US PATENT SUBCLASS 62 / 611
.~.~ Natural gas

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.~.~ Natural gas {3}
612  DF  .~.~.~> Multicomponent cascade refrigeration
613  DF  .~.~.~> Compression, expansion, and condensation
614  DF  .~.~.~> Heat exchange with liquid cryogen

DEFINITION

Classification: 62/611

Natural gas:

(under subclass 606) Subject matter wherein at least one of the constituents of the gas mixture is a hydrocarbon compound (hydrocarbon is separated from sulfur, CO2[end subscrpt], etc.) or a hydrocarbon gas that is separated into its constituents(methane, butane, etc.).