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Class Information
Number: 181/232
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Separate distinct units serially connected
Description: Subject matter provided with a plurality of sound attenuating devices, each either of duplicate or different design and connected one after the other in the down-stream direction.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8517057 Pump installations Aug. 27, 2013
8511428 Noise attenuator and vehicle air intake duct provided therewith Aug. 20, 2013
8322134 Sliding fit, pipe arrangement and exhaust gas treatment device Dec. 4, 2012
8323001 Hermetic compressor Dec. 4, 2012
8210309 Channeling gas flow tube Jul. 3, 2012
8196703 Exhaust component Jun. 12, 2012
8136627 Exhaust silencer device for internal combustion engine Mar. 20, 2012
7905319 Venturi muffler Mar. 15, 2011
7896130 Snap action valve with inertia damper Mar. 1, 2011
7784586 Noise reduction structure for hybrid vehicle Aug. 31, 2010
7669694 Muffler for vehicle Mar. 2, 2010
7650965 Exhaust system Jan. 26, 2010
7628250 Passive valve assembly for vehicle exhaust system Dec. 8, 2009
7416050 Gas expansion silencer Aug. 26, 2008
7380572 Energy attenuation apparatus for a conduit conveying liquid under pressure, system incorporating same, and method of attenuating energy in a conduit Jun. 3, 2008
7325570 Method and apparatus for noise suppression in a fluid line Feb. 5, 2008
7325474 Silencer Feb. 5, 2008
7303047 Apparatus for filtering ultrasonic noise within a fluid flow system Dec. 4, 2007
7021420 System and method for phased noise attenuation Apr. 4, 2006
7011180 System for filtering ultrasonic noise within a fluid flow system Mar. 14, 2006
7007718 Energy attenuation apparatus for a conduit conveying liquid under pressure, system incorporating same, and method of attenuating energy in a conduit Mar. 7, 2006
6983820 Noise and vibration suppressors Jan. 10, 2006
6938729 Exhaust gas system Sep. 6, 2005
6926117 Muffler for pneumatic hand tool Aug. 9, 2005
6880670 Muffler for suction system exhaust air used with an automatic cutting machine Apr. 19, 2005
6802387 Muffler with external water trap Oct. 12, 2004
6755279 Controllable muffler system for internal combustion engine Jun. 29, 2004
6722467 Noise attenuator for an air supply system of an internal combustion engine Apr. 20, 2004
6675933 Exhaust system for motorcycle Jan. 13, 2004
6644436 Device for noise configuration in a motor vehicle Nov. 11, 2003
6454047 System and method for phases noise attenuation Sep. 24, 2002
6382348 Twin muffler May. 7, 2002
6338363 Energy attenuation device for a conduit conveying liquid under pressure, system incorporating same, and method of attenuating energy in a conduit Jan. 15, 2002
6290557 Exhaust system for jet propulsion boat Sep. 18, 2001
6167984 Device and a method for sound reduction in a transport system for gaseous medium and use of the device in an exhaust system for ships Jan. 2, 2001
6073656 Energy attenuation device for a conduit conveying liquid under pressure, system incorporating same, and method of attenuating energy in a conduit Jun. 13, 2000
6050362 Exhaust system with seamed roll joints and method for manufacture Apr. 18, 2000
5726397 Vehicle exhaust device Mar. 10, 1998
5679916 Gun silencer Oct. 21, 1997
5493080 External arrangement for damping sounds in a pipe system Feb. 20, 1996
5444196 In line insertion muffler for marine engines Aug. 22, 1995
5426269 Muffler with catalytic converter arrangement; and method Jun. 20, 1995
5367131 Apparatus for treating hydrocarbon and carbon monoxide gases Nov. 22, 1994
5355973 Muffler with catalytic converter arrangement; and method Oct. 18, 1994
5262600 In-line insertion muffler for marine engines Nov. 16, 1993
5245140 Muffler Sep. 14, 1993
5206467 Muffler with a catalyst Apr. 27, 1993
5137432 Noise-preventative aquarium pump Aug. 11, 1992
5101886 Combination power and heat unit Apr. 7, 1992
5045005 Marine engine exhaust system and method Sep. 3, 1991

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