US PATENT SUBCLASS 34 / 531
.~.~.~.~ With threshold circuit device

Current as of: June, 1999
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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

523  DF  APPARATUS {40}
524  DF  .~ With automatic control {11}
526  DF  .~.~ Of plural operations {3}
527  DF  .~.~.~ Of specific operational sequence {5}
531.~.~.~.~ With threshold circuit device {2}
532  DF  .~.~.~.~.~> Gaseous tube (e.g., neon)
533  DF  .~.~.~.~.~> Silicon-controlled rectifier (SCR)

DEFINITION

Classification: 34/531

With threshold circuit device:

(under subclass 527) Apparatus combined with a component in a control circuit which becomes conductive only with the application of a certain minimum of electromotive force.