F01N 1/168
For controlling or modifying silencing characteristics only
Official title: {for controlling or modifying silencing characteristics only}
F01N1/168 (For controlling or modifying silencing characteristics only) appears on 72 US grants and 81 published applications in this corpus.
Search patents in F01N- Granted patents
- 72
- Published applications
- 81
- Assignees
- 37
- Inventors
- 164
- Latest grant
- 11 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 2 |
| 2005 | 1 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 1 | 1 |
| 2010 | 1 | 5 |
| 2011 | 1 | 1 |
| 2012 | 2 | 2 |
| 2013 | 1 | 2 |
| 2014 | 4 | 1 |
| 2015 | 0 | 2 |
| 2016 | 4 | 5 |
| 2017 | 7 | 16 |
| 2018 | 5 | 8 |
| 2019 | 13 | 12 |
| 2020 | 5 | 3 |
| 2021 | 4 | 8 |
| 2022 | 10 | 4 |
| 2023 | 4 | 3 |
| 2024 | 3 | 2 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Variable exhaust control system11 Nov 2025US 12,467,399 B2
- Dual mode muffler21 Oct 2025US 12,448,907 B2Tenneco Automotive Operating Company Inc.
- Methods and system for adjusting vehicle operation based on a predicted state of a vehicle occupant6 Aug 2024US 12,054,163 B2Ford Global Technologies, LLC
- Gas flow and sound control valve for exhaust gas system23 Apr 2024US 11,965,443 B2Akrapovic d.d.
- Method for interlocking engine exhaust sound with traveling mode and exhaust system for smart vehicle2 Jan 2024US 11,859,524 B2Hyundai Motor Company
- Dual Mode Muffler27 Feb 2025US 2025/0067201 A1Tenneco Automotive Operating Company Inc.
- Acoustic device for a vehicle19 Sep 2024US 2024/0308342 A1
- Automatic vehicle feature selection27 Jun 2024US 2024/0208507 A1GM Global Technology Operations LLC
- Muffler system with pneumatically actuated bypass valve23 Nov 2023US 2023/0374923 A1
- Flap Device9 Nov 2023US 2023/0358182 A1Friedrich Boysen GmbH & Co. KG
Most cited
By later US patents
- Muffler controller for use in controllable exhaust system of internal combustion engine26US 5,744,762 ACalsonic Corporation · 1998
- Exhaust valve with resilient spring pad22US 8,657,065 B1Tenneco Automotive Operating Company Inc. · 2014
- Muffler21US 4,971,166 ASango Co., Ltd. · 1990
- Gasoline particulate filter diagnostics19US 10,323,562 B2Ford Global Technologies, LLC · 2019
- Inlet or exhaust line for a reciprocating machine14US 5,655,367 ACentre National de la Recherche Scientifique (CNRS) · 1997