US PATENT SUBCLASS 62 / 634
.~.~.~.~ Expansion

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}
632  DF  .~.~.~ Liquid contact {3}
634.~.~.~.~ Expansion

DEFINITION

Classification: 62/634

Expansion:

(under subclass 632) Subject matter wherein the gas or gas mixture or a product of separation undergoes a volumetric increase.