US PATENT SUBCLASS 381 / 174
.~.~ Capacitive

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}
369  DF  .~ Microphone capsule only {10}
174.~.~ Capacitive

DEFINITION

Classification: 381/174

Capacitive:

(under subclass 168) Subject matter having an electrostatic capacitance element which varies in accordance with sound waves incident thereon.

SEE OR SEARCH CLASS

361, Electricity: Electrical Systems and Devices,

283.1+, for pressure responsive electrostatic capacitors, per se.