Patent ID: 9649742
Date: 2017-05-16
CPC Classifications: B24B

Claim:
1. A polishing pad for polishing a substrate, the polishing pad comprising: a polishing body having a polishing side opposite a back surface; a polishing surface comprising a plurality of cylindrical protrusions continuous with the polishing side of the polishing body, wherein the plurality of cylindrical protrusions is arranged in a hexagonal-packed pattern; and a solid ring encompassing the plurality of cylindrical protrusions at an outer most edge of the polishing side of the polishing body, the solid ring continuous with the polishing side of the polishing body and having an inner shape that follows a contour of the hexagonal-packed pattern of the plurality of cylindrical protrusions, wherein the hexagonal-packed pattern of the plurality of cylindrical protrusions is interrupted by a plurality of grooves within the solid ring.