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Class Information
Number: 181/252
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Straight-through passage > With sound absorbing material
Description: Subject matter having acoustic wave attenuating material positioned within the fluid conducting device to be contacted by the exhaust fluid as by surrounding the through passage or being positioned adjacent to and communicating with the exhaust fluids.










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
8622168 Motorcycle exhaust system structure including a resonator provided to an exhaust pipe Jan. 7, 2014
8550210 Resonant-type muffler Oct. 8, 2013
8522828 Insulated double-walled exhaust system component and method of making the same Sep. 3, 2013
8485153 Air intake apparatus Jul. 16, 2013
8408359 Acoustic attenuation method based on acoustic ray deflection theory and a muffler Apr. 2, 2013
8397863 Muffler with a built-in heat exchanger Mar. 19, 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
8297404 Soundproof exhaust pipe for a turbine engine Oct. 30, 2012
8256569 Exhaust sound attenuation device and method of use Sep. 4, 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
8141679 Absorptive muffler suspension Mar. 27, 2012
8136628 Exhaust system for motorcycle Mar. 20, 2012
8136629 Silencer/muffler Mar. 20, 2012
8132552 Intake duct Mar. 13, 2012
8133037 External gear hydraulic pump with acoustical insulation Mar. 13, 2012
8132645 Attenuation device particularly pulsation attenuator Mar. 13, 2012
8127885 Method and apparatus for a loudspeaker assembly Mar. 6, 2012
8104571 External cylinder and silencer provided with the external cylinder Jan. 31, 2012
8087493 Sound absorber for a pipe-shaped, cavity-forming body Jan. 3, 2012
8083025 Silencer provided on exhaust pipe of vehicle engine Dec. 27, 2011
8066096 Inlet silencer Nov. 29, 2011
8043690 Exhaust washed structure and associated composite structure and method of fabrication Oct. 25, 2011
8042649 Vehicular muffler and motorcycle incorporating same 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
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
7905321 Inserts for engine exhaust systems Mar. 15, 2011
7896129 Sub-muffler Mar. 1, 2011
7882929 Delivery pipe Feb. 8, 2011
7878298 Fuel-cell exhaust system Feb. 1, 2011
7861825 Method and apparatus for a loudspeaker assembly Jan. 4, 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
7779963 Exhaust system for motorcycle Aug. 24, 2010
7753979 Filter assembly with adjustable inlet opening Jul. 13, 2010
7743883 Noise eliminator for fuel cell Jun. 29, 2010
7735602 Muffler structure Jun. 15, 2010

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