US PATENT SUBCLASS 209 / 474
.~.~.~.~ With constant current

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

422  DF  STRATIFIERS {6}
*  DD  .~ With pneumatic treatment {3}
*  DD  .~.~ Stationary bed {1}
*  DD  .~.~.~ Permeable {2}
474.~.~.~.~ With constant current

DEFINITION

Classification: 209/474

(under subclass 422) Apparatus including stationary perforated or permeable supports for material through which constant gaseous currents are sent to cause the heaviest constituents of the material to settle as stratum, while the lighter constituents either form relatively displaced strata or are removed by the gaseous currents.