US PATENT SUBCLASS 209 / 151
.~.~.~.~ Stepped plane

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

132  DF  FLUID SUSPENSION {2}
133  DF  .~ Gaseous {7}
146  DF  .~.~ Feeding {3}
147  DF  .~.~.~ Conveyor {4}
151.~.~.~.~ Stepped plane

DEFINITION

Classification: 209/151

(under subclass 147) Methods and means wherein material is passed over a series of planes in stepped relation and subjected to a suspending current of gas while passing from step to step, which current generally is horizontal or inclined.

SEE OR SEARCH THIS CLASS, SUBCLASS:

314, through 319, 354 and 355, for plane sifters placed in stepped or superposed relation.