US PATENT SUBCLASS 423 / 558
.~.~.~ Iron containing

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

511  DF  SULFUR OR COMPOUND THEREOF {4}
512.1  DF  .~ Oxygen containing {11}
544  DF  .~.~ Sulfate {7}
558.~.~.~ Iron containing

DEFINITION

Classification: 423/558

(under subclass 544) Products or processes wherein the compound contains iron.