US PATENT SUBCLASS 209 / 233
SIFTING

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

233SIFTING {16}
234  DF  .~> Combined type
235  DF  .~> Special applications {2}
238  DF  .~> With heating or cooling
239  DF  .~> With weighting
240  DF  .~> Feeding and discharging {2}
243  DF  .~> Feeding {5}
254  DF  .~> Distributers or spreaders
255  DF  .~> Discharging {5}
261  DF  .~> Conveying {3}
268  DF  .~> With liquid treatment {3}
274  DF  .~> Concave and convex sifters {3}
*  DD  .~> Drum sifters {2}
307  DF  .~> Endless belt sifters {1}
*  DD  .~> Plane sifters {2}
362  DF  .~> Spiral sifters
363  DF  .~> Elements {7}

DEFINITION

Classification: 209/233

(under the class definition) Means and methods by which material is separated or assorted according to size or dimensions of components by presentation to a series of openings or passages through which the components having dimensions below those of the openings or passages pass while those having dimensions greater than those of the passages or openings do not pass through.

(1) Note. The distinction between this subclass and subclasses indented hereunder and subclasses 659+, sorting items by size, is mainly that subclasses 659+ generally deal with the assortment of special articles, such as fruit, vegetables, and various articles of manufacture as set forth in (1) Note of subclass 509, and the articles are usually presented individually to the sizing passages; while in subclasses 233+, the material is ordinarily presented indiscriminately to the series of passages. The distinction is, however, not clearcut, and search in one group should be extended into appropriate subclasses of the other group.

SEE OR SEARCH THIS CLASS, SUBCLASS:

12.1+, for sifting separation combined with other separation operations.

557, for a combination of a noncondition responsive special item sorting by size separating operation with a condition

responsive separating operation.

629+, for a combination of diverse types of special item separating operations. SEE OR SEARCH CLASS

99, Foods and Beverages: Apparatus,

521+, 522, 528, 603+, and 605+ for grain hullers embodying sifters.

241, Solids Material Comminution or Disintegration, appropriate subclasses, especially

49+, 69+, 83+ for screens combined with or forming part of a comminutor organization.