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Class Information
Number: 181/241
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Adjustable muffler (i.e., internal or external parts)
Description: Subject matter wherein two or more of the internal parts of external casing sections can be repositioned relative to each other to change the size of the muffler.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8479879 Expandable chamber acoustic silencer Jul. 9, 2013
8444397 Manual selective attenuator May. 21, 2013
8434590 Muffler May. 7, 2013
8322134 Sliding fit, pipe arrangement and exhaust gas treatment device Dec. 4, 2012
8316813 Engine assembly having variable intake air tuning device and tuning method Nov. 27, 2012
8302393 Exhaust system of an internal combustion engine Nov. 6, 2012
8286751 Muffling device Oct. 16, 2012
8220587 Silencer cover for saddle-ride type vehicle Jul. 17, 2012
8123498 Tunable choke tube for pulsation control device used with gas compressor Feb. 28, 2012
8091683 Motorcycle Jan. 10, 2012
8079441 Muffler Dec. 20, 2011
8068575 Acoustic load mitigator Nov. 29, 2011
8033359 Intake sound adjusting device Oct. 11, 2011
8002080 Removable exhaust baffle Aug. 23, 2011
7971681 Exhaust-gas muffler Jul. 5, 2011
7946382 Gas compressor with side branch absorber for pulsation control May. 24, 2011
7946383 Acoustic load mitigator May. 24, 2011
7938226 Exhaust system for internal combustion engine having temperature variable acoustics May. 10, 2011
7934375 Vehicle exhaust systems May. 3, 2011
7905321 Inserts for engine exhaust systems Mar. 15, 2011
7896128 Auto-sensing, automatic adjusting exhaust baffle Mar. 1, 2011
7779822 Intake assembly with integral resonators Aug. 24, 2010
7757808 Noise reduction system Jul. 20, 2010
7690478 Continuously variable tuned resonator Apr. 6, 2010
7686130 Dual mode vehicle exhaust system and associated method Mar. 30, 2010
7584821 Adjustable helmholtz resonator Sep. 8, 2009
7533760 Noise reduction tubes May. 19, 2009
7510051 Switchable loud and quiet exhaust apparatus Mar. 31, 2009
7497300 Noise reduction tubes Mar. 3, 2009
7487857 Sonic coupling between an intake tract or engine compartment and the interior of a motor vehicle Feb. 10, 2009
7484591 Muffler outlet part for a motorcycle muffler Feb. 3, 2009
7451854 Exhaust flow rate control valve Nov. 18, 2008
7428947 Electrically controlled in-muffler exhaust valve for use during cylinder deactivation Sep. 30, 2008
7416051 Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes Aug. 26, 2008
7350619 Auxiliary power unit exhaust duct with muffler incorporating an externally replaceable acoustic liner Apr. 1, 2008
7328586 Repositionable attenuator Feb. 12, 2008
7261181 Detatchable muffler apparatus for pneumatic tools Aug. 28, 2007
7234297 Motorcycle exhaust enhancers Jun. 26, 2007
7100736 Serviceable muffler Sep. 5, 2006
7055648 Assembly and method for fan noise reduction from turbofan engines using dynamically adaptive Herschel-Quincke tubes Jun. 6, 2006
7051523 Exhaust system assemblies employing wire bushings for thermal compensation May. 30, 2006
7021052 Motorcycle exhaust control system Apr. 4, 2006
6968922 Exhaust apparatus for vehicle Nov. 29, 2005
6968710 Refrigeration compressor capacity limiting device Nov. 29, 2005
6941751 Exhaust muffler and muffler system for use with an internal combustion engine Sep. 13, 2005
6938729 Exhaust gas system Sep. 6, 2005
6932189 Device for noise structuring in a motor vehicle Aug. 23, 2005
6915876 Exhaust processor with variable tuning system Jul. 12, 2005
6901752 Exhaust processor with variable tuning system and method of operating such exhaust processor Jun. 7, 2005
6848252 Exhaust enhancement for aftermarket motorcycle exhaust pipes with a straight pipe type design and with inside pipe diameter from 1.875" and larger Feb. 1, 2005

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