US PATENT SUBCLASS 369 / 144
.~.~.~ Electret or piezoelectric

Current as of: June, 1999
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369 /   HD   DYNAMIC INFORMATION STORAGE OR RETRIEVAL

99  DF  SPECIFIC DETAIL OF INFORMATION HANDLING PORTION OF SYSTEM {4}
127  DF  .~ Mechanical modification or sensing of storage medium {6}
135  DF  .~.~ Specified structure of electrical transducing assembly {11}
144.~.~.~ Electret or piezoelectric

DEFINITION

Classification: 369/144

Electret or piezoelectric:

(under subclass 135) Subject matter wherein the transducer element has a bound electrostatic charge or is otherwise an electrostatic generator.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

400, for electret systems in general.

310, Electrical Generator or Motor Structure,

311+, for piezoelectric generators.