US PATENT SUBCLASS 181 / 256
.~.~ 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}
256.~.~ With sound absorbing material {2}
257  DF  .~.~.~> And multi-passage
258  DF  .~.~.~> Pervious material interposed in flow path

DEFINITION

Classification: 181/256

With Sound absorbing material:

(under subclass 212) Subject matter having acoustic wave attenuating material positioned to be contacted by the moving fluid, as by surrounding or being positioned adjacent to and communicating with the fluid passage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

222, for jet engine muffler devices having sound absorbing material.

247, for straight-through continuous passage mufflers having sound absorbing material.

252, for through passage mufflers with sound absorbing material.