US PATENT SUBCLASS 381 / 114
.~ With piezoelectric microphone

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

111  DF  CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER {6}
114.~ With piezoelectric microphone

DEFINITION

Classification: 381/114

With piezoelectric microphone:

(under subclass 111) Subject matter where the transducer is a piezoelectric microphone.

SEE OR SEARCH THIS CLASS, SUBCLASS:

173, for a piezoelectric microphone, per se.

SEE OR SEARCH CLASS

310, Electrical Generator or Motor Structure,

311+, for piezoelectric transducers.

367, Communications, Electrical: Acoustic Wave Systems and Devices, 157+, for underwater type piezoelectric transducers.