US PATENT SUBCLASS 181 / 252
.~.~.~ With sound absorbing material

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}
252.~.~.~ With sound absorbing material

DEFINITION

Classification: 181/252

With sound absorbing material:

(under subclass 247) Subject matter having acoustic wave attenuating material positioned within the fluid conducting device to be contacted by the exhaust fluid as by surrounding the through passage or being positioned adjacent to and communicating with the exhaust fluids.

SEE OR SEARCH THIS CLASS, SUBCLASS:

222, 248 and 256, for similar sound absorbing devices having sound absorbing material.