US PATENT SUBCLASS 367 / 158
.~.~.~ Head and tail mass

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}
158.~.~.~ Head and tail mass

DEFINITION

Classification: 367/158

Head and tail mass:

(under subclass 157) Subject matter wherein the piezoelectric element has a mass acting as a driving or driven piston at one end of its axis and a relatively stationary inertial mass at the other end.