US PATENT SUBCLASS 181 / 222
.~.~.~ 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}
213  DF  .~.~ Reaction engine type {7}
222.~.~.~ With sound absorbing material

DEFINITION

Classification: 181/222

With sound absorbing material:

(under subclass 213) Subject matter comprising sound absorbing material positioned in the shroud to be contacted by the exhaust gases, as by surrounding or being positioned adjacent to and communicating with the exhaust gases.

SEE OR SEARCH THIS CLASS, SUBCLASS:

248, 252 and 256+, for similar sound absorbing devices with sound absorbing material.