US PATENT SUBCLASS 75 / 517
.~.~.~.~.~.~ With addition of solid elemental Carbon(C) or employing elemental Carbon furnace lining

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}
507  DF  .~.~.~.~ Melting Iron(Fe) or treating molten Iron {12}
513  DF  .~.~.~.~.~ In reverberatory furnace (e.g., open-hearth, Siemens-Martin, puddling, etc.) {9}
517.~.~.~.~.~.~ With addition of solid elemental Carbon(C) or employing elemental Carbon furnace lining

DEFINITION

Classification: 75/517

With addition of solid elemental Carbon (C) or employing elemental Carbon furnace lining:

(under subclass 513) Process in which solid elemental Carbon (C) is present in the reverberatory furnace at any time during the melting of metal that contains over 50 percent by weight Iron (Fe) or treatment of molten metal that contains over 50 percent by weight Iron, or in which the reverberatory furnace employs a lining which includes elemental Carbon.