US PATENT SUBCLASS 338 / 18
.~.~ Infrared radiation

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338 /   HD   ELECTRICAL RESISTORS

13  DF  RESISTANCE VALUE RESPONSIVE TO A CONDITION {10}
15  DF  .~ Photoconductive (e.g., light sensitive) {4}
18.~.~ Infrared radiation

DEFINITION

Classification: 338/18

(under subclass 15) Subject matter wherein the material of which the resistor is formed changes its resistance value materially upon the application of infra red radiation thereto.

SEE OR SEARCH THIS CLASS, SUBCLASS:

25+, for resistors whose resistance value changes with ambient temperature.