US PATENT SUBCLASS 62 / 656
.~.~.~.~ 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}
640  DF  .~.~ Air {3}
643  DF  .~.~.~ Distillation {4}
656.~.~.~.~ Automatic control

DEFINITION

Classification: 62/656

Automatic control:

(under subclass 643) Subject matter wherein the operation is changed in response to a sensed condition without the intervention of an operator.

SEE OR SEARCH CLASS

364, Electrical Computers and Data Processing Systems,

528.05, for computerized control of distillation columns.