US PATENT SUBCLASS 75 / 691
.~.~.~.~.~ Reduction


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}
690  DF  .~.~.~.~ Tin(Sn) {1}
691.~.~.~.~.~ Reduction {1}
692  DF  .~.~.~.~.~.~> Of Halogen containing material


DEFINITION

Classification: 75/691

Reduction:

(under subclass 690) Process in which a Tin (Sn) compound is reduced to metal.