US PATENT SUBCLASS 209 / 475
.~.~.~.~ With pulsating 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}
475.~.~.~.~ With pulsating current {1}
476  DF  .~.~.~.~.~> Divergent or opposite travel

DEFINITION

Classification: 209/475

(under subclass 422) Apparatus including stationary perforated or permeable supports for material and means for sending pulsating or interrupting gaseous currents through the supports and the material thereon, so that the heaviest constituents of the material may settle as a stratum, while the lighter constituents either form relatively displaced strata or are moved away by the gaseous currents, there being no substantial movement of the heaviest along the support or both the heaviest and the lighter moving in the same direction toward discharge.