Patent ID: 7306507
Filing Date: 2007-12-11
Classification: B24B,B24D,H01L

Abstract:
1. A method of making a polishing pad, the method comprising: forming a first portion of a polishing pad window, the first portion having a recess and being transparent to white light; inserting a mass of crystalline or glass like material into the recess, the mass being transparent to white light; forming a polishing layer that includes an aperture, the polishing layer having a top surface and a bottom surface, the aperture having a first opening in the top surface and a second opening in the bottom surface, the top surface being a polishing surface; and inserting the window in the aperture, the window being situated in the aperture so that the first portion plugs the aperture and the second portion is on a bottom side of the first portion, wherein the first portion acts as a slurry-tight barrier.