US PATENT SUBCLASS 209 / 680
.~.~.~ Item of particular size passed through gauging aperture in wall (e.g., perforated panel, etc.)

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.~.~.~ Item of particular size passed through gauging aperture in wall (e.g., perforated panel, etc.) {3}
681  DF  .~.~.~.~> Aperture in orbiting belt
682  DF  .~.~.~.~> Aperture in chute or trough
683  DF  .~.~.~.~> Aperture in circumferential wall of hollow body (e.g., tube, etc.) rotatable about longitudinal axis thereof

DEFINITION

Classification: 209/680

Item of particular size passed through gauging aperture in wall (e.g., perforated panel, etc.):

(under subclass 659) Methods and apparatus including a wall having therein a gauging aperture through which an item of sufficiently small size passes to separate it from larger items.

(1) Note. Generally a gauging aperture classifiable in this subclass is formed in a single piece of material. Separate plates joined together by welding are considered to be a single piece of material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

233+, for sifting apparatus for bulk material.

660+, for a gauging passage between separate elements, including separate pieces of material which contact along edge portions thereof but which are spaced apart between these contacting portions to provide therebetween an opening used as a gauging passage.