US PATENT SUBCLASS 75 / 580
.~.~.~.~.~.~ In closed vessel with heat conducted through walls only (e.g., crucible melting, 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}
571  DF  .~.~.~.~.~ Melting solid Iron(Fe) {4}
580.~.~.~.~.~.~ In closed vessel with heat conducted through walls only (e.g., crucible melting, etc.)

DEFINITION

Classification: 75/580

In closed vessel with heat conducted through walls only (e.g., crucible melting, etc.):

(under subclass 571) Process in which the Iron (Fe) to be melted is placed in a vessel which is then closed with a lid so that no external materials such as combustion gasses can contact the Iron. The vessel is placed in a hot environment

and the Iron is melted solely by heat conducted through the walls of the vessel.

(1) Note. This is often called the crucible process.