US PATENT SUBCLASS 75 / 420
.~.~.~.~.~ Step at less than 300 degrees C using nonmetallic material which is liquid under standard conditions is reduction to free metal

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
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}
419  DF  .~.~.~.~ Step at less than 300 degrees C using nonmetallic material which is liquid under standard conditions after a step at 300 degrees C or greater {1}
420.~.~.~.~.~ Step at less than 300 degrees C using nonmetallic material which is liquid under standard conditions is reduction to free metal {3}
421  DF  .~.~.~.~.~.~> Noble metal {2}
424  DF  .~.~.~.~.~.~> Copper(Cu)
425  DF  .~.~.~.~.~.~> Iron(Fe), Cobalt(Co), or Nickel(Ni)

DEFINITION

Classification: 75/420

Step at less than 300 degrees C using nonmetallic material which is liquid under standard conditions is reduction to free metal:

(under subclass 419) Process wherein reduction to free metal occurs in a step at less than 300 degrees C using nonmetallic material which is liquid under standard conditions, which step is after a step at over 300 degrees C.