US PATENT SUBCLASS 75 / 724
.~.~.~.~ Displacing by another metal (i.e., electromotive series)

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}
710  DF  .~.~ Below 300 degrees C {2}
711  DF  .~.~.~ Using nonmetallic material which is liquid under standard conditions (e.g., hydrometallurgy, etc.) {11}
724.~.~.~.~ Displacing by another metal (i.e., electromotive series) {4}
725  DF  .~.~.~.~.~> Lead(Pb) or Zinc(Zn) recovered as free metal
726  DF  .~.~.~.~.~> Copper(Cu) recovered as free metal {5}
732  DF  .~.~.~.~.~> Noble metal recovered as free metal {2}
738  DF  .~.~.~.~.~> Nickel(Ni) or Cobalt(Co) recovered as free metal

DEFINITION

Classification: 75/724

Displacing by another metal (i.e., electromotive series):

(under subclass 711) Process wherein a more electropositive free metal displaces a less electropositive metal from solution in a free metal form, while the more electropositive metal goes into solution in ionic form.

(1) Note. This process is sometimes referred to as cementation.

(2) Note. Electrowinning will be considered to mean separation of metals by electrolysis proper for Class 205 unless otherwise indicated. A few patents use the term electrowinning to refer to displacement and when indicated proper classification is in Class 75.

SEE OR SEARCH CLASS

205, Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions,

334+, or 687+, as appropriate, for electrowinning or separation of metals by electrolysis.