US PATENT SUBCLASS 381 / 350
.~.~.~ Front wave

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}
350.~.~.~ Front wave

DEFINITION

Classification: 381/350

Front wave:

(under subclass 345) Subject matter in which a primary sound radiation path from a transducer's diaphragm is vented to ambient through the housing or cavity.