(under subclass 233) Sifting means or methods adapted for sifting materials mingled with liquid or for subjecting the material to the action of a liquid to promote the sifting effect.
(1) Note. This subclass and the subclasses indented thereunder do not include cases where the liquid is employed to promote stratifying or liquid suspension separation and the sifting is independent of the liquid treatment or a mere incident of some other separation due to the effect of the liquid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
12.1, 13, 14, 17, 42, and 44, for combinations of sifting and fluid suspension or stratifying type separations.
423, through 427 and 454-457, for stratifiers employing a permeable bed.
