US PATENT SUBCLASS 381 / 354
.~.~ Absorbing or attenuating element

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}
337  DF  .~ Having acoustic wave modifying structure {5}
354.~.~ Absorbing or attenuating element

DEFINITION

Classification: 381/354

Absorbing or attenuating element:

(under subclass 337) Subject matter wherein undesired sound intensity or vibration is lessened.

SEE OR SEARCH THIS CLASS, SUBCLASS:

355, for housed microphone.

372, for mechanical or acoustic sound attenuation in combination with headphones.

375, for a microphone in a particular support structure, wherein there is no claimed electrical feature of the transducer, but there is an electrical feature of the support.

SEE OR SEARCH CLASS

181, Acoustics, 284+, for sound-absorbing means in a mechanical acoustic device or system.