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Class Information
Number: 181/233
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Liquid motion silencer
Description: Subject matter wherein the fluid conducting attenuating device suppresses the transmission of sound waves or similar vibrations (fluid impulses) along pipes and conduits carrying fluids.










Sub-classes under this class:

Class Number Class Name Patents
181/234 Water-closet type 15


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8496087 Fitting system for a hydraulic tuning cable Jul. 30, 2013
8162102 Vacuum waste-water system sound-absorber Apr. 24, 2012
8132645 Attenuation device particularly pulsation attenuator Mar. 13, 2012
7984787 Fluid-carrying conduit and method with noise attenuation Jul. 26, 2011
7946381 Sound-absorbing device and its mounting method May. 24, 2011
7942238 Marine muffler with angularly disposed internal baffle May. 17, 2011
7905322 Marine muffler with angularly disposed internal baffle Mar. 15, 2011
7896403 Pipe/silencer device assembly Mar. 1, 2011
7819222 Device and method for attenuating energy along a conduit Oct. 26, 2010
7581620 Marine muffler with angularly disposed internal baffle Sep. 1, 2009
7445082 Noise suppressing device and installation structure of same Nov. 4, 2008
7347044 Exhaust water trap Mar. 25, 2008
7278514 Acoustic noise filter Oct. 9, 2007
7185736 Aerodynamic noise abatement device and method for air-cooled condensing systems Mar. 6, 2007
7114330 Vertical exhaust water trap assembly Oct. 3, 2006
7111831 Sound attenuation apparatus and method Sep. 26, 2006
7063181 Fluid-borne noise suppression in an automotive power steering system Jun. 20, 2006
7049501 Ring mute May. 23, 2006
7000728 Noise reducing fluid transfer hose, in particular for a motor vehicle power steering controlled system Feb. 21, 2006
6966401 Sound absorbing device for fuel tank Nov. 22, 2005
6948585 Acoustic wave attenuator for a rail Sep. 27, 2005
6938727 Integrated engine compartment component and air intake system Sep. 6, 2005
6905002 Acoustic wave attenuator for a rail Jun. 14, 2005
6868670 Compact, reduced backpressure, vertical exhaust water trap assembly Mar. 22, 2005
6840746 Resistive suction muffler for refrigerant compressors Jan. 11, 2005
6705842 Dynamic attenuator of discharge noise from rotary vacuum machines Mar. 16, 2004
6691823 Suction muffler in reciprocating compressor Feb. 17, 2004
6688423 Fluid-borne noise suppression Feb. 10, 2004
6655165 Air conditioner with power recovery device having a sound suppression device Dec. 2, 2003
5929396 Noise reducing diffuser Jul. 27, 1999
5831224 Noise reduction system for fluid cutting jets Nov. 3, 1998
5731557 Fluid guiding element for blocking and damping noise propagating in main passages Mar. 24, 1998
5728981 Power steering attenuation hose construction and method of making the same Mar. 17, 1998
5539164 Power steering attenuation hose construction and method of making the same Jul. 23, 1996
5521340 Tuned tube muffler for an automotive vehicle May. 28, 1996
5426270 Fluid noise muffler and method of manufacture Jun. 20, 1995
5210382 Belleville washer spring type pulsation damper, noise attenuator and accumulator May. 11, 1993
5171944 Pressure pulsation absorbing device Dec. 15, 1992
5145026 Water faucet silencer apparatus Sep. 8, 1992
5103929 Fluid noise muffler and method of manufacture Apr. 14, 1992
5101930 Hydraulic elevator muffler Apr. 7, 1992
4874016 Method for improving signal-to-noise ratios in fluidic circuits and apparatus adapted for use therewith Oct. 17, 1989
4768616 Acoustic filter Sep. 6, 1988
4763754 Hydraulic clatter damping device and its application to valves and the like Aug. 16, 1988
4763471 Exhaust plenum chamber Aug. 16, 1988
4742889 Phonic deadening device for conduit of sanitary installation May. 10, 1988
4671380 Hydraulic noise attenuators Jun. 9, 1987
4624415 Control assembly Nov. 25, 1986
4617962 Hydraulic device Oct. 21, 1986
4600076 Device for attenuating pulsation of fluids in piping systems Jul. 15, 1986

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