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Class Information
Number: 181/256
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With sound absorbing material
Description: Subject matter having acoustic wave attenuating material positioned to be contacted by the moving fluid, as by surrounding or being positioned adjacent to and communicating with the fluid passage.










Sub-classes under this class:

Class Number Class Name Patents
181/257 And multi-passage 76
181/258 Pervious material interposed in flow path 185


Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8667949 Engine driven power generator apparatus Mar. 11, 2014
8640821 Exhaust system of engine Feb. 4, 2014
8636103 Muffler for vehicle Jan. 28, 2014
8602159 Compact muffler for small two-stroke internal combustion engines Dec. 10, 2013
8602157 Q4 muffler assembly Dec. 10, 2013
8590155 Apparatus for and process of filling a muffler with fibrous material utilizing a directional jet Nov. 26, 2013
8579077 Horizontally installed muffler having sporty tone Nov. 12, 2013
8522828 Insulated double-walled exhaust system component and method of making the same Sep. 3, 2013
8474250 Device and method for the reduction of emissions Jul. 2, 2013
8469143 Baffle with enhanced acoustic damping properties Jun. 25, 2013
8443933 Tubular acoustic insulating element May. 21, 2013
8408359 Acoustic attenuation method based on acoustic ray deflection theory and a muffler Apr. 2, 2013
8336301 Exhaust gas treatment unit Dec. 25, 2012
8336673 Muffler, muffler insert, and methods and apparatus for making Dec. 25, 2012
8328532 Compressor muffler Dec. 11, 2012
8307944 Muffler Nov. 13, 2012
8297404 Soundproof exhaust pipe for a turbine engine Oct. 30, 2012
8256569 Exhaust sound attenuation device and method of use Sep. 4, 2012
8215448 Sound damper for vehicle compressed air systems Jul. 10, 2012
8196702 Muffler for vehicle Jun. 12, 2012
8191581 Wire tube structure for exhaust component Jun. 5, 2012
8172039 Muffler for vehicle May. 8, 2012
8136628 Exhaust system for motorcycle Mar. 20, 2012
8132645 Attenuation device particularly pulsation attenuator Mar. 13, 2012
8109362 Passive noise attenuation system Feb. 7, 2012
8042649 Vehicular muffler and motorcycle incorporating same Oct. 25, 2011
8043690 Exhaust washed structure and associated composite structure and method of fabrication Oct. 25, 2011
8020663 Method for reducing the noise generated by a hole under a high energy gas flow Sep. 20, 2011
8006801 Noise damper for a compressed air device Aug. 30, 2011
8002081 Exhaust system for combustion engine Aug. 23, 2011
7997382 Exhaust device for straddle-type vehicle and straddle-type vehicle Aug. 16, 2011
7997383 Vehicle exhaust system Aug. 16, 2011
7988427 Compressor muffler Aug. 2, 2011
7942237 Long fiber thermoplastic composite muffler system with integrated reflective chamber May. 17, 2011
7942236 Exhaust device for straddle-type vehicle and straddle-type vehicle May. 17, 2011
7934580 Long fiber thermoplastic composite muffler system May. 3, 2011
7896129 Sub-muffler Mar. 1, 2011
7891326 Engine exhaust system Feb. 22, 2011
7882929 Delivery pipe Feb. 8, 2011
7878298 Fuel-cell exhaust system Feb. 1, 2011
7849705 Noise reduction device and air conditioner having the same Dec. 14, 2010
7810609 Muffler Oct. 12, 2010
7806228 Single duct silencing terminal unit Oct. 5, 2010
7789194 Acoustic attenuation chamber Sep. 7, 2010
7753167 Silencer Jul. 13, 2010
7753979 Filter assembly with adjustable inlet opening Jul. 13, 2010
7735602 Muffler structure Jun. 15, 2010
7735604 Silencer of exhaust gases, in particular for motor vehicles Jun. 15, 2010
7730996 Long fiber thermoplastic composite muffler system with integrated crash management Jun. 8, 2010
7694778 Fuel cell vehicle Apr. 13, 2010

1 2 3 4 5 6










 
 
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