US PATENT SUBCLASS 75 / 532
.~.~.~.~.~.~.~ Loose elemental Carbon(C), coal, or coke (e.g., carburizing, etc.)

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}
528  DF  .~.~.~.~.~ Injecting gas or nonmetalliferous liquid which gasifies into, onto, or through premelted Iron(Fe) or slag layer thereon {5}
531  DF  .~.~.~.~.~.~ And adding solid agent, slag, or flux to premelted Iron(Fe) or slag layer thereon {5}
532.~.~.~.~.~.~.~ Loose elemental Carbon(C), coal, or coke (e.g., carburizing, etc.)

DEFINITION

Classification: 75/532

Loose elemental Carbon (C), coal, or coke (e.g., carburizing, etc.):

(under subclass 531) Process wherein the solid agent added to the molten metal that contains over 50 percent by weight Iron (Fe) or slag layer thereon is loose elemental Carbon (C), coal, or coke.

(1) Note. This subclass will take the use of loose Carbon, coal, or coke for carburizing, but is not limited to carburizing.

(2) Note. If the Carbon, coal, or coke is part of a consolidated composition containing other treating agents,

classification goes elsewhere under subclass 531.

SEE OR SEARCH THIS CLASS, SUBCLASS:

536, 537, 542, 543, 566, or 567, for the use of a metal carbide or a high carbon metal as a carburizing or treating agent.

561, for the use of elemental Carbon (C), coal, or coke in treating molten metal or slag layer thereon in absence of a gas or liquid treating agent.