US PATENT SUBCLASS 75 / 574
.~.~.~.~.~.~.~ Without the use of solid, carbonaceous material (e.g., without coke, 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}
573  DF  .~.~.~.~.~.~ In shaft furnace (e.g., cupola, etc.) {6}
574.~.~.~.~.~.~.~ Without the use of solid, carbonaceous material (e.g., without coke, etc.)

DEFINITION

Classification: 75/574

Without the use of solid, carbonaceous material (e.g., without coke, etc.):

(under subclass 573) Process wherein no solid, carbonaceous material (e.g., coke, etc.) is present in the shaft furnace during the melting process.

(1) Note. Usually in this subclass the heat required to melt the Iron (Fe) is obtained by injecting a gaseous fuel with air through tuyeres on the bottom of the shaft furnace.