US PATENT SUBCLASS 62 / 640
.~.~ Air

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.~.~ Air {3}
641  DF  .~.~.~> Regenerating heat exchanger
642  DF  .~.~.~> Filtration
643  DF  .~.~.~> Distillation {4}

DEFINITION

Classification: 62/640

Air:

(under subclass 617) Subject matter wherein the gas mixture is ambient air.