US PATENT SUBCLASS 75 / 529
.~.~.~.~.~.~ With hydrocarbon liquid or gas present

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}
528  DF  .~.~.~.~.~ Injecting gas or nonmetalliferous liquid which gasifies into, onto, or through premelted Iron(Fe) or slag layer thereon {5}
529.~.~.~.~.~.~ With hydrocarbon liquid or gas present {1}
530  DF  .~.~.~.~.~.~.~> And hydrocarbon in surrounding relationship to gaseous Oxygen (e.g., hydrocarbon in outer concentric tube, etc.)

DEFINITION

Classification: 75/529

With hydrocarbon liquid or gas present:

(under subclass 528) Process wherein a liquid or gaseous compound consisting only of Carbon (C) and Hydrogen (H) (e.g., Propane, Butane, petroleum, etc.) is present during the treatment of the premelted metal that contains over 50 percent by weight Iron (Fe).

(1) Note. The hydrocarbon must be involved in direct or indirect treatment of the molten metal or slag layer thereon and must be present after the melting stage. Use of

hydrocarbon liquid or gas for melting is not sufficient for this subclass.