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Class Information
Number: 181/270
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > With baffle or baffle structure > Expansion chamber type > With alternating partial baffles along the length of casing
Description: Subject matter wherein there is a plurality of partial barriers alternately spaced along the length of the muffler casing.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8607757 Intake manifold for preventing flow noise Dec. 17, 2013
8505682 Lightweight polymeric exhaust components Aug. 13, 2013
8479878 Channeling gas flow tube Jul. 9, 2013
8469142 Muffler assembly Jun. 25, 2013
8424635 Firearm suppressor with relationally-rotated spacers disposed between baffles Apr. 23, 2013
8256571 Frequency-modifying muffler Sep. 4, 2012
8181671 Anti-resonant pulse diffuser May. 22, 2012
8104572 Spin muffler Jan. 31, 2012
8100224 Suppressor with poly-conical baffles Jan. 24, 2012
8002080 Removable exhaust baffle Aug. 23, 2011
7934582 Engine silencing and vibration reduction system and method May. 3, 2011
7849680 Diesel particulate filter system for auxiliary power units Dec. 14, 2010
7770690 Double-flow exhaust system for an internal-combustion engine Aug. 10, 2010
7766123 Vehicle exhaust system Aug. 3, 2010
7730997 Air intake noise reducing device, internal combustion engine fitted with the same and structure for fitting the same to the internal combustion engine Jun. 8, 2010
7717229 Gas turbine exhaust sound suppressor and associated methods May. 18, 2010
7621373 Acoustic drain Nov. 24, 2009
7549511 Exhaust sound and emission control systems Jun. 23, 2009
7549512 Muffler for internal combustion engine Jun. 23, 2009
7389853 Muffler for an engine Jun. 24, 2008
7380639 Backpressure reducing exhaust system with stationary blade structure Jun. 3, 2008
7350620 Compact silencer Apr. 1, 2008
7308967 Sound suppressor Dec. 18, 2007
7281606 Exhaust sound and emission control systems Oct. 16, 2007
7243757 Exhaust muffler Jul. 17, 2007
7219764 Exhaust muffler May. 22, 2007
7131514 Noise attenuation device for a vehicle exhaust system Nov. 7, 2006
7086498 Noise attenuation device for a vehicle exhaust system Aug. 8, 2006
7086497 Induction system with low pass filter for turbo charger applications Aug. 8, 2006
6945355 Muffler arrangement for a flow duct Sep. 20, 2005
6935461 Exhaust sound and emission control systems Aug. 30, 2005
6902030 Sound muffling apparatus for air operated equipment Jun. 7, 2005
6892851 Acoustic attenuator May. 17, 2005
6799657 Absorptive/reactive muffler for variable speed compressors Oct. 5, 2004
6796403 Exhaust system baffling apparatus Sep. 28, 2004
6742623 Muffler for internal combustion engine Jun. 1, 2004
6736238 Air intake silencer May. 18, 2004
6688425 Induction system with low pass filter for turbo charger applications Feb. 10, 2004
6651773 Exhaust sound attenuation and control system Nov. 25, 2003
6637546 Carpet cleaning machine Oct. 28, 2003
6622821 Thin acoustic muffler exhaust pipes, method of sheet metal construction thereof, and exhaust systems which utilize such exhaust pipes for increased ground clearance on race cars Sep. 23, 2003
6609590 Exhaust system having angled baffle Aug. 26, 2003
6510921 Muffler/exhaust extractor Jan. 28, 2003
6488482 Integral compressor muffler Dec. 3, 2002
6131696 Multiple inlet muffler Oct. 17, 2000
6079516 Auto-matic back pressure relief muffler Jun. 27, 2000
5844178 Resonance muffler Dec. 1, 1998
5739484 Exhaust muffler Apr. 14, 1998
5733106 Suction muffler for a reciprocating compressor with external holes to reduce noise attenuation Mar. 31, 1998
5661973 Muffler and fuel saving device for internal combustion diesel engine Sep. 2, 1997

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