Patent ID: 6875077
Filing Date: 2005-04-05
Classification: B24B,B24D

Abstract:
1. A method of forming an end-point-detection window in a polishing pad for use in chemical mechanical polishing of substrates, said polishing pad having a polishing surface and comprising a porous fibrous matrix made of paper-making fibers, and a binder for binding said paper-making fibers; said fibrous matrix having a working polishing surface and a back, non-working surface, said method comprising: forming an area through said fibrous matrix from said working polishing surface to said back, non-working surface; said step of forming comprising creating in said fibrous matrix a region that is transparent to light beams emanating from a CMP end-point detection device; and filling said region of said step of creating with material that is transparent to light beams emanating from a CMP end-point detection device.