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Class Information
Number: 181/279
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With baffle or baffle structure > Spiral
Description: Subject matter in which the baffles are arranged to guide the moving fluid through an axially or radially expanding, circular path.










Sub-classes under this class:

Class Number Class Name Patents
181/280 Helical 55


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8689933 Helmholtz resonator for a gas turbine combustion chamber Apr. 8, 2014
8602159 Compact muffler for small two-stroke internal combustion engines Dec. 10, 2013
8381870 Fluid flow controller Feb. 26, 2013
8312962 Sound absorber having helical fixtures Nov. 20, 2012
8307945 Gas-turbine exhaust cone Nov. 13, 2012
8104572 Spin muffler Jan. 31, 2012
8061476 Sound dampening flow channel device Nov. 22, 2011
7726444 Exhaust system baffle apparatus Jun. 1, 2010
7721845 Exhaust muffler May. 25, 2010
7661509 Devices for regulating pressure and flow pulses Feb. 16, 2010
7644804 Sound attenuator Jan. 12, 2010
7600607 Flow-through sound-cancelling mufflers Oct. 13, 2009
7562742 Air exhaust/inlet sound attenuation mechanism Jul. 21, 2009
7484590 Fuel cell system with muffler Feb. 3, 2009
7383919 Rotatable propeller driven engine exhaust system Jun. 10, 2008
7380635 Interference-based exhaust noise attenuation Jun. 3, 2008
7380639 Backpressure reducing exhaust system with stationary blade structure Jun. 3, 2008
7374017 Exhaust system baffling apparatus May. 20, 2008
7350620 Compact silencer Apr. 1, 2008
7331422 Vortex muffler Feb. 19, 2008
7310942 Exhaust passage control valve Dec. 25, 2007
7303047 Apparatus for filtering ultrasonic noise within a fluid flow system Dec. 4, 2007
7303048 Method for filtering ultrasonic noise within a fluid flow system Dec. 4, 2007
7284638 Loudspeaker low profile quarter wavelength transmission line and enclosure and method Oct. 23, 2007
7117973 Noise suppressor apparatus for a gas duct Oct. 10, 2006
7073626 Engine exhaust muffler with guide vanes imparting a successively alternating spiral swirl gas flow Jul. 11, 2006
7011180 System for filtering ultrasonic noise within a fluid flow system Mar. 14, 2006
6959782 Tuned exhaust system for small engines Nov. 1, 2005
6796403 Exhaust system baffling apparatus Sep. 28, 2004
6588545 Muffler for internal combustion engine Jul. 8, 2003
6554100 Vehicle muffler system Apr. 29, 2003
6510921 Muffler/exhaust extractor Jan. 28, 2003
6385967 Exhaust pipe for motor vehicle muffler May. 14, 2002
6364055 Acoustically non-resonant pipe Apr. 2, 2002
6343673 Turbine exhaust structure for vehicle Feb. 5, 2002
6338246 Exhaust passage control valve Jan. 15, 2002
6253873 Gas guide element with sound-absorbent walls for blocking and damping noise spreading from it into main conduits Jul. 3, 2001
6213251 Self-tuning exhaust muffler Apr. 10, 2001
6167699 Secondary air injection system for an internal combustion engine Jan. 2, 2001
6089348 Blower noise silencer Jul. 18, 2000
5971097 Muffler for motor vehicles Oct. 26, 1999
5872342 Free rotor muffler Feb. 16, 1999
5824972 Acoustic muffler Oct. 20, 1998
5756944 Filter muffler May. 26, 1998
5558492 Paint sprayer with inlet silencer Sep. 24, 1996
5423395 Quieted air compressor Jun. 13, 1995
5248858 Automotive muffler and dust catcher assembly Sep. 28, 1993
5145026 Water faucet silencer apparatus Sep. 8, 1992
5129792 Refrigerant compressor having gas pulsation suppression device Jul. 14, 1992
4662474 Noise suppressor for pneumatic tool May. 5, 1987

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