US PATENT SUBCLASS 62 / 628
.~.~.~.~ Automatic control


Current as of: June, 1999
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62 /   HD   REFRIGERATION

600  DF  CRYOGENIC TREATMENT OF GAS OR GAS MIXTURE {4}
617  DF  .~ Separation of gas mixture {3}
618  DF  .~.~ Natural gas {5}
620  DF  .~.~.~ Distillation {9}
628.~.~.~.~ Automatic control


DEFINITION

Classification: 62/628

Automatic control:

(under subclass 620) Subject matter wherein the separation operation changed in response to a sensed condition without the intervention by an operator.

SEE OR SEARCH CLASS

364, Electrical Computers and Data Processing Systems,

528.05, for computerized control of distillation columns.