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Class Information
Number: 181/278
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With baffle or baffle structure > Movable baffle > Biased
Description: Subject matter having means tending to force the moving baffle toward a position to restrict flow of fluid.










Patents under this class:

Patent Number Title Of Patent Date Issued
8348013 Exhaust device of internal combustion engine Jan. 8, 2013
8033358 Noise controlled turbine engine with aircraft engine adaptive noise control tubes Oct. 11, 2011
8002080 Removable exhaust baffle Aug. 23, 2011
7661509 Devices for regulating pressure and flow pulses Feb. 16, 2010
7600607 Flow-through sound-cancelling mufflers Oct. 13, 2009
7497300 Noise reduction tubes Mar. 3, 2009
7464788 Apparatus for transmitting sound in a motor vehicle Dec. 16, 2008
7383919 Rotatable propeller driven engine exhaust system Jun. 10, 2008
7357220 Systems and methods for controlling acoustical damping Apr. 15, 2008
7337877 Variable geometry resonator for acoustic control Mar. 4, 2008
7310942 Exhaust passage control valve Dec. 25, 2007
7278514 Acoustic noise filter Oct. 9, 2007
7117974 Electronically controlled dual chamber variable resonator Oct. 10, 2006
6796403 Exhaust system baffling apparatus Sep. 28, 2004
6672425 Noise abatement module Jan. 6, 2004
6609590 Exhaust system having angled baffle Aug. 26, 2003
6554100 Vehicle muffler system Apr. 29, 2003
6167699 Secondary air injection system for an internal combustion engine Jan. 2, 2001
5921081 Motor vehicle muffler Jul. 13, 1999
5489753 Static dissipative muffler Feb. 6, 1996
4903486 Performance responsive muffler for internal combustion engines Feb. 27, 1990
4840030 Tail pipe structure of control type muffler Jun. 20, 1989
4699244 Exhaust silencer device for an internal combustion engine Oct. 13, 1987
4617962 Hydraulic device Oct. 21, 1986
4609068 Exhaust accessory unit for internal combustion engines Sep. 2, 1986
4484659 Device for modulating the flow of the gases in an internal combustion engine exhaust muffler Nov. 27, 1984
4320815 Noise reduction in engine exhaust Mar. 23, 1982
4161996 Exhaust muffler Jul. 24, 1979
3969895 Power control valve attachment for two cycle motorcycle type engine exhaust systems Jul. 20, 1976











 
 
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