Patent ID: 8920219
Filing Date: 2014-12-30
Classification: B24B,B24D

Abstract:
1. A polishing apparatus for polishing a substrate, the polishing apparatus comprising: a polishing pad having a polishing surface and a back surface, the polishing surface comprising a pattern of grooves; an aperture disposed in the polishing pad from the back surface through to the polishing surface, wherein a first groove of the pattern of grooves is a circumferential groove continuous with the aperture at a first sidewall of the aperture but discontinuous with a second sidewall of the aperture, and wherein a second groove of the pattern of grooves is continuous with the aperture at the second sidewall; and an adhesive sheet disposed on the back surface of the polishing pad but not in the aperture, the adhesive sheet providing an impermeable seal for the aperture at the back surface of the polishing pad.