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Class Information
Number: 181/257
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With sound absorbing material > And multi-passage
Description: Subject matter having a plurality of passages between which the moving fluid is divided.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8627921 Exhaust filter Jan. 14, 2014
8550210 Resonant-type muffler Oct. 8, 2013
8439159 Exhaust muffler for internal combustion engines May. 14, 2013
8397493 Method for recovering waste heat from exhaust Mar. 19, 2013
8393147 Exhaust system having an aftertreatment module Mar. 12, 2013
8220253 Exhaust gas aftertreatment device for an internal combustion engine Jul. 17, 2012
8196703 Exhaust component Jun. 12, 2012
8172039 Muffler for vehicle May. 8, 2012
8141679 Absorptive muffler suspension Mar. 27, 2012
8042649 Vehicular muffler and motorcycle incorporating same Oct. 25, 2011
7955408 Device with no emission for treatment of exhaust gas Jun. 7, 2011
7942236 Exhaust device for straddle-type vehicle and straddle-type vehicle May. 17, 2011
7857095 Device with trace emission for treatment of exhaust gas Dec. 28, 2010
7806230 Absorptive muffler suspension Oct. 5, 2010
7789195 Muffler of internal combustion engine Sep. 7, 2010
7753167 Silencer Jul. 13, 2010
7624842 Exhaust system for an engine and motorcycle including the exhaust system Dec. 1, 2009
7571789 Muffler for exhaust systems of vehicles Aug. 11, 2009
7503427 Muffler Mar. 17, 2009
7484590 Fuel cell system with muffler Feb. 3, 2009
7472774 Versatile engine muffling system Jan. 6, 2009
7445083 Automotive muffler Nov. 4, 2008
7416052 Exhaust system of internal combustion engine Aug. 26, 2008
7380635 Interference-based exhaust noise attenuation Jun. 3, 2008
7380638 Exhaust noise control for motorcycles Jun. 3, 2008
7303048 Method for filtering ultrasonic noise within a fluid flow system Dec. 4, 2007
7303046 Apparatus for filtering ultrasonic noise within a fluid flow system Dec. 4, 2007
7287622 Exhaust muffler Oct. 30, 2007
7243757 Exhaust muffler Jul. 17, 2007
7225504 Noise suppressor for use with vacuum air cleaner Jun. 5, 2007
7174992 Muffler with secondary flow path Feb. 13, 2007
7077922 Technique to fill silencers Jul. 18, 2006
7040451 Automotive exhaust silencer system with variable damping characteristics May. 9, 2006
7004283 Multiple-chambered exhaust muffler Feb. 28, 2006
6868939 Exhaust silencer system Mar. 22, 2005
6622818 Sound attenuating device Sep. 23, 2003
6558137 Reciprocating piston compressor having improved noise attenuation May. 6, 2003
6467570 Spark arrester with spark filter Oct. 22, 2002
6446750 Process for filling a muffler shell with fibrous material Sep. 10, 2002
6412596 Process for filling a muffler and muffler filled with fibrous material Jul. 2, 2002
6382347 Exhaust muffler for an internal combustion engine May. 7, 2002
6082488 Muffler for vehicles Jul. 4, 2000
5859393 Reduced cost vent silencer Jan. 12, 1999
5783780 Sound absorption structure Jul. 21, 1998
5756944 Filter muffler May. 26, 1998
5731557 Fluid guiding element for blocking and damping noise propagating in main passages Mar. 24, 1998
5696361 Multi-ducts sound eliminator for air pipe Dec. 9, 1997
5679931 Sound attenuating apparatus and method of forming the same Oct. 21, 1997
5371331 Modular muffler for motor vehicles Dec. 6, 1994
5280143 Muffler with a scavenging effect Jan. 18, 1994

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