US PATENT SUBCLASS 75 / 575
.~.~.~.~.~.~.~ Using Oxygen in a higher concentration than ambient air

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}
575.~.~.~.~.~.~.~ Using Oxygen in a higher concentration than ambient air

DEFINITION

Classification: 75/575

Using Oxygen in a higher concentration than ambient air:

(under subclass 573) Process wherein a gas that has a higher concentration of molecular Oxygen than ambient air is added to the shaft furnace at any place.