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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
6607052 Muffler shell filling process and muffler filled with fibrous material Aug. 19, 2003
6585078 Muffler insert Jul. 1, 2003
6581723 Muffler shell filling process, muffler filled with fibrous material and vacuum filling device Jun. 24, 2003
6558137 Reciprocating piston compressor having improved noise attenuation May. 6, 2003
6543576 Multiple layer fiber filled sound absorber and a method of manufacturing the same Apr. 8, 2003
6520286 Silencer and a method of operating a vehicle Feb. 18, 2003
6467569 Spark arresting muffler with exhaust path parallel to muffler centerline Oct. 22, 2002
6467571 Sound absorbing material, muffler using the sound absorbing material, and method for forming sound absorbing layer thereof Oct. 22, 2002
6457550 Weatherproof sound attenuating device Oct. 1, 2002
6446750 Process for filling a muffler shell with fibrous material Sep. 10, 2002
6435302 Motor vehicle muffler Aug. 20, 2002
6412596 Process for filling a muffler and muffler filled with fibrous material Jul. 2, 2002
6394225 Muffler structure May. 28, 2002
6382347 Exhaust muffler for an internal combustion engine May. 7, 2002
6374944 Silencer with internal rain diverter Apr. 23, 2002
6354398 Mufflers for use with engine retarders; and methods Mar. 12, 2002
6343673 Turbine exhaust structure for vehicle Feb. 5, 2002
6332510 Gas flow silencer Dec. 25, 2001
6315076 Catalytic converter for a muffler of a small engine Nov. 13, 2001
6279613 Energy attenuation apparatus for a system conveying liquid under pressure and method of attenuating energy in such a system Aug. 28, 2001
6269841 Energy attenuation apparatus for a system conveying liquid under pressure and method of attenuating energy in such a system Aug. 7, 2001
6241043 Muffler insert and process for the production thereof Jun. 5, 2001
6202785 Muffler with acoustic absorption insert for limited clearance pneumatic device applications Mar. 20, 2001
6196351 Silencer cartridge Mar. 6, 2001
6161646 Turbo-generator exhaust noise silencer Dec. 19, 2000
6158547 Process for manufacturing an absorption muffler Dec. 12, 2000
6155379 Silencing member for mufflers and method of manufacturing the silencing member Dec. 5, 2000
6152260 Method of filling cavities in workpieces or semi-finished products and structural components parts for mounting on or in a motor vehicle Nov. 28, 2000
6148955 Silencer Nov. 21, 2000
6138791 Muffler sleeve, and method and apparatus for manufacturing same Oct. 31, 2000
6123108 Energy attenuation apparatus for a system conveying liquid under pressure and method of attenuating energy in such a system Sep. 26, 2000
6116376 Structure of a muffler Sep. 12, 2000
6109387 Silencer for gas discharge devices Aug. 29, 2000
6089348 Blower noise silencer Jul. 18, 2000
6082488 Muffler for vehicles Jul. 4, 2000
6082487 Mufflers for use with engine retarders; and methods Jul. 4, 2000
6068082 Muffler packing method and apparatus May. 30, 2000
5992560 Muffler for internal combustion engine Nov. 30, 1999
5962821 Internal combustion engine noise reduction apparatus Oct. 5, 1999
5953787 Suction globe of a vacuum cleaner Sep. 21, 1999
5934959 Marine muffler Aug. 10, 1999
5936210 High performance muffler Aug. 10, 1999
5912441 Absorption/reflection exhaust muffler Jun. 15, 1999
5892186 Muffler with gas-dispersing shell and sound-absorption layers Apr. 6, 1999
5869793 Oval shaped spark arresting muffler for engines Feb. 9, 1999
5844178 Resonance muffler Dec. 1, 1998
5783782 Multi-chamber muffler with selective sound absorbent material placement Jul. 21, 1998
5777947 Apparatuses and methods for sound absorption using hollow beads loosely contained in an enclosure Jul. 7, 1998
5765257 Muffler Jun. 16, 1998
5696361 Multi-ducts sound eliminator for air pipe Dec. 9, 1997

1 2 3 4 5 6










 
 
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