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Class Information
Number: 181/271
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With baffle or baffle structure > Expansion chamber type > With adjustable or flexible wall
Description: Subject matter wherein at least one of the partitions defining the chamber is repositionable with respect to another.










Patents under this class:

Patent Number Title Of Patent Date Issued
8479879 Expandable chamber acoustic silencer Jul. 9, 2013
8381871 Compact low frequency resonator Feb. 26, 2013
8230968 Suction muffler for hermetic compressor Jul. 31, 2012
8127888 Engine sound distribution apparatus for a motor vehicle Mar. 6, 2012
8068575 Acoustic load mitigator Nov. 29, 2011
7975802 Intake air sound generation device Jul. 12, 2011
RE42490 Device and method for amplifying suction noise Jun. 28, 2011
7934580 Long fiber thermoplastic composite muffler system May. 3, 2011
7845466 Sound generator with structurally and acoustically coupled sound radiation panel and method for manufacturing the same Dec. 7, 2010
7717230 Device and method for amplifying suction noise May. 18, 2010
7617909 Muffler Nov. 17, 2009
7581619 Movable baffle columns for use with air handling units Sep. 1, 2009
7533760 Noise reduction tubes May. 19, 2009
7497300 Noise reduction tubes Mar. 3, 2009
7487857 Sonic coupling between an intake tract or engine compartment and the interior of a motor vehicle Feb. 10, 2009
7416051 Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes Aug. 26, 2008
7357220 Systems and methods for controlling acoustical damping Apr. 15, 2008
7337877 Variable geometry resonator for acoustic control Mar. 4, 2008
7273130 Device and method for active soundproofing, and power unit for aeroplanes Sep. 25, 2007
7258196 Noise attenuator with laterally moving baffles Aug. 21, 2007
7188703 Device for establishing noise in a motor vehicle Mar. 13, 2007
7125198 Mobile work zone protection device Oct. 24, 2006
7055648 Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes Jun. 6, 2006
6932189 Device for noise structuring in a motor vehicle Aug. 23, 2005
6915876 Exhaust processor with variable tuning system Jul. 12, 2005
6902030 Sound muffling apparatus for air operated equipment Jun. 7, 2005
6732510 Exhaust processor with variable tuning system May. 11, 2004
6622821 Thin acoustic muffler exhaust pipes, method of sheet metal construction thereof, and exhaust systems which utilize such exhaust pipes for increased ground clearance on race cars Sep. 23, 2003
6581722 Acoustic absorber and sound-absorption method Jun. 24, 2003
5881555 Exhaust pressure pulsation control apparatus for marine propulsion system Mar. 16, 1999
5598479 Device for reducing tire/road surface noise Jan. 28, 1997
5183974 Gas pulsation attenuator for automotive air conditioning compressor Feb. 2, 1993
5103931 Exhaust silencing means for marine propulsion Apr. 14, 1992
5060697 Extruded buckling-resistant insertion mountable drain or venting hose for positioning in a hollow space of a motor vehicle body Oct. 29, 1991
5027919 Fluid friction controller Jul. 2, 1991
4341283 Sound suppression system Jul. 27, 1982











 
 
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