US PATENT SUBCLASS 381 / 372
.~.~.~.~ Having mechanical or acoustic sound attenuation

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

150  DF  ELECTRO-ACOUSTIC AUDIO TRANSDUCER {18}
182  DF  .~ Plural or compound reproducers {4}
370  DF  .~.~ Headphone {3}
371  DF  .~.~.~ Particular cup {2}
372.~.~.~.~ Having mechanical or acoustic sound attenuation

DEFINITION

Classification: 381/372

Having mechanical or acoustic sound attenuation:

(under subclass 371) Subject matter in which the particular feature of a cup is designed to reduce noise.

SEE OR SEARCH THIS CLASS, SUBCLASS:

354, for an absorbing or attenuating element in acoustic wave

modifying structure.