Patent ID: 7377837

Claim:
An improved grinding or polishing disc of the type adapted to have a grinding or polishing material on a lower surface thereof comprising: a. said grinding or polishing disc having an upper surface, a lower surface, and a center area, a central aperture in the center area extending from the upper surface to the lower surface, the central aperture enabling the disc to be coupled to a rotatable shaft for rotation therewith; and b. said grinding or polishing disc having a generally circular peripheral edge, the lower surface adapted to grind or polish the surface of a work piece, and having walls defining a multiplicity of slots extending through said grinding or polishing disc from said upper surface to said lower surface, the multiplicity of slots comprising four radially extending slots placed approximately ninety degrees apart and extending from the generally circular edge toward the center of the disc but not extending to the central aperture and four generally arcuate extending slots spaced approximately ninety degrees apart and extending from the generally circular edge toward the center of the disc but not extending to the central aperture, the radially extending slots and the arcuate slots respectively positioned so that an arcuate slot is intermediate between two radially extending slots and a radially extending slot is intermediate between two arcuate slots; c. whereby the multiplicity of radial slots combined with the multiplicity of arcuate slots in the disc provides significantly greater viewing of the work piece during a grinding or polishing operation.