US PATENT SUBCLASS 338 / 22 SD
.~.~.~ Semiconductor

Current as of: June, 1999
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338 /   HD   ELECTRICAL RESISTORS

13  DF  RESISTANCE VALUE RESPONSIVE TO A CONDITION {10}
20  DF  .~ Current and/or voltage (e.g., ballast resistor) {3}
22 R  DF  .~.~ Thermistor type {2}
22 SD.~.~.~ Semiconductor

Unofficial Alpha Subclasses: R SD

DEFINITION

Classification: 338/22

(under subclass 20) Subject matter wherein the resistance element is formed of a semi-conductor material and has a relatively high temperature coefficient, which is usually

negative.

SEE OR SEARCH THIS CLASS, SUBCLASS:

25+, for thermistors whose resistance values are changed by ambient temperature.

SEE OR SEARCH CLASS

257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes),

53, 108, and 467-470 for active solid-state type temperature responsive devices. 323, Electricity: Power Supply or Regulation Systems,

294, and subclasses 364+ for impedance systems responsive to a thermal condition.