US PATENT SUBCLASS 381 / 191
.~ Having electrostatic element (e.g., electret, vibrating plate)

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}
191.~ Having electrostatic element (e.g., electret, vibrating plate)

DEFINITION

Classification: 381/191

Having electrostatic element (e.g., electret, vibrating plate):

(under subclass 150) Subject matter including either a capacitor with a vibratable plate, or an element which has a spontaneous electrical field, one of which is caused to vibrate by an audio signal or incident sound.

SEE OR SEARCH THIS CLASS, SUBCLASS:

174, for a capacitive microphone.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

400, for electrets.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems, 516, for miscellaneous vibration sensitive circuits.

361, Electricity: Electrical Systems and Devices,

283.1+, for a pressure responsive capacitor, per se.