US PATENT SUBCLASS 209 / 9
.~.~ Surface

Current as of: June, 1999
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209 /   HD   CLASSIFYING, SEPARATING, AND ASSORTING SOLIDS

3  DF  PRECEDENT PREPARATION OF ITEMS OR MATERIALS TO FACILITATE SEPARATION {2}
4  DF  .~ Selective differentiation {4}
9.~.~ Surface

DEFINITION

Classification: 209/9

(under subclass 4) Methods and apparatus whereby the surfaces of some components of a mixture are altered to permit or facilitate their separation from other components.

SEE OR SEARCH THIS CLASS, SUBCLASS:

47+, for adhesion separation including a coating operation, 163+, 175, 176, 178, 179, and 181 for flotation involving some surface alteration of the material to be separated.