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Class Information
Number: 181/226
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With adjustable fluid flow
Description: Subject matter wherein there is provided some means for varying the fluid flow while attenuating and diffusing the sounds normally produced by moving fluids.

Patents under this class:

Patent Number Title Of Patent Date Issued
7779962 Muffler Aug. 24, 2010
7686130 Dual mode vehicle exhaust system and associated method Mar. 30, 2010
7533760 Noise reduction tubes May. 19, 2009
7497300 Noise reduction tubes Mar. 3, 2009
6719078 Ventilable silencer unit for vehicles Apr. 13, 2004
6708798 Easily controlled exhaust pipe Mar. 23, 2004
6705428 Exhaust gas system with helmholtz resonator Mar. 16, 2004
6637545 Silencer Oct. 28, 2003
6637449 Pressure sensible valve for exhaust muffler and method of assembling same Oct. 28, 2003
6367580 Sound adjustable tail pipe structure Apr. 9, 2002
5744762 Muffler controller for use in controllable exhaust system of internal combustion engine Apr. 28, 1998
5712454 Exhaust system in internal combustion engine Jan. 27, 1998
5655367 Inlet or exhaust line for a reciprocating machine Aug. 12, 1997
5283398 Resonator type silencer Feb. 1, 1994
5210382 Belleville washer spring type pulsation damper, noise attenuator and accumulator May. 11, 1993
5137439 Screw rotor machine with De Laval nozzle for noise reduction Aug. 11, 1992
5003781 Air supply and exhaust control systems for turbocharged internal combustion engines Apr. 2, 1991
4969536 Turbocharger noise silencer Nov. 13, 1990
4949413 Low air loss bed Aug. 21, 1990
4699244 Exhaust silencer device for an internal combustion engine Oct. 13, 1987
4665692 Engine exhaust control system May. 19, 1987
4609068 Exhaust accessory unit for internal combustion engines Sep. 2, 1986
4327815 Rotational mechanism disposed within fluid passageway May. 4, 1982
4320815 Noise reduction in engine exhaust Mar. 23, 1982
4316523 Silencer for gas discharge devices Feb. 23, 1982
4294283 Wedge sealed damper Oct. 13, 1981
4226298 Exhaust device for internal combustion engines Oct. 7, 1980

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