US PATENT SUBCLASS 75 / 647
.~.~.~.~.~.~ By vacuum

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}
638  DF  .~.~.~.~ Copper(Cu) {5}
646  DF  .~.~.~.~.~ Treating molten Copper(Cu) {3}
647.~.~.~.~.~.~ By vacuum

DEFINITION

Classification: 75/647

By vacuum:

(under subclass 646) Process in which molten metal that contains over 50 percent by weight Copper (Cu) is subjected to sub-atmospheric pressures.