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Class Information
Number: 181/273
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With baffle or baffle structure > Expansion chamber type > And side branch chamber
Description: Subject matter having cushion, acoustic filter, or resonator chambers in communication with the fluid passages.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8477039 Providing information related to the posture mode of a user applying pressure to a seat component Jul. 2, 2013
8468825 Method for producing shaft horsepower using waste heat Jun. 25, 2013
8381871 Compact low frequency resonator Feb. 26, 2013
8359836 Internal combustion engine, vehicle, marine vessel, and secondary air supply method for internal combustion engine Jan. 29, 2013
8316639 Internal combustion engine, vehicle, marine vessel, and exhaust gas cleaning method for internal combustion engine Nov. 27, 2012
8312713 Internal combustion engine, vehicle, marine vessel, and exhausting method for internal combustion engine Nov. 20, 2012
8307945 Gas-turbine exhaust cone Nov. 13, 2012
7992676 Compact tuned acoustic attenuation device Aug. 9, 2011
7946382 Gas compressor with side branch absorber for pulsation control May. 24, 2011
7870930 Exhaust system with external helmholtz resonator and associated method Jan. 18, 2011
7845466 Sound generator with structurally and acoustically coupled sound radiation panel and method for manufacturing the same Dec. 7, 2010
7794213 Integrated acoustic damper with thin sheet insert Sep. 14, 2010
7735604 Silencer of exhaust gases, in particular for motor vehicles Jun. 15, 2010
7600607 Flow-through sound-cancelling mufflers Oct. 13, 2009
7584821 Adjustable helmholtz resonator Sep. 8, 2009
7575096 Pressed assembly for passive valve installation Aug. 18, 2009
7540353 Resonator Jun. 2, 2009
7527125 Muffler for an exhaust system May. 5, 2009
7506723 Muffler for an exhaust gas system Mar. 24, 2009
7461719 Resonator performance by local reduction of component thickness Dec. 9, 2008
7380635 Interference-based exhaust noise attenuation Jun. 3, 2008
7367424 Eccentric exhaust muffler for use with auxiliary power units May. 6, 2008
7364013 Shell main body for muffler Apr. 29, 2008
7337877 Variable geometry resonator for acoustic control Mar. 4, 2008
7337876 Suction apparatus with noise reduction means Mar. 4, 2008
7334663 Variable resonator Feb. 26, 2008
7299894 Acoustic fluid machine Nov. 27, 2007
7293628 Shell main body for muffler Nov. 13, 2007
7293627 Active exhaust muffler Nov. 13, 2007
7281605 Mufflers with enhanced acoustic performance at low and moderate frequencies Oct. 16, 2007
7278514 Acoustic noise filter Oct. 9, 2007
7255197 Muffler Aug. 14, 2007
7252178 Acoustic fluid machine Aug. 7, 2007
7246680 Sound dampening assembly for automotive exhaust system Jul. 24, 2007
7240769 Exhaust volume Jul. 10, 2007
7194862 Resonator adopting counter-bored holes and method of suppressing combustion instabilities Mar. 27, 2007
7117974 Electronically controlled dual chamber variable resonator Oct. 10, 2006
7017707 Herschel-Quincke tube for vehicle applications Mar. 28, 2006
6832664 Clampless hose retainer mechanism Dec. 21, 2004
6789644 Engine muffler Sep. 14, 2004
6467570 Spark arrester with spark filter Oct. 22, 2002
6296074 Noise reducing exhaust system and method Oct. 2, 2001
5996733 Dual frequency side branch resonator Dec. 7, 1999
5936210 High performance muffler Aug. 10, 1999
5925857 Inverted cone tuned exhaust system Jul. 20, 1999
5894115 Exhaust system apparatus and noise suppression method Apr. 13, 1999
5783780 Sound absorption structure Jul. 21, 1998
5773770 Cross flow path exhaust muffler Jun. 30, 1998
5739484 Exhaust muffler Apr. 14, 1998
5602368 Muffler for an internal combustion engine Feb. 11, 1997

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