US PATENT SUBCLASS 367 / 170
.~.~ Electret

Current as of: June, 1999
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367 /   HD   COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES

140  DF  SIGNAL TRANSDUCERS {4}
141  DF  .~ Underwater type {15}
170.~.~ Electret

DEFINITION

Classification: 367/170

Electret:

(under subclass 141) Subject matter wherein acoustic wave energy acts on or is caused by a dielectric body having separated, permanent electric poles of opposite polarity.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

400, for electrets, per se.