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Class Information
Number: 181/248
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Straight-through passage > Continuous conduit
Description: Subject matter wherein the passage is comprised of a continuous uninterrupted conduit from its inlet to the outlet.










Sub-classes under this class:

Class Number Class Name Patents
181/249 With expansion chamber 150


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8634574 Sound transmitting device Jan. 21, 2014
8550122 Exhaust finisher retention operation Oct. 8, 2013
8297404 Soundproof exhaust pipe for a turbine engine Oct. 30, 2012
8136628 Exhaust system for motorcycle Mar. 20, 2012
7992676 Compact tuned acoustic attenuation device Aug. 9, 2011
7971432 Flow diffuser for exhaust pipe Jul. 5, 2011
7905319 Venturi muffler Mar. 15, 2011
7878298 Fuel-cell exhaust system Feb. 1, 2011
7861824 Sound absorber for an exhaust system Jan. 4, 2011
7819222 Device and method for attenuating energy along a conduit Oct. 26, 2010
7703573 Ported aerodynamic exhaust tailpipe Apr. 27, 2010
7677357 Muffler and vehicle equipped with muffler Mar. 16, 2010
7581563 Exhaust pipe with profiled inner tube, and method of making an exhaust pipe Sep. 1, 2009
7497301 Tubular acoustic silencer Mar. 3, 2009
7487857 Sonic coupling between an intake tract or engine compartment and the interior of a motor vehicle Feb. 10, 2009
7380397 Automobile exhaust pipe assembly Jun. 3, 2008
7364011 Attenuating power booster Apr. 29, 2008
7278514 Acoustic noise filter Oct. 9, 2007
7249652 Fluid guideline, especially in the form of a tube for taking up untreated air in an air filter of a motor vehicle Jul. 31, 2007
7086497 Induction system with low pass filter for turbo charger applications Aug. 8, 2006
7063134 Combined muffler/heat exchanger Jun. 20, 2006
7032589 Portable ventilator Apr. 25, 2006
7017706 Turbine noise absorber Mar. 28, 2006
6913112 Noise attenuation assembly Jul. 5, 2005
6892855 Embossed shell for spun mufflers May. 17, 2005
6868939 Exhaust silencer system Mar. 22, 2005
6840746 Resistive suction muffler for refrigerant compressors Jan. 11, 2005
6799657 Absorptive/reactive muffler for variable speed compressors Oct. 5, 2004
6752240 Sound attenuator for a supercharged marine propulsion device Jun. 22, 2004
6739426 Low-noise pressure reduction system May. 25, 2004
6668972 Bumper/muffler assembly Dec. 30, 2003
6622818 Sound attenuating device Sep. 23, 2003
6530452 Reactive silencer for industrial air channels and its use Mar. 11, 2003
6520287 Methods and systems for low temperature cleaning of diesel exhaust and other incomplete combustion products of carbon-containing fuels Feb. 18, 2003
6457552 Methods and apparatus for low back pressure muffling of internal combustion engines Oct. 1, 2002
6223434 Muffler and its manufacturing method May. 1, 2001
6109387 Silencer for gas discharge devices Aug. 29, 2000
5804778 Elevator control data intercommunication programmer Sep. 8, 1998
5198625 Exhaust muffler for internal combustion engines Mar. 30, 1993
5171944 Pressure pulsation absorbing device Dec. 15, 1992
5162622 Exhaust silencer Nov. 10, 1992
5151254 Exhaust gas cleaning device for internal combustion engine Sep. 29, 1992
4541240 Exhaust system for internal combustion engines Sep. 17, 1985
RE31275 Zeno duct sound attenuating means Jun. 14, 1983
4325459 Muffler diffuser Apr. 20, 1982
4314621 Fluidborne noise attenuator Feb. 9, 1982
4252212 Muffler for combustion engines Feb. 24, 1981
4239091 Muffler Dec. 16, 1980
4211302 Sound absorbing device Jul. 8, 1980
4211304 Sound absorbing device Jul. 8, 1980

1 2










 
 
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