Patent ID: 8128464

Claim:
A chemical mechanical polishing pad comprising: a polishing surface; a non-polishing surface that is provided opposite to the polishing surface; a side surface that connects an outer edge of the polishing surface and an outer edge of the non-polishing surface; and a plurality of grooves formed in the polishing surface, wherein the side surface comprises a slope surface that is connected to the polishing surface, wherein a depth of the grooves is equal to or smaller than a height of the slope surface, wherein the polishing surface is circular, wherein the pad further comprises a plurality of circular grooves formed in the polishing surface, wherein the polishing surface is concentric with the plurality of circular grooves, and wherein a ratio, e/d, of a distance, e, between the outer edge of the polishing surface and the groove closest to the outer edge of the polishing surface to a distance, d, between adjacent grooves among the plurality of grooves is 0.3 to 2.