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Class Information
Number: 181/212
Name: Acoustics > Sound-modifying means > Muffler, fluid conducting type
Description: Subject matter for conducting or guiding moving liquids or gases, and acting on such moving liquids or gases to attenuate acoustic waves therein, i.e., "mufflers".










Sub-classes under this class:

Class Number Class Name Patents
181/241 Adjustable muffler (i.e., internal or external parts) 94
181/229 Carburetor, burner, or compressor intake silencer 296
181/244 Corrosion prevention 22
181/233 Liquid motion silencer 60
181/240 Manifold type 139
181/242 Mouthpiece (e.g., telephone, microphone, etc.) 29
181/238 Multiple distinct inlets and/or outlets 96
181/227 Pipe-muffler (e.g., tail pipe type) 221
181/230 Pneumatic type motor (e.g., air hammer, etc.) 184
181/213 Reaction engine type 219
181/232 Separate distinct units serially connected 64
181/223 Silencer for firearms 93
181/224 Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type) 299
181/247 Straight-through passage 56
181/235 Underwater discharge 45
181/226 With adjustable fluid flow 27
181/264 With baffle or baffle structure 209
181/259 With disparate fluid mingling 25
181/228 With exhaust pipe 221
181/225 With fan to assist fluid flow 127
181/236 With muffler cut-out 20
181/237 With pressure relief safety valve 90
181/243 With repair, replacement, or quick disassembly 142
181/231 With solid particle separator (e.g., spark arrestor, vacuum cleaner, etc.) 121
181/256 With sound absorbing material 253


Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8678132 Quiet muffler Mar. 25, 2014
8672090 Exhaust component with vibration isolated pipe Mar. 18, 2014
8646572 Exhaust muffler Feb. 11, 2014
8640822 Exhaust muffler Feb. 4, 2014
8636103 Muffler for vehicle Jan. 28, 2014
8602156 Multi-splice acoustic liner Dec. 10, 2013
8602158 Muffler system with protector for small-sized vehicle Dec. 10, 2013
8602157 Q4 muffler assembly Dec. 10, 2013
8596050 Sound attenuating heat exchanger for an internal combustion engine Dec. 3, 2013
8579077 Horizontally installed muffler having sporty tone Nov. 12, 2013
8550208 High pressure muffling devices Oct. 8, 2013
8540051 Silencer for a two-stroke motor of a power tool Sep. 24, 2013
8517143 Arrangement of a silencer on a combustion motor with improved coupling to the cylinder Aug. 27, 2013
8511427 Blower arrangement Aug. 20, 2013
8505678 Fluid transfer pipe and fluid transfer apparatus and a fluid attenuator and attenuator apparatus Aug. 13, 2013
8490744 Combustor and gas turbine having the same Jul. 23, 2013
8490745 Exhaust system component Jul. 23, 2013
8485311 Air duct assembly for engine Jul. 16, 2013
8485312 Exhaust pipe Jul. 16, 2013
8479879 Expandable chamber acoustic silencer Jul. 9, 2013
8469141 Acoustic damping device for use in gas turbine engine Jun. 25, 2013
8459408 Radiated sound reducing structure Jun. 11, 2013
8443932 Working machine May. 21, 2013
8439156 Muffler with controlled pressure release May. 14, 2013
8439157 Engine May. 14, 2013
8439159 Exhaust muffler for internal combustion engines May. 14, 2013
8424636 Muffler assembly and process of manufacture Apr. 23, 2013
8418805 Muffler for vehicle Apr. 16, 2013
8413760 Muffler attachment system Apr. 9, 2013
8408357 Air duct attenuator Apr. 2, 2013
8397531 Apparatus and method for pulsation and sound reduction in an economized refrigeration system Mar. 19, 2013
8365861 Muffler unit for fume extractor hood Feb. 5, 2013
8360199 Integrated mass air flow sensor and broadband silencer Jan. 29, 2013
8356690 Exhaust apparatus for an internal combustion engine Jan. 22, 2013
8348012 Resonator Jan. 8, 2013
8349096 Titanium alloy and automotive exhaust systems thereof Jan. 8, 2013
8312962 Sound absorber having helical fixtures Nov. 20, 2012
8307949 Exhaust device Nov. 13, 2012
8307948 Silencer device for a hair dryer Nov. 13, 2012
8307947 Duct sound damper for a flow machine Nov. 13, 2012
8307944 Muffler Nov. 13, 2012
8302732 Silencer Nov. 6, 2012
8292026 Silencer Oct. 23, 2012
8292024 Retainer device for a reducing agent metering valve Oct. 23, 2012
8251173 Muffler attachment system Aug. 28, 2012
8240428 Aspirator with integral muffler Aug. 14, 2012
8240429 System method and devices for windage noise damping in induction motor Aug. 14, 2012
8230968 Suction muffler for hermetic compressor Jul. 31, 2012
8220587 Silencer cover for saddle-ride type vehicle Jul. 17, 2012
8215447 Exhaust device of vehicle and straddle-type four-wheeled vehicle provided with the same Jul. 10, 2012

1 2 3 4










 
 
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