US PATENT SUBCLASS 381 / 348
.~.~.~.~ On rear side of diaphragm

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}
345  DF  .~.~ Acoustic enclosure {6}
346  DF  .~.~.~ Acoustic resistance {2}
348.~.~.~.~ On rear side of diaphragm

DEFINITION

Classification: 381/348

On rear side of diaphragm:

(under subclass 346) Subject matter in which an acoustic resistance is placed within a non-primary sound radiation path of a vibrating membrane of a transducer.