US PATENT SUBCLASS 209 / 455
.~.~.~.~ Pulsating current

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

422  DF  STRATIFIERS {6}
*  DD  .~ With liquid treatment {3}
*  DD  .~.~ Stationary bed {3}
*  DD  .~.~.~ Permeable {2}
455.~.~.~.~ Pulsating current {2}
456  DF  .~.~.~.~.~> Divergent or opposite travel
457  DF  .~.~.~.~.~> Parallel travel

DEFINITION

Classification: 209/455

(under subclass 422) Apparatus including stationary perforated or permeable supports to which material is delivered and having means whereby liquid is sent in pulsating or interrupted currents through the support and material thereon, so that the heaviest constituents of the material may settle as a stratum, while the lighter may either form overlying strata or be carried away by the liquid.