US PATENT SUBCLASS 62 / 651
.~.~.~.~.~.~ Low pressure nitrogen


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}
640  DF  .~.~ Air {3}
643  DF  .~.~.~ Distillation {4}
648  DF  .~.~.~.~ Downstream operation {2}
649  DF  .~.~.~.~.~ Flowline expansion engine {3}
651.~.~.~.~.~.~ Low pressure nitrogen


DEFINITION

Classification: 62/651

Low pressure nitrogen:

(under subclass 649) Subject matter wherein the extracted constituent is nitrogen extracted from the low pressure section of the column.