US PATENT SUBCLASS 75 / 511
.~.~.~.~.~.~.~ With addition of gas

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}
508  DF  .~.~.~.~.~ Vacuum treatment of molten Iron(Fe) {3}
510  DF  .~.~.~.~.~.~ Vacuum lift {1}
511.~.~.~.~.~.~.~ With addition of gas

DEFINITION

Classification: 75/511

With addition of gas:

(under subclass 510) Process wherein a gas is intentionally added to the molten metal that contains over 50 percent by weight Iron (Fe) while it is being treated by lifting under a vacuum.

(1) Note. The gas must be added intentionally, mere accidental leakage is ignored. The amount of gas added is restricted so that the pressure of gas over the molten metal remains significantly under one atmosphere.