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Class Information
Number: 181/253
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Straight-through passage > With muffler bypass
Description: Subject matter having one or more passages, which performs a muffling function, which bypass the whole or part of the through passage.










Sub-classes under this class:

Class Number Class Name Patents
181/254 Valve controlled 124


Patents under this class:

Patent Number Title Of Patent Date Issued
8646260 Two-stroke lean burn gas engine with a silencer/catalytic converter Feb. 11, 2014
8550210 Resonant-type muffler Oct. 8, 2013
8418445 Exhaust system for an internal combustion engine Apr. 16, 2013
8365522 Dual exhaust system with independent valve control Feb. 5, 2013
8302393 Exhaust system of an internal combustion engine Nov. 6, 2012
8109084 Exhaust device for motorcycle Feb. 7, 2012
8068575 Acoustic load mitigator Nov. 29, 2011
7946383 Acoustic load mitigator May. 24, 2011
7849960 Silencer Dec. 14, 2010
7703574 Exhaust system Apr. 27, 2010
7690194 Two-stroke lean burn gas engine with a silencer/catalytic converter Apr. 6, 2010
7585158 Piston engine comprising a pulsation-reducing device Sep. 8, 2009
7575096 Pressed assembly for passive valve installation Aug. 18, 2009
7533760 Noise reduction tubes May. 19, 2009
7506723 Muffler for an exhaust gas system Mar. 24, 2009
7503426 Reflecting plate type silencer pipe Mar. 17, 2009
7497300 Noise reduction tubes Mar. 3, 2009
7484590 Fuel cell system with muffler Feb. 3, 2009
7464543 Two-stroke lean burn gas engine with a silencer/catalytic converter Dec. 16, 2008
7428947 Electrically controlled in-muffler exhaust valve for use during cylinder deactivation Sep. 30, 2008
7416051 Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes Aug. 26, 2008
7416052 Exhaust system of internal combustion engine Aug. 26, 2008
7380638 Exhaust noise control for motorcycles Jun. 3, 2008
7174992 Muffler with secondary flow path Feb. 13, 2007
7117973 Noise suppressor apparatus for a gas duct Oct. 10, 2006
7055648 Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes Jun. 6, 2006
7051523 Exhaust system assemblies employing wire bushings for thermal compensation May. 30, 2006
7040451 Automotive exhaust silencer system with variable damping characteristics May. 9, 2006
7017707 Herschel-Quincke tube for vehicle applications Mar. 28, 2006
6938727 Integrated engine compartment component and air intake system Sep. 6, 2005
6932189 Device for noise structuring in a motor vehicle Aug. 23, 2005
6802387 Muffler with external water trap Oct. 12, 2004
6595320 Apparatus for controlling exhaust gas in internal combustion engine Jul. 22, 2003
6467570 Spark arrester with spark filter Oct. 22, 2002
6196187 Idle air bypass valve silencer Mar. 6, 2001
6178745 Exhaust assembly for use with combustion engines, and vehicle provided with such assembly Jan. 30, 2001
5979596 Automatic compression brake muffler Nov. 9, 1999
5947082 Idle air bypass valve silencer Sep. 7, 1999
5723827 Noise suppressing muffler Mar. 3, 1998
5280143 Muffler with a scavenging effect Jan. 18, 1994
4866933 Exhaust silencer Sep. 19, 1989
4779705 Header exhaust adapter Oct. 25, 1988
4310067 Optimized diesel engine exhaust silencer Jan. 12, 1982
3977493 Exhaust control method and apparatus Aug. 31, 1976











 
 
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