US PATENT SUBCLASS 75 / 489
.~.~.~.~.~ Externally supplied gas reductant

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}
488  DF  .~.~.~.~ Reduction to metallic Iron(Fe) within shaft furnace {2}
489.~.~.~.~.~ Externally supplied gas reductant {1}
490  DF  .~.~.~.~.~.~> Solid Iron(Fe) produced within shaft furnace {4}

DEFINITION

Classification: 75/489

Externally supplied gas reductant:

(under subclass 488) Process wherein a gaseous reductant is introduced into the shaft furnace from outside the furnace.

(1) Note. This and indented subclasses do not exclude the presence of solid reductant in the shaft furnace as long as a gaseous reductant is also supplied to the furnace from outside.