US PATENT SUBCLASS 367 / 157
.~.~ Piezoelectric

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.~.~ Piezoelectric {9}
158  DF  .~.~.~> Head and tail mass
159  DF  .~.~.~> Elongated cylindrical element
160  DF  .~.~.~> Bending type {1}
162  DF  .~.~.~> With resonant or damping structure
163  DF  .~.~.~> With diaphragm
164  DF  .~.~.~> Single element having a plurality of electrodes
165  DF  .~.~.~> Specific support structure
166  DF  .~.~.~> Liquid filled
167  DF  .~.~.~> Pressure compensating means

DEFINITION

Classification: 367/157

Piezoelectric:

(under subclass 141) Subject matter wherein the energy is converted by a material which exhibits an electrostatic polarization when subjected to mechanical stress or which exhibits mechanical stress tending to produce deflection, expansion, or contraction when subjected to electrical stress.

SEE OR SEARCH THIS CLASS, SUBCLASS:

180, for piezoelectric transducers of this class type not limited to underwater use.

SEE OR SEARCH CLASS

310, Electrical Generator or Motor Structure,

311+, for piezoelectric elements and devices of general utility.