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Class Information
Number: 181/247
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type > Straight-through passage
Description: Subject matter wherein the fluid is conducted through a fluid conducting device having a linear, unobstructed passage at least the same size from the inlet to the outlet.










Sub-classes under this class:

Class Number Class Name Patents
181/248 Continuous conduit 54
181/255 Expansion chamber 181
181/253 With muffler bypass 44
181/252 With sound absorbing material 279


Patents under this class:
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Patent Number Title Of Patent Date Issued
8550122 Exhaust finisher retention operation Oct. 8, 2013
8485311 Air duct assembly for engine Jul. 16, 2013
8316987 Muffling structure of vent pipe and muffling structure of case Nov. 27, 2012
8141679 Absorptive muffler suspension Mar. 27, 2012
8051949 Vehicle exhaust muffler Nov. 8, 2011
8042649 Vehicular muffler and motorcycle incorporating same Oct. 25, 2011
7958966 Exhaust stack fairing Jun. 14, 2011
7946383 Acoustic load mitigator May. 24, 2011
7934581 Broadband noise resonator May. 3, 2011
7905319 Venturi muffler Mar. 15, 2011
7878298 Fuel-cell exhaust system Feb. 1, 2011
7806230 Absorptive muffler suspension Oct. 5, 2010
7793758 Triangular cross section exhaust muffler Sep. 14, 2010
7780421 Refrigerant compressor Aug. 24, 2010
7775322 Snap-action valve for exhaust system Aug. 17, 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
7549509 Double throat pulsation dampener for a compressor Jun. 23, 2009
7487857 Sonic coupling between an intake tract or engine compartment and the interior of a motor vehicle Feb. 10, 2009
7415956 Engine air intake system with resilient coupling having internal noise attenuation tuning Aug. 26, 2008
7380397 Automobile exhaust pipe assembly Jun. 3, 2008
7364013 Shell main body for muffler Apr. 29, 2008
7293628 Shell main body for muffler Nov. 13, 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
7111601 Air induction system having an environmentally resistant acoustic membrane Sep. 26, 2006
7104358 Silencer containing one or more porous bodies Sep. 12, 2006
6959678 Air intake apparatus and manufacturing method therefor Nov. 1, 2005
6913112 Noise attenuation assembly Jul. 5, 2005
6902030 Sound muffling apparatus for air operated equipment Jun. 7, 2005
6892855 Embossed shell for spun mufflers May. 17, 2005
6868939 Exhaust silencer system Mar. 22, 2005
6840348 Exhaust muffler 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
6530452 Reactive silencer for industrial air channels and its use Mar. 11, 2003
6347609 Wedge section multi-chamber resonator assembly Feb. 19, 2002
6158546 Straight through muffler with conically-ended output passage Dec. 12, 2000
6105717 Pipe section punning along a curve Aug. 22, 2000
5905233 Noise suppressor for displacement compressors May. 18, 1999
5657793 Vacuum cleaner hose and method for making same Aug. 19, 1997
5350888 Broad band low frequency passive muffler Sep. 27, 1994
5285026 Reactive sound attenuator, in particular for air ducts in paper mills Feb. 8, 1994
5173576 Muffler for an internal combustion engine Dec. 22, 1992
5170020 Rainproof exhaust pipe Dec. 8, 1992
4998597 Insulated exhaust pipe attachment means Mar. 12, 1991
4841728 Straight through type muffler for generating the exhaust flow from an internal combustion engine Jun. 27, 1989
4674594 Silencer and a method of manufacturing the silencer Jun. 23, 1987
4448538 Device for reducing static and dynamic pressures in pipelines, particularly of solid-borne sound in tubular conduits May. 15, 1984
4257370 Combined gear cover and mount for an internal combustion engine Mar. 24, 1981
4244440 Apparatus for suppressing internally generated gas turbine engine low frequency noise Jan. 13, 1981

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