US PATENT SUBCLASS 423 / 634
.~.~.~.~ Gamma form

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

579  DF  OXYGEN OR COMPOUND THEREOF {4}
592  DF  .~ Metal containing {12}
632  DF  .~.~ Iron {1}
633  DF  .~.~.~ Ferric oxide {1}
634.~.~.~.~ Gamma form

DEFINITION

Classification: 423/634

(under subclass 633) Products or processes wherein the ferric oxide is described as having cubic or gamma crystalline structure.