US PATENT SUBCLASS 62 / 620
.~.~.~ Distillation

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.~.~.~ Distillation {9}
621  DF  .~.~.~.~> Flowline expansion engine {1}
623  DF  .~.~.~.~> External refrigeration circuit
624  DF  .~.~.~.~> Membrane
625  DF  .~.~.~.~> Liquid contact
626  DF  .~.~.~.~> Solid sorption
627  DF  .~.~.~.~> Dephlemation
628  DF  .~.~.~.~> Automatic control
629  DF  .~.~.~.~> Solidification
630  DF  .~.~.~.~> Plural columns {1}

DEFINITION

Classification: 62/620

Distillation:

(under subclass 618) Subject matter wherein the gas mixture is directed to a mass transfer column and volatized or evaporated and a constituent is extracted by condensation.