(under subclass 97) Subject matter usually consisting of a hollow rotating screen or a sieve which rolls, tumbles or agitates the grain while separating it from the chaff and other foreign matter.
SEE OR SEARCH CLASS
99, Foods and Beverages: Apparatus,
522, and 528 having multi-perforated rotary member which retains grain and allows nongrain material to pass through or allows the grain to pass through and retains nongrain material; subclass 603 for hulling means having moving perforated surface.
241, Solid Material Comminution or Disintegration,
69+, where the discharge permitting screen forms a partition or end wall in a rotary comminuting drum; subclasses 83+ appropriate subclasses indented there under which include rotary comminuting surface having openings, and wherein screen or screen elements move during comminution.
