Patent ID: 7887396
Filing Date: 2011-02-15
Classification: B24B,C23F,G11B,H01L

Abstract:
1. An apparatus for polishing an object comprising a polishing surface having unobstructed and continuous grooves disposed thereon which define a plurality of land areas between the grooves wherein the grooves have at least one of an unobstructed and continuous non-uniform pattern, pitch, and cross-sectional area across a diameter of the polishing surface and at least one of the land areas has a slurry channel extending therethrough, and wherein minor grooves are disposed within the plurality of land areas, the minor grooves having a smaller cross-sectional area than the unobstructed and continuous grooves defining the boundaries of the plurality of land areas, wherein the minor grooves have at least one of a non-uniform pattern, pitch, and cross-sectional area across at least one of the land areas.