US PATENT SUBCLASS 367 / 163
.~.~.~ With diaphragm

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}
157  DF  .~.~ Piezoelectric {9}
163.~.~.~ With diaphragm

DEFINITION

Classification: 367/163

With diaphragm:

(under subclass 157) Subject matter having a flexible member which couples vibrations in an acoustic medium to or from the piezoelectric element.