US PATENT SUBCLASS 62 / 613
.~.~.~ 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}
606  DF  .~ Liquefaction {6}
611  DF  .~.~ Natural gas {3}
613.~.~.~ Compression, expansion, and condensation

DEFINITION

Classification: 62/613

Compression, expansion, and condensation:

(under subclass 611) Subject matter wherein the gas or gas mixture is pressurized, depressurized, and then liquified.