US PATENT SUBCLASS 340 / 634
.~.~.~.~ Semiconductor detector

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

500  DF  CONDITION RESPONSIVE INDICATING SYSTEM {6}
540  DF  .~ Specific condition {18}
603  DF  .~.~ Fluent material {7}
632  DF  .~.~.~ Gas {2}
634.~.~.~.~ Semiconductor detector

DEFINITION

Classification: 340/634

Semiconductor detector:

(under subclass 632) Subject matter wherein the detector is composed of material having an electrical conductivity between that of metals and that of insulators, and which conductivity increases in the presence of a sensed gas.

(1) Note. The sensor may include a heating element to raise its temperature to the appropriate operating range.

SEE OR SEARCH CLASS

338, Electrical Resistors,

34, for a gas responsive resistor.