US PATENT SUBCLASS 181 / 253
.~.~.~ With muffler bypass

Current as of: June, 1999
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181 /   HD   ACOUSTICS

175  DF  SOUND-MODIFYING MEANS {12}
212  DF  .~ Muffler, fluid conducting type {25}
247  DF  .~.~ Straight-through passage {4}
253.~.~.~ With muffler bypass {1}
254  DF  .~.~.~.~> Valve controlled

DEFINITION

Classification: 181/253

With muffler bypass:

(under subclass 247) Subject matter having one or more passages, which performs a muffling function, which bypass the whole or part of the through passage.

(1) Note. Subject matter of this subclass type includes, for example, devices in which the bypassed fluid is returned out of phase with the fluid in the through passage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

236, in which the fluids are diverted from the muffler and are not muffled.

268, for devices which have a plurality of through passages connected in parallel.