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Class Information
Number: 181/258
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With sound absorbing material > Pervious material interposed in flow path
Description: Subject matter wherein the sound absorbing material is directly in the flow path of the moving fluid, and the fluid must pass through the material to its exit.










Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8701824 Muffler for small-sized vehicle Apr. 22, 2014
8511427 Blower arrangement Aug. 20, 2013
8505682 Lightweight polymeric exhaust components Aug. 13, 2013
8485153 Air intake apparatus Jul. 16, 2013
8397863 Muffler with a built-in heat exchanger Mar. 19, 2013
8307944 Muffler Nov. 13, 2012
8307943 High pressure drop muffling system Nov. 13, 2012
8307948 Silencer device for a hair dryer Nov. 13, 2012
8210307 Sonic absorption device for an air pipeline of an aircraft, in particular of an air conditioning system of an aircraft Jul. 3, 2012
8191675 Silencer Jun. 5, 2012
8181671 Anti-resonant pulse diffuser May. 22, 2012
8172038 Silencer for a motor device May. 8, 2012
8146708 Muffler with integrated catalytic converter and polymeric muffler body Apr. 3, 2012
8087492 Methods and systems for integrating sound attenuation into a filter bank Jan. 3, 2012
8020663 Method for reducing the noise generated by a hole under a high energy gas flow Sep. 20, 2011
8011470 Compressor silencer for hyperbaric oxygen therapy system Sep. 6, 2011
8002081 Exhaust system for combustion engine Aug. 23, 2011
7942238 Marine muffler with angularly disposed internal baffle May. 17, 2011
7931120 Exhaust device and vehicle with exhaust device Apr. 26, 2011
7905321 Inserts for engine exhaust systems Mar. 15, 2011
7878298 Fuel-cell exhaust system Feb. 1, 2011
7849705 Noise reduction device and air conditioner having the same Dec. 14, 2010
7753167 Silencer Jul. 13, 2010
7730997 Air intake noise reducing device, internal combustion engine fitted with the same and structure for fitting the same to the internal combustion engine Jun. 8, 2010
7631726 Silencer for air induction system and high flow articulated coupling Dec. 15, 2009
7527774 Inlet metallic foam support coupled to precious metal catalyst for application on 4 stroke platforms May. 5, 2009
7484590 Fuel cell system with muffler Feb. 3, 2009
7464789 Exhaust silencer for internal combustion engine Dec. 16, 2008
7438157 Muffler for an exhaust gas system Oct. 21, 2008
7407037 Exhaust silencer for internal combustion engine Aug. 5, 2008
7407036 Muffler for compact combustion engines Aug. 5, 2008
7380638 Exhaust noise control for motorcycles Jun. 3, 2008
7350349 Method and device of a particle filter for an exhaust system, silencer including such a device, and a combustion engine driven vehicle Apr. 1, 2008
7325474 Silencer Feb. 5, 2008
7281606 Exhaust sound and emission control systems Oct. 16, 2007
7191849 Pneumatic tool Mar. 20, 2007
7156202 Method and apparatus for venting exhaust gas from an engine Jan. 2, 2007
7062908 Construction for exhaust emission control Jun. 20, 2006
7011179 Auxiliary heater arrangement with a muffler Mar. 14, 2006
6991043 Pneumatic tool Jan. 31, 2006
6978605 Exhaust emission control system for engine Dec. 27, 2005
6935460 Noise muffler for oxygen concentrator Aug. 30, 2005
6932188 Silencer for vacuum cleaner Aug. 23, 2005
6913112 Noise attenuation assembly Jul. 5, 2005
6902030 Sound muffling apparatus for air operated equipment Jun. 7, 2005
6892854 Muffler with catalytic converter arrangement; and method May. 17, 2005
6837335 Replaceable catalyst for exhaust system Jan. 4, 2005
6837336 Apparatus for treating a gas stream Jan. 4, 2005
6739426 Low-noise pressure reduction system May. 25, 2004
6668971 Pneumatic hand tool exhaust muffler having inner and outer tubes Dec. 30, 2003

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