US PATENT SUBCLASS 62 / 623
.~.~.~.~ External refrigeration circuit

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}
620  DF  .~.~.~ Distillation {9}
623.~.~.~.~ External refrigeration circuit

DEFINITION

Classification: 62/623

External refrigeration circuit:

(under subclass 620) Subject matter wherein the gas or gas mixture or the products of separation are operated upon by an outside source of refrigeration.

SEE OR SEARCH THIS CLASS, SUBCLASS:

912, for external refrigeration systems not specific to hydrocarbon separation.