US PATENT SUBCLASS 75 / 679
.~.~.~.~.~.~ Fractional crystallization

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}
585  DF  .~.~.~ Nonferrous {25}
671  DF  .~.~.~.~ Aluminum(Al) {4}
678  DF  .~.~.~.~.~ Treating molten Aluminum(Al) {3}
679.~.~.~.~.~.~ Fractional crystallization

DEFINITION

Classification: 75/679

Fractional crystallization:

(under subclass 678) Process in which molten metal that contains over 50 percent by weight Aluminum (Al) is preferentially crystallized in order to obtain purified metal. The impurities are excluded from the purified crystals that form.

SEE OR SEARCH CLASS

156, Adhesive Bonding and Miscellaneous Chemical Manufacture,

600+, for processes directed to the formation of a single crystal.