Patent ID: 6086464
Filing Date: 2000-07-11
Classification: B24B

Abstract:
A chemical mechanical polishing apparatus for polishing a semiconductor wafer used in the fabrication of silicon-based semiconductor devices, said apparatus comprising in combination:a primary polish platen assembly;said primary polish platen assembly including at least a first top cover plate member having a first center hole, a first platen plug, and a first polishing pad;said first platen plug being disposed in said first center hole for completely filling the same so as to eliminate an air pocket;said first polishing pad being secured over said first top cover plate member;a secondary polish platen assembly;said secondary polish platen assembly including at least a second top cover plate member having a second center hole, a second platen plug, and a second polishing pad;said second platen plug being disposed in said second center hole for completely filling the same so as to eliminate an air pocket; andsaid second polishing pad being secured over said second top cover plate member.