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Class Information
Number: 181/254
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Straight-through passage > With muffler bypass > Valve controlled
Description: Subject matter having means to vary the rate of fluid flow in either the through or the bypass passage.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8701823 Exhaust system for motorcycle Apr. 22, 2014
8657065 Exhaust valve with resilient spring pad Feb. 25, 2014
8646260 Two-stroke lean burn gas engine with a silencer/catalytic converter Feb. 11, 2014
8579077 Horizontally installed muffler having sporty tone Nov. 12, 2013
8511428 Noise attenuator and vehicle air intake duct provided therewith Aug. 20, 2013
8479879 Expandable chamber acoustic silencer Jul. 9, 2013
8469142 Muffler assembly Jun. 25, 2013
8468813 Snap-action valve for exhaust system Jun. 25, 2013
8418445 Exhaust system for an internal combustion engine Apr. 16, 2013
8397863 Muffler with a built-in heat exchanger Mar. 19, 2013
8393147 Exhaust system having an aftertreatment module Mar. 12, 2013
8365522 Dual exhaust system with independent valve control Feb. 5, 2013
8302393 Exhaust system of an internal combustion engine Nov. 6, 2012
8292024 Retainer device for a reducing agent metering valve Oct. 23, 2012
8256570 Exhaust flow control device for exhaust muffler Sep. 4, 2012
8201660 Valve for a motor vehicle exhaust silencer, and silencer comprising a valve of this type Jun. 19, 2012
8191677 Exhaust and cooling systems for implementation in reduced-size vehicle Jun. 5, 2012
8181737 Condensed water discharge apparatus of muffler May. 22, 2012
8123498 Tunable choke tube for pulsation control device used with gas compressor Feb. 28, 2012
8109084 Exhaust device for motorcycle Feb. 7, 2012
8033358 Noise controlled turbine engine with aircraft engine adaptive noise control tubes Oct. 11, 2011
8033359 Intake sound adjusting device Oct. 11, 2011
7967107 Muffler apparatus for vehicle Jun. 28, 2011
7938227 Variable resonation chamber valve May. 10, 2011
7938226 Exhaust system for internal combustion engine having temperature variable acoustics May. 10, 2011
7913809 Flapper configuration for marine exhaust system Mar. 29, 2011
7913810 High-performance muffler assembly with multiple modes of operation Mar. 29, 2011
7905320 Exhaust system for saddle-ride type vehicle Mar. 15, 2011
7896128 Auto-sensing, automatic adjusting exhaust baffle Mar. 1, 2011
7896130 Snap action valve with inertia damper Mar. 1, 2011
7849959 Exhaust pipe structure for vehicle Dec. 14, 2010
7849960 Silencer Dec. 14, 2010
7828114 Exhaust device for motorcycle engine Nov. 9, 2010
7779962 Muffler Aug. 24, 2010
7775322 Snap-action valve for exhaust system Aug. 17, 2010
7753168 Muffler Jul. 13, 2010
7703574 Exhaust system Apr. 27, 2010
7690194 Two-stroke lean burn gas engine with a silencer/catalytic converter Apr. 6, 2010
7686130 Dual mode vehicle exhaust system and associated method Mar. 30, 2010
7673720 High-performance muffler assembly with multiple modes of operation Mar. 9, 2010
7628250 Passive valve assembly for vehicle exhaust system Dec. 8, 2009
7575096 Pressed assembly for passive valve installation Aug. 18, 2009
7562741 Rear muffler assembly Jul. 21, 2009
7533760 Noise reduction tubes May. 19, 2009
7527126 Exhaust apparatus of an internal combustion engine May. 5, 2009
7510051 Switchable loud and quiet exhaust apparatus Mar. 31, 2009
7506723 Muffler for an exhaust gas system Mar. 24, 2009
7484591 Muffler outlet part for a motorcycle muffler Feb. 3, 2009
7464543 Two-stroke lean burn gas engine with a silencer/catalytic converter Dec. 16, 2008
7438157 Muffler for an exhaust gas system Oct. 21, 2008

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