US PATENT SUBCLASS 209 / 683
.~.~.~.~ Aperture in circumferential wall of hollow body (e.g., tube, etc.) rotatable about longitudinal axis thereof

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

509  DF  SORTING SPECIAL ITEMS, AND CERTAIN METHODS AND APPARATUS (E.G., POCKET TYPE AND LIGHT RESPONSIVE SORTING, ETC.) FOR SORTING ANY ITEMS {11}
606  DF  .~ Separating means {33}
659  DF  .~.~ Sorting items by size {3}
680  DF  .~.~.~ Item of particular size passed through gauging aperture in wall (e.g., perforated panel, etc.) {3}
683.~.~.~.~ Aperture in circumferential wall of hollow body (e.g., tube, etc.) rotatable about longitudinal axis thereof

DEFINITION

Classification: 209/683

Aperture in circumferential wall of hollow body (e.g., tube, etc.) rotatable about longitudinal axis thereof:

(under subclass 680) Methods and apparatus wherein said aperture is in the circumferentially extending wall of a hollow body rotatable about its longitudinal axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

44.3, for drum-type sifters combined with separating apparatus within the class definition, but not included in subclasses 509 through 707.