(under subclass 107) Subject matter consisting of a framework of crisscrossed bars or rods or a network of coil or fine wire, or a concave plate with a plurality of uniformly spaced perforations.
(1) Note. This subclass provides for specific detail of the grid and grate portion of the concave.
SEE OR SEARCH CLASS
209, Classifying, Separating, and Assorting Solids,
396, wherein sifting passages are formed by bars or rods; subclass 401 wherein sifting passages are formed by spaced intermeshing or crossing connected wires or bars; subclasses 659+ for apparatus for sorting items by size which includes curved grating passages (e.g., bar, slat, etc.) between stationary element and roller.
241, Solid Material Comminution or Disintegration,
51, wherein screen forms part of comminuting surface; subclass 88.4 for spaced parallel bars (e.g., "Grate").
