US PATENT SUBCLASS 75 / 717
.~.~.~.~ Reducing to free metal with gas

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}
710  DF  .~.~ Below 300 degrees C {2}
711  DF  .~.~.~ Using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.) {11}
717.~.~.~.~ Reducing to free metal with gas {2}
718  DF  .~.~.~.~.~> Copper (Cu) recovered as free metal {1}
720  DF  .~.~.~.~.~> Noble metal recovered as free metal

DEFINITION

Classification: 75/717

Reducing to free metal with gas:

(under subclass 711) Process wherein a gas (e.g., Hydrogen, Sulfur dioxide, Carbon monoxide, hydrocarbon, etc.) is used

to reduce a metalliferous material to free metal.

(1) Note. Partial reduction with a reducing gas from one ionic form to another is not sufficient for placement here. Free metal must be formed as a result of the gaseous treatment for this subclass.