US PATENT SUBCLASS 75 / 551
.~.~.~.~.~.~.~ Injecting from above and below melt surface

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}
548  DF  .~.~.~.~.~.~ Gas contains gaseous Oxygen {4}
551.~.~.~.~.~.~.~ Injecting from above and below melt surface {1}
552  DF  .~.~.~.~.~.~.~>.~ Including other gas from below

DEFINITION

Classification: 75/551

Injecting from above and below melt surface:

(under subclass 548) Process wherein the Oxygen gas or Oxygen gas containing gas composition is injected from both above and below the melt surface at the same time or at different times in the processing.

(1) Note. Injection into the slag or slag-melt interface is considered to be from above the melt surface for the purposes of classification in this subclass.