US PATENT SUBCLASS 75 / 546
.~.~.~.~.~.~.~ Noble gas or inert gas not otherwise identified

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}
531  DF  .~.~.~.~.~.~ And adding solid agent, slag, or flux to premelted Iron(Fe) or slag layer thereon {5}
546.~.~.~.~.~.~.~ Noble gas or inert gas not otherwise identified

DEFINITION

Classification: 75/546

Noble gas or inert gas not otherwise identified:

(under subclass 531) Process wherein a Noble gas (i.e., Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), or Xenon (Xe) or an inert gas not otherwise identified is the injected gas.

(1) Note. If the injected gas is named (e.g., Carbon dioxide, etc.), it is classified by the named gas even if the

specification calls the gas inert.