Patent ID: 7497763

Claim:
A process of polishing comprising: providing a polishing pad comprising: a first layer comprising: a first polishing surface; and a first opening extending through the first layer; a second layer distinct from and adjacent to the first layer, wherein the second layer comprises: a pad attaching surface; and a second opening extending through the second layer, the second opening substantially contiguous with the first opening of the first layer; wherein a first perimeter of the first opening has a different cross-section size than a second perimeter of the second opening; and a pad window lying within the first opening, the pad window comprising: a second polishing surface substantially contiguous with the first polishing surface of the first layer, and lying in substantially a same plane as the first polishing surface; and an opposing surface opposite the second polishing surface, and designed to abut an exterior surface of a platen window; attaching the pad to a platen so that the pad window and platen window abut; applying a fluid to the first polishing surface, wherein the polishing pad is attached to a platen; placing a workpiece adjacent to the polishing pad; compressing the polishing pad between the workpiece and the platen; and polishing the workpiece such that the pad window contacts the workpiece.