US PATENT SUBCLASS 62 / 619
.~.~.~ Compression, expansion, and condensation

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}
619.~.~.~ Compression, expansion, and condensation

DEFINITION

Classification: 62/619

Compression, expansion, and condensation:

(under subclass 618) Subject matter wherein the gas mixture is pressurized and depressurized in order to separate out a constituent of the mixture and the constituent is liquified or solidified.