US PATENT SUBCLASS 209 / 289
.~.~.~.~ Multiple

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

233  DF  SIFTING {16}
*  DD  .~ Drum sifters {2}
*  DD  .~.~ Horizontal and inclined {4}
288  DF  .~.~.~ Rotating {3}
289.~.~.~.~ Multiple {2}
290  DF  .~.~.~.~.~> Concentric {1}
292  DF  .~.~.~.~.~> Superposed

DEFINITION

Classification: 209/289

(under subclass 288) Sifting systems having a plurality of horizontal or inclined axis rotating cylindrical or drum sifters.

(1) Note. This subclass takes such systems as include pluralities of sifters of the type indicated which do not fall into the subclasses indented hereunder.