US PATENT SUBCLASS 75 / 698
.~.~.~.~.~.~ 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}
693  DF  .~.~.~.~ Lead(Pb) {3}
697  DF  .~.~.~.~.~ Treating molten Lead(Pb) {3}
698.~.~.~.~.~.~ By vacuum

DEFINITION

Classification: 75/698

By vacuum:

(under subclass 697) Process in which molten metal that contains over 50 percent by weight Lead (Pb) is subjected to sub-atmospheric pressures.