines in general) appears on 27,077 US grants and 26,291 published applications in this corpus.
Search patents in F01N- Granted patents
- 27,077
- Published applications
- 26,291
- Assignees
- 4,152
- Inventors
- 36,464
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 238 | 0 |
| 1977 | 139 | 0 |
| 1978 | 179 | 0 |
| 1979 | 134 | 0 |
| 1980 | 166 | 0 |
| 1981 | 150 | 0 |
| 1982 | 147 | 0 |
| 1983 | 136 | 0 |
| 1984 | 136 | 0 |
| 1985 | 122 | 0 |
| 1986 | 130 | 0 |
| 1987 | 163 | 0 |
| 1988 | 130 | 0 |
| 1989 | 201 | 0 |
| 1990 | 198 | 0 |
| 1991 | 216 | 0 |
| 1992 | 254 | 0 |
| 1993 | 271 | 0 |
| 1994 | 272 | 0 |
| 1995 | 361 | 0 |
| 1996 | 274 | 0 |
| 1997 | 295 | 0 |
| 1998 | 439 | 0 |
| 1999 | 413 | 0 |
| 2000 | 391 | 0 |
| 2001 | 447 | 182 |
| 2002 | 444 | 544 |
| 2003 | 481 | 641 |
| 2004 | 482 | 796 |
| 2005 | 487 | 777 |
| 2006 | 526 | 864 |
| 2007 | 475 | 1038 |
| 2008 | 458 | 1090 |
| 2009 | 564 | 1275 |
| 2010 | 731 | 1294 |
| 2011 | 808 | 1270 |
| 2012 | 1006 | 1187 |
| 2013 | 1073 | 1263 |
| 2014 | 1172 | 1360 |
| 2015 | 1291 | 1496 |
| 2016 | 1151 | 1423 |
| 2017 | 1328 | 1457 |
| 2018 | 1142 | 1450 |
| 2019 | 1422 | 1338 |
| 2020 | 1280 | 1313 |
| 2021 | 1156 | 1023 |
| 2022 | 1106 | 983 |
| 2023 | 888 | 746 |
| 2024 | 698 | 619 |
| 2025 | 642 | 482 |
| 2026 | 264 | 380 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
- F01N 3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise19,310
- F01N 13/00Exhaust or silencing apparatus characterised by constructional features10,787
- F01N 2610/00Adding substances to exhaust gasesIndexing code5,314
- F01N 2900/00Details of electrical control or of the monitoring of the exhaust gasIndexing code4,450
- F01N 2240/00Combination or association of two or more different exhaust treating devices, orIndexing code3,864
- F01N 11/00Monitoring or diagnostic devices for exhaust-gas treatment apparatus3,848
- F01N 9/00Electrical control of exhaust gas treating apparatus3,743
- F01N 2560/00Exhaust systems with means for detecting or measuring exhaust gas components orIndexing code3,629
All 33 main groupsShow fewer
- F01N 2330/00Structure of catalyst support or particle filterIndexing code2,685
- F01N 1/00Silencing apparatus characterised by method of silencing2,530
- F01N 2550/00Monitoring or diagnosing the deterioration of exhaust systemsIndexing code2,488
- F01N 2590/00Exhaust or silencing apparatus adapted to particular useIndexing code2,220
- F01N 2570/00Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compoundsIndexing code1,902
- F01N 2470/00Structure or shape of exhaust gas passages, pipes or tubesIndexing code1,896
- F01N 2260/00Exhaust treating devices having provisions not otherwise provided forIndexing code1,698
- F01N 2510/00Surface coveringsIndexing code1,483
- F01N 2450/00Methods or apparatus for fitting, inserting or repairing different elementsIndexing code1,455
- F01N 5/00Exhaust or silencing apparatus combined or associated with devices profiting by exhaust1,433
- F01N 2430/00Influencing exhaust purificationIndexing code1,427
- F01N 2370/00Selection of materials for exhaust purificationIndexing code1,032
- F01N 2250/00Combinations of different methods of purificationIndexing code1,027
- F01N 2410/00Gas-flow silencers or exhaust apparatus for machines or engines in general: by-passingIndexing code879
- F01N 2340/00Dimensional characteristics of the exhaust systemIndexing code778
- F01N 2490/00Structure, disposition or shape of gas-chambersIndexing code719
- F01N 2310/00Selection of sound absorbing or insulating materialIndexing code411
- F01N 2530/00Selection of materials for tubes, chambers or housingsIndexing code410
- F01N 2230/00Combination of silencers and other devicesIndexing code323
- F01N 2350/00Arrangements for fitting catalyst support or particle filter element in the housingIndexing code311
- F01N 2390/00Arrangements for controlling or regulating exhaust apparatusIndexing code285
- F01N 2270/00Mixing air with exhaust gasesIndexing code269
- F01N 2290/00Movable parts or members in exhaust systems for other than for controlIndexing code167
- F01N 2210/00Combination of methods of silencingIndexing code77
- F01N 99/00Subject matter not provided for in other groups of this subclass1
Recent patents
- Exhaust gas purification catalyst6 Oct 2026US 12,752,237 B2Cataler Corporation
- Engine device6 Oct 2026US 12,753,713 B2Yanmar Holdings Co., Ltd.
- Mixing tube for exhaust system and operating strategy for same6 Oct 2026US 12,753,714 B2Caterpillar Inc.
- Apparatus for diagnosing a post-processing system6 Oct 2026US 12,753,715 B2AVL Software and Functions GmbH
- Method, processing unit, and computer program for ascertaining fill levels of a first exhaust gas catalytic converter and of a second exhaust gas catalytic converter6 Oct 2026US 12,753,716 B2Robert Bosch GmbH
- Exhaust purification device8 Oct 2026US 2026/0307009 A1Mazda Motor Corporation
- System for treating an exhaust gas8 Oct 2026US 2026/0307052 A1Johnson Matthey Public Limited Company
- Pressurized systems and methods for providing a nebulized catalyst8 Oct 2026US 2026/0309066 A1Jake Vernon LLC
- Exhaust heat recovery device8 Oct 2026US 2026/0309067 A1
- Containerized ultra-low nox diesel engine generator set with roof-mounted selective catalytic reduction system8 Oct 2026US 2026/0309075 A1Industrial Service Solutions WC, Inc.
Most cited
By later US patents
- Remote power recharge for electronic equipment421US 7,068,991 B22006
- Diesel particulate trap330US 4,329,162 ACorning Glass Works · 1982
- Connecting structure for exhaust pipes269US 6,406,066 B1Honda Giken Kogyo Kabushiki Kaisha · 2002
- Radio frequency process sensing, control, and diagnostics network and system267US 10,118,119 B2CTS Corporation · 2018
- Device for removal of contaminants from fluid streams235US 5,750,026 ACorning Incorporated · 1998