US PATENT SUBCLASS 75 / 752
.~.~.~ Vaporizing metalliferous impurity

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}
746  DF  .~ Consolidating metalliferous material (e.g., ore, tailings, flue dust, fluxes, etc.) by agglomerating, compacting, or heat treating; preparatory process therefor; or treating consolidated material therefrom {5}
751  DF  .~.~ With heat treatment (e.g., calcinating, fusing, indurating, roasting, sintering, vaporizing, etc.) {8}
752.~.~.~ Vaporizing metalliferous impurity

DEFINITION

Classification: 75/752

Vaporizing metalliferous impurity:

(under subclass 751) Process involving the removal of undesirable metalliferous material by vaporization thereof.

(1) Note. If the vaporization of elemental or free metal is involved, the subject matter is placed here only if the metal is considered an impurity. Otherwise, the subject matter is

classified in the above refining, or purifying subclasses for free metal production or Class 420 for alloy production.

(2) Note. Following precedent, Arsenic (As) is considered a metal for purposes of classification in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

748, for vaporization of impurity as a metal halide.