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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) |
69 |
| 181/229 |
Carburetor, burner, or compressor intake silencer |
230 |
| 181/244 |
Corrosion prevention |
20 |
| 181/233 |
Liquid motion silencer |
51 |
| 181/240 |
Manifold type |
115 |
| 181/242 |
Mouthpiece (e.g., telephone, microphone, etc.) |
28 |
| 181/238 |
Multiple distinct inlets and/or outlets |
77 |
| 181/227 |
Pipe-muffler (e.g., tail pipe type) |
139 |
| 181/230 |
Pneumatic type motor (e.g., air hammer, etc.) |
165 |
| 181/213 |
Reaction engine type |
151 |
| 181/232 |
Separate distinct units serially connected |
51 |
| 181/223 |
Silencer for firearms |
44 |
| 181/224 |
Sound absorbing ventilating duct or curb (e.g., a/c, heat, air flow type) |
225 |
| 181/247 |
Straight-through passage |
40 |
| 181/235 |
Underwater discharge |
38 |
| 181/226 |
With adjustable fluid flow |
25 |
| 181/264 |
With baffle or baffle structure |
170 |
| 181/259 |
With disparate fluid mingling |
21 |
| 181/228 |
With exhaust pipe |
140 |
| 181/225 |
With fan to assist fluid flow |
92 |
| 181/236 |
With muffler cut-out |
19 |
| 181/237 |
With pressure relief safety valve |
58 |
| 181/243 |
With repair, replacement, or quick disassembly |
130 |
| 181/231 |
With solid particle separator (e.g., spark arrestor, vacuum cleaner, etc.) |
107 |
| 181/256 |
With sound absorbing material |
202 |
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7624842 |
Exhaust system for an engine and motorcycle including the exhaust system |
Dec. 1, 2009 |
| 7610993 |
Flow-through mufflers with optional thermo-electric, sound cancellation, and tuning capabilities |
Nov. 3, 2009 |
| 7604092 |
Exhaust system |
Oct. 20, 2009 |
| 7581563 |
Exhaust pipe with profiled inner tube, and method of making an exhaust pipe |
Sep. 1, 2009 |
| 7552796 |
Turbine engine tailcone resonator |
Jun. 30, 2009 |
| 7549506 |
Method of suppressing combustion instabilities using a resonator adopting counter-bored holes |
Jun. 23, 2009 |
| 7549508 |
Muffler |
Jun. 23, 2009 |
| 7549509 |
Double throat pulsation dampener for a compressor |
Jun. 23, 2009 |
| 7537084 |
Discharge gas check valve integral with muffler |
May. 26, 2009 |
| 7537083 |
Silencer containing one or more porous bodies |
May. 26, 2009 |
| 7527774 |
Inlet metallic foam support coupled to precious metal catalyst for application on 4 stroke platforms |
May. 5, 2009 |
| 7506722 |
Vehicle exhaust systems |
Mar. 24, 2009 |
| 7485165 |
Air filtering device for protection suits |
Feb. 3, 2009 |
| 7464789 |
Exhaust silencer for internal combustion engine |
Dec. 16, 2008 |
| 7461719 |
Resonator performance by local reduction of component thickness |
Dec. 9, 2008 |
| 7407037 |
Exhaust silencer for internal combustion engine |
Aug. 5, 2008 |
| 7380639 |
Backpressure reducing exhaust system with stationary blade structure |
Jun. 3, 2008 |
| 7350619 |
Auxiliary power unit exhaust duct with muffler incorporating an externally replaceable acoustic liner |
Apr. 1, 2008 |
| RE39972 |
Detachable integral aircraft tailcone and power assembly |
Jan. 1, 2008 |
| 7278514 |
Acoustic noise filter |
Oct. 9, 2007 |
| 7273592 |
Combination exhaust gas post treatment/muffler device in the exhaust gas section of an internal combustion engine |
Sep. 25, 2007 |
| 7228935 |
Attachment pin for an exhaust-gas muffler |
Jun. 12, 2007 |
| 7194862 |
Resonator adopting counter-bored holes and method of suppressing combustion instabilities |
Mar. 27, 2007 |
| 7156624 |
Compressor sound suppression |
Jan. 2, 2007 |
| 7134847 |
Hermetic electric compressor having a suction muffler |
Nov. 14, 2006 |
| 7085388 |
High frequency jet nozzle actuators for jet noise reduction |
Aug. 1, 2006 |
| 7051523 |
Exhaust system assemblies employing wire bushings for thermal compensation |
May. 30, 2006 |
| 6935461 |
Exhaust sound and emission control systems |
Aug. 30, 2005 |
| 6918463 |
Muffler for engine |
Jul. 19, 2005 |
| 6892855 |
Embossed shell for spun mufflers |
May. 17, 2005 |
| 6860725 |
Suction gas guiding system for reciprocating compressor |
Mar. 1, 2005 |
| 6845843 |
Suction muffler for a refrigerating machine |
Jan. 25, 2005 |
| 6832665 |
Exhaust gas muffler |
Dec. 21, 2004 |
| 6832664 |
Clampless hose retainer mechanism |
Dec. 21, 2004 |
| 6802387 |
Muffler with external water trap |
Oct. 12, 2004 |
| 6799657 |
Absorptive/reactive muffler for variable speed compressors |
Oct. 5, 2004 |
| 6789644 |
Engine muffler |
Sep. 14, 2004 |
| 6769511 |
Variable tuned exhaust system |
Aug. 3, 2004 |
| 6755279 |
Controllable muffler system for internal combustion engine |
Jun. 29, 2004 |
| 6715581 |
Exhaust pipe and muffler for motorcycle that does not heat discolor |
Apr. 6, 2004 |
| 6702062 |
Exhaust system for automobile engine |
Mar. 9, 2004 |
| 6679351 |
Air turbine for combustion engine |
Jan. 20, 2004 |
| 6659221 |
Engine intake silencer |
Dec. 9, 2003 |
| 6651773 |
Exhaust sound attenuation and control system |
Nov. 25, 2003 |
| 6589643 |
Energy conversion fiber and sound reducing material |
Jul. 8, 2003 |
| 6547536 |
Reciprocating compressor having a discharge pulsation |
Apr. 15, 2003 |
| 6524080 |
Hermetically sealed compressors |
Feb. 25, 2003 |
| 6467570 |
Spark arrester with spark filter |
Oct. 22, 2002 |
| 6457553 |
Low cost muffler |
Oct. 1, 2002 |
| 6425742 |
Discharge silencer provided with drain recovering function |
Jul. 30, 2002 |
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