US PATENT SUBCLASS 75 / 500
.~.~.~.~ Reduction in molten state

Current as of: June, 1999
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75 /   HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES

330  DF  PROCESSES {9}
392  DF  .~ Producing or treating free metal {10}
414  DF  .~.~ At 300 degrees C or greater (e.g., pyrometallurgy, etc.) {7}
433  DF  .~.~.~ Iron(Fe) {18}
500.~.~.~.~ Reduction in molten state {2}
501  DF  .~.~.~.~.~> Gas injection below surface of melt
502  DF  .~.~.~.~.~> Gas injection over surface of melt (e.g., as in reverberatory furnace, etc.)

DEFINITION

Classification: 75/500

Reduction in molten state:

(under subclass 433) Process wherein some material is molten during the reduction (e.g., slag, Iron, etc.), and ingredients for carrying out the reaction are added to the melt.