US PATENT SUBCLASS 62 / 655
.~.~.~.~ Membrane

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}
655.~.~.~.~ Membrane

DEFINITION

Classification: 62/655

Membrane:

(under subclass 643) Subject matter wherein the operation is the passage through a gas permeable barrier for further separation.

SEE OR SEARCH CLASS

95, Gas Separation: Processes,

43+, for specific membrane structure.