US PATENT SUBCLASS 381 / 357
.~.~.~ With plural sound ports (e.g., pressure gradient)

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}
355  DF  .~ Housed microphone {4}
356  DF  .~.~ Directional {1}
357.~.~.~ With plural sound ports (e.g., pressure gradient) {1}
358  DF  .~.~.~.~> Plural or variable characteristics

DEFINITION

Classification: 381/357

With plural sound ports (e.g., pressure gradient):

(under subclass 356) Subject matter having two or more openings within the housing for the purpose of providing multiple sound paths leading to a transducer.