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Class Information
Number: 181/275
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With baffle or baffle structure > Expansion chamber type > And multi-passage
Description: Subject matter having a plurality of passages between which the moving fluid is divided.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8550210 Resonant-type muffler Oct. 8, 2013
8397493 Method for recovering waste heat from exhaust Mar. 19, 2013
8256571 Frequency-modifying muffler Sep. 4, 2012
8172039 Muffler for vehicle May. 8, 2012
8136629 Silencer/muffler Mar. 20, 2012
8016071 Multi-stage low pressure drop muffler Sep. 13, 2011
7980357 Exhaust silencer for microturbines Jul. 19, 2011
7955408 Device with no emission for treatment of exhaust gas Jun. 7, 2011
7942238 Marine muffler with angularly disposed internal baffle May. 17, 2011
7918311 Muffler and engine exhaust apparatus Apr. 5, 2011
7896127 Muffler unit for general-purpose engine Mar. 1, 2011
7874401 Exhaust muffler for exhaust system Jan. 25, 2011
7857095 Device with trace emission for treatment of exhaust gas Dec. 28, 2010
7849960 Silencer Dec. 14, 2010
7819223 Silencer for adsorption-based gas separation systems Oct. 26, 2010
7789195 Muffler of internal combustion engine Sep. 7, 2010
7770690 Double-flow exhaust system for an internal-combustion engine Aug. 10, 2010
7712578 Muffler of vehicle and exhaust apparatus using the same May. 11, 2010
7708114 Sound-attenuating muffler having reduced back pressure May. 4, 2010
7621373 Acoustic drain Nov. 24, 2009
7571789 Muffler for exhaust systems of vehicles Aug. 11, 2009
7549511 Exhaust sound and emission control systems Jun. 23, 2009
7540347 Exhaust system for motorcycle Jun. 2, 2009
7506723 Muffler for an exhaust gas system Mar. 24, 2009
7503427 Muffler Mar. 17, 2009
7445083 Automotive muffler Nov. 4, 2008
7438157 Muffler for an exhaust gas system Oct. 21, 2008
7426980 Internal combustion engine exhaust system Sep. 23, 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
7377359 Device for modulating noise in a motor vehicle May. 27, 2008
7287622 Exhaust muffler Oct. 30, 2007
7281606 Exhaust sound and emission control systems Oct. 16, 2007
7243757 Exhaust muffler Jul. 17, 2007
7191868 Combined silencer and spark arrester Mar. 20, 2007
7174992 Muffler with secondary flow path Feb. 13, 2007
7147082 Suction muffler for a reciprocating hermetic compressor Dec. 12, 2006
7104359 Muffler having a baffle with angled plates Sep. 12, 2006
7004283 Multiple-chambered exhaust muffler Feb. 28, 2006
6959782 Tuned exhaust system for small engines Nov. 1, 2005
6942061 Muffler for internal combustion engine Sep. 13, 2005
6935461 Exhaust sound and emission control systems Aug. 30, 2005
6915877 Muffler device Jul. 12, 2005
6832665 Exhaust gas muffler Dec. 21, 2004
6796402 Muffler having isolated dual flow baffle structure Sep. 28, 2004
6789644 Engine muffler Sep. 14, 2004
6736238 Air intake silencer May. 18, 2004
6659222 Multi-chambered muffler Dec. 9, 2003
6651773 Exhaust sound attenuation and control system Nov. 25, 2003

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