US PATENT SUBCLASS 62 / 618
.~.~ Natural gas

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.~.~ Natural gas {5}
619  DF  .~.~.~> Compression, expansion, and condensation
620  DF  .~.~.~> Distillation {9}
632  DF  .~.~.~> Liquid contact {3}
636  DF  .~.~.~> Sorption
637  DF  .~.~.~> Solidification {1}

DEFINITION

Classification: 62/618

Natural gas:

(under subclass 617) Subject matter wherein at least one of the constituents of the gas mixture is a hydrocarbon compound(hydrocarbon is separated from sulfur, CO2, etc.)or a hydrocarbon gas that is separated into its constituents(methane, butane, etc.).