US PATENT SUBCLASS 62 / 923
Inert gas

Current as of: June, 1999
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62 /   HD   REFRIGERATION

923Inert gas {2}
924  DF  .~> Argon
925  DF  .~> Xenon or krypton

DEFINITION

Classification: 62/923

Inert gas:

Subject matter specific to the separation of nonreactive gases not provided for below.