US PATENT SUBCLASS 374 / 177
.~.~.~ Ferroelectric

Current as of: June, 1999
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374 /   HD   THERMAL MEASURING AND TESTING

100  DF  TEMPERATURE MEASUREMENT (E.G., THERMOMETER) {13}
163  DF  .~ By electrical or magnetic heat sensor {13}
176  DF  .~.~ Including sensor having hysteresis or cryogenic property (e.g., ferromagnetism, superconductivity) {1}
177.~.~.~ Ferroelectric

DEFINITION

Classification: 374/177

Ferroelectric:

(under subclass 176) Subject matter wherein the sensor has a spontaneous electrical polarization.

(1) Note. Included herein is an electret sensor in a thermometer.

SEE OR SEARCH CLASS

307, Electrical Transmission or Interconnection Systems,

400, for electrets, per se.