US PATENT SUBCLASS 62 / 643
.~.~.~ Distillation

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.~.~.~ Distillation {4}
644  DF  .~.~.~.~> Upstream operation {2}
648  DF  .~.~.~.~> Downstream operation {2}
655  DF  .~.~.~.~> Membrane
656  DF  .~.~.~.~> Automatic control

DEFINITION

Classification: 62/643

Distillation:

(under subclass 640) Subject matter wherein the constituents of air are extracted by a combination of temperature and pressure control in a mass transfer column.