US PATENT SUBCLASS 75 / 414
.~.~ At 300 degrees C or greater (e.g., pyrometallurgy, etc.)

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.~.~ At 300 degrees C or greater (e.g., pyrometallurgy, etc.) {7}
415  DF  .~.~.~> Foam
416  DF  .~.~.~> Combined with step at less than 300 degrees C using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.) {8}
433  DF  .~.~.~> Iron(Fe) {18}
585  DF  .~.~.~> Nonferrous {25}
707  DF  .~.~.~> Reducing or smelting unnamed ore
708  DF  .~.~.~> Stirring or agitating of molten material
709  DF  .~.~.~> Covering the surface of molten metal

DEFINITION

Classification: 75/414

At 300 degrees C or greater (e.g., pyrometallurgy, etc.):

(under subclass 392) Process of producing or treating free metal wherein at least one step of the process takes place at a temperature of over 300 degrees C.

(1) Note. This and indented subclasses contain subject matter often referred to in the art as pyrometallurgy.