US PATENT SUBCLASS 62 / 637
.~.~.~ Solidification

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}
618  DF  .~.~ Natural gas {5}
637.~.~.~ Solidification {1}
638  DF  .~.~.~.~> Regenerating heat exchanger

DEFINITION

Classification: 62/637

Solidification:

(under subclass 618) Subject matter wherein a constituent of a gas mixture is extracted by being formed into solids.