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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
7631726 Silencer for air induction system and high flow articulated coupling Dec. 15, 2009
7601191 Apparatus for venting a transmission case Oct. 13, 2009
7552797 Vehicular exhaust system Jun. 30, 2009
7549510 Vehicle exhaust system Jun. 23, 2009
7546899 Lightweight polymer muffler apparatus and method of making same Jun. 16, 2009
7536821 Cartridge casing catcher with reduced firearm ejection port flash and noise May. 26, 2009
7530427 Exhaust deflector for a muffler May. 12, 2009
7530428 Exhaust deflector for a muffler May. 12, 2009
7472774 Versatile engine muffling system Jan. 6, 2009
7464789 Exhaust silencer for internal combustion engine Dec. 16, 2008
7431125 Composite muffler for use with airborne auxiliary power unit Oct. 7, 2008
7424931 Muffler for a motorcycle Sep. 16, 2008
7416050 Gas expansion silencer Aug. 26, 2008
7407037 Exhaust silencer for internal combustion engine Aug. 5, 2008
7383919 Rotatable propeller driven engine exhaust system Jun. 10, 2008
7380639 Backpressure reducing exhaust system with stationary blade structure Jun. 3, 2008
7380397 Automobile exhaust pipe assembly Jun. 3, 2008
7364011 Attenuating power booster Apr. 29, 2008
7350620 Compact silencer Apr. 1, 2008
7281605 Mufflers with enhanced acoustic performance at low and moderate frequencies Oct. 16, 2007
7278514 Acoustic noise filter Oct. 9, 2007
7273129 Muffler with internal heat shield Sep. 25, 2007
7261181 Detatchable muffler apparatus for pneumatic tools Aug. 28, 2007
7216739 Muffler for pneumatic hand tool May. 15, 2007
7185678 Orifice plate diffuser Mar. 6, 2007
7165648 Method for containing an acoustical material within an assembly Jan. 23, 2007
7141101 Filter assembly with noise attenuation Nov. 28, 2006
7100737 Muffler for noise reduction Sep. 5, 2006
7017706 Turbine noise absorber Mar. 28, 2006
7011180 System for filtering ultrasonic noise within a fluid flow system Mar. 14, 2006
7004283 Multiple-chambered exhaust muffler Feb. 28, 2006
6935460 Noise muffler for oxygen concentrator Aug. 30, 2005
6920959 Inlet and outlet duct units for air supply fan Jul. 26, 2005
6900145 Trim panel insulator for a vehicle May. 31, 2005
6899198 Compressed air muffler May. 31, 2005
6880670 Muffler for suction system exhaust air used with an automatic cutting machine Apr. 19, 2005
6868939 Exhaust silencer system Mar. 22, 2005
6857502 Engine muffler and method of manufacturing the same Feb. 22, 2005
6851514 Outlet silencer and heat recovery structures for gas turbine Feb. 8, 2005
6848476 Tuning cable Feb. 1, 2005
6840348 Exhaust muffler Jan. 11, 2005
6799657 Absorptive/reactive muffler for variable speed compressors Oct. 5, 2004
6789644 Engine muffler Sep. 14, 2004
6722467 Noise attenuator for an air supply system of an internal combustion engine Apr. 20, 2004
6702880 Inlet silencer/filter for an oxygen concentrator Mar. 9, 2004
6681889 Exhaust muffler for a fuel-operated heating device Jan. 27, 2004
6672424 Acoustically treated turbomachine multi-duct exhaust device Jan. 6, 2004
6668972 Bumper/muffler assembly Dec. 30, 2003
6668971 Pneumatic hand tool exhaust muffler having inner and outer tubes Dec. 30, 2003
6629580 Perforated end pipe of silencer unit Oct. 7, 2003

1 2 3 4 5 6










 
 
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