US PATENT SUBCLASS 75 / 392
.~ Producing or treating free metal

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.~ Producing or treating free metal {10}
393  DF  .~.~> Utilizing Radioactive material, producing or treating Radioactive metal {3}
400  DF  .~.~> Free metal production from sea nodules
401  DF  .~.~> Treating multicomponent metal-containing scrap having an integral substrate to separate metal therefrom by temperature modification or chemical process at least one metal remains solid during separation {2}
404  DF  .~.~> Separating liquid metal by centrifuging
405  DF  .~.~> Removing gas from liquid metal by use of gas permeable membrane
406  DF  .~.~> Adsorbing impurity from vaporous or liquid metal
407  DF  .~.~> Filtering vaporous or liquid metal {5}
413  DF  .~.~> From metal carbonyl or Carbon monoxide complex
414  DF  .~.~> At 300 degrees C or greater (e.g., pyrometallurgy, etc.) {7}
710  DF  .~.~> Below 300 degrees C {2}

DEFINITION

Classification: 75/392

Producing or treating free metal:

(under subclass 330) Process wherein elemental metal is produced from metal compounds, such as ore, or wherein elemental metal is treated by a process not provided for elsewhere.

(1) Note. This and indented subclasses provide for a process of removing a component from a pre-existing alloy (e.g., purification, etc.).

(2) Note. Processes in which metal is treated in the molten state are specifically included hereunder.

SEE OR SEARCH CLASS

148, Metal Treatment, appropriate subclasses for processes of treating solid or semi-solid metal to modify or maintain the internal physical structure (i.e., microstructure) or chemical properties of metal. However, if metal casting, welding, machining, or working is involved, there is a requirement of significant heat treatment as described in section III, A, of the Class 148 definition.