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Class Information
Number: 181/272
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With baffle or baffle structure > Expansion chamber type > Plural chambers
Description: Subject matter having more than one expansion chamber.










Patents under this class:
1 2 3 4 5 6 7 8 9

Patent Number Title Of Patent Date Issued
8684131 Dual muffler Apr. 1, 2014
8661795 Exhaust system having multiple inlets and multiple outlets Mar. 4, 2014
8640822 Exhaust muffler Feb. 4, 2014
8602157 Q4 muffler assembly Dec. 10, 2013
8579077 Horizontally installed muffler having sporty tone Nov. 12, 2013
8550057 Integral rotor noise attenuators Oct. 8, 2013
8544600 Exhaust device for internal combustion engine Oct. 1, 2013
8528693 Muffler with dual exhaust gas discharge pipe for vehicle Sep. 10, 2013
8418805 Muffler for vehicle Apr. 16, 2013
8359835 Exhaust device and vehicle with exhaust device Jan. 29, 2013
8307944 Muffler Nov. 13, 2012
8220587 Silencer cover for saddle-ride type vehicle Jul. 17, 2012
8215450 Exhaust muffler device Jul. 10, 2012
8196702 Muffler for vehicle Jun. 12, 2012
8191676 Resonator for a dual-flow exhaust system Jun. 5, 2012
8172039 Muffler for vehicle May. 8, 2012
8136350 Catalytic muffler having crossover passageway for secondary air Mar. 20, 2012
8091683 Motorcycle Jan. 10, 2012
8025123 Muffler structure for vehicle Sep. 27, 2011
8016071 Multi-stage low pressure drop muffler Sep. 13, 2011
8011471 Exhaust chamber for the exhaust line of an automobile Sep. 6, 2011
7992676 Compact tuned acoustic attenuation device Aug. 9, 2011
7993112 Compressor sound suppression Aug. 9, 2011
7942240 Silencer for internal combustion engine May. 17, 2011
7942238 Marine muffler with angularly disposed internal baffle May. 17, 2011
7934580 Long fiber thermoplastic composite muffler system May. 3, 2011
7934581 Broadband noise resonator May. 3, 2011
7926615 Method of making an exhaust-noise attenuation muffler, and exhaust-noise attenuation muffler Apr. 19, 2011
7918311 Muffler and engine exhaust apparatus Apr. 5, 2011
7905322 Marine muffler with angularly disposed internal baffle Mar. 15, 2011
7896127 Muffler unit for general-purpose engine Mar. 1, 2011
7870930 Exhaust system with external helmholtz resonator and associated method Jan. 18, 2011
7866442 Muffler and vehicle equipped with muffler Jan. 11, 2011
7849960 Silencer Dec. 14, 2010
7823692 Muffler for engines in oilfield applications Nov. 2, 2010
7819223 Silencer for adsorption-based gas separation systems Oct. 26, 2010
7806228 Single duct silencing terminal unit Oct. 5, 2010
7784586 Noise reduction structure for hybrid vehicle Aug. 31, 2010
7770690 Double-flow exhaust system for an internal-combustion engine Aug. 10, 2010
7753168 Muffler Jul. 13, 2010
7735604 Silencer of exhaust gases, in particular for motor vehicles Jun. 15, 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
7708115 Sound-attenuating muffler having reduced back pressure May. 4, 2010
7690479 Silencer Apr. 6, 2010
7669694 Muffler for vehicle Mar. 2, 2010
7617675 Catalyst chamber Nov. 17, 2009
7591345 Angled muffler seam construction and method Sep. 22, 2009
7584821 Adjustable helmholtz resonator Sep. 8, 2009
7581620 Marine muffler with angularly disposed internal baffle Sep. 1, 2009

1 2 3 4 5 6 7 8 9










 
 
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