US PATENT SUBCLASS 75 / 561
.~.~.~.~.~.~ 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}
560  DF  .~.~.~.~.~ Treating premelted Iron(Fe) or slag layer thereon by adding solid agent, slag, or flux {9}
561.~.~.~.~.~.~ Loose elemental Carbon(C), coal, or coke (e.g., carburizing, etc.)

DEFINITION

Classification: 75/561

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

(under subclass 560) 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 560.

SEE OR SEARCH THIS CLASS, SUBCLASS:

532, for the use of elemental Carbon, coal, or coke in treating molten metal that contains over 50 percent by weight Iron or slag layer thereon in a process also utilizing a gas or liquid which gasifies.

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.