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Class Information
Number: 181/277
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With baffle or baffle structure > Movable baffle
Description: Subject matter having baffles constantly in motion, and driven either under the force of the moving fluid or by some external means.










Sub-classes under this class:

Class Number Class Name Patents
181/278 Biased 29


Patents under this class:

Patent Number Title Of Patent Date Issued
8675357 Data center aisle containment system utilizing a movable sash that is integral to the computer rack cabinet Mar. 18, 2014
8286751 Muffling device Oct. 16, 2012
8248792 Container data center and air intake apparatus Aug. 21, 2012
7971681 Exhaust-gas muffler Jul. 5, 2011
7971432 Flow diffuser for exhaust pipe Jul. 5, 2011
7584821 Adjustable helmholtz resonator Sep. 8, 2009
7581619 Movable baffle columns for use with air handling units Sep. 1, 2009
7497300 Noise reduction tubes Mar. 3, 2009
7484591 Muffler outlet part for a motorcycle muffler Feb. 3, 2009
7428947 Electrically controlled in-muffler exhaust valve for use during cylinder deactivation Sep. 30, 2008
7357220 Systems and methods for controlling acoustical damping Apr. 15, 2008
7337877 Variable geometry resonator for acoustic control Mar. 4, 2008
7325474 Silencer Feb. 5, 2008
7278514 Acoustic noise filter Oct. 9, 2007
7258196 Noise attenuator with laterally moving baffles Aug. 21, 2007
7117974 Electronically controlled dual chamber variable resonator Oct. 10, 2006
7055648 Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes Jun. 6, 2006
6941751 Exhaust muffler and muffler system for use with an internal combustion engine Sep. 13, 2005
6915876 Exhaust processor with variable tuning system Jul. 12, 2005
6810992 Sound producing vehicle exhaust system Nov. 2, 2004
6732510 Exhaust processor with variable tuning system May. 11, 2004
6732509 Engine acoustical system May. 11, 2004
6634457 Apparatus for damping acoustic vibrations in a combustor Oct. 21, 2003
6622819 Sound attenuator for pneumatic exhaust Sep. 23, 2003
6609590 Exhaust system having angled baffle Aug. 26, 2003
6554100 Vehicle muffler system Apr. 29, 2003
6508331 Variable resonator Jan. 21, 2003
6367580 Sound adjustable tail pipe structure Apr. 9, 2002
6343673 Turbine exhaust structure for vehicle Feb. 5, 2002
6167699 Secondary air injection system for an internal combustion engine Jan. 2, 2001
6050284 RV generator auxiliary exhaust system method Apr. 18, 2000
5884666 Exhaust pipe extension Mar. 23, 1999
5872342 Free rotor muffler Feb. 16, 1999
5655367 Inlet or exhaust line for a reciprocating machine Aug. 12, 1997
5489753 Static dissipative muffler Feb. 6, 1996
5129792 Refrigerant compressor having gas pulsation suppression device Jul. 14, 1992
5074376 Noise reduction method Dec. 24, 1991
5027919 Fluid friction controller Jul. 2, 1991
4969536 Turbocharger noise silencer Nov. 13, 1990
4903486 Performance responsive muffler for internal combustion engines Feb. 27, 1990
4688472 Noise reduction spoiler for a damper Aug. 25, 1987
4616732 Silencing system for exhaust gases from internal combustion engines Oct. 14, 1986
4428453 Exhaust silences for internal combustion engines Jan. 31, 1984
4327815 Rotational mechanism disposed within fluid passageway May. 4, 1982
4236598 Rotating self-cleaning sound absorber for ducts Dec. 2, 1980
4226298 Exhaust device for internal combustion engines Oct. 7, 1980
4103702 Sound proofed valve for fluid under pressure Aug. 1, 1978











 
 
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