US PATENT SUBCLASS 62 / 652
.~.~.~.~.~.~ Oxygen

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}
648  DF  .~.~.~.~ Downstream operation {2}
649  DF  .~.~.~.~.~ Flowline expansion engine {3}
652.~.~.~.~.~.~ Oxygen

DEFINITION

Classification: 62/652

Oxygen:

(under subclass 649) Subject matter wherein the extracted constituent is oxygen.