US PATENT SUBCLASS 62 / 608
.~.~ Helium

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}
608.~.~ Helium

DEFINITION

Classification: 62/608

Helium:

(under subclass 606) Subject matter wherein the gas being liquified is helium.