US PATENT SUBCLASS 381 / 339
.~.~ Sound intensifying or spreading 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}
339.~.~ Sound intensifying or spreading element {2}
340  DF  .~.~.~> Horn {3}
344  DF  .~.~.~> Mouthpiece

DEFINITION

Classification: 381/339

Sound intensifying or spreading element:

(under subclass 337) Subject matter wherein a) the amplitude of a sound wave is increased, or b) wherein the sound from the transducer is widely dispersed.