Patent ID: 6135865
Filing Date: 2000-10-24
Classification: B24B

Abstract:
A polishing apparatus for polishing a substrate, the polishing apparatus comprising: slurry delivery means for delivering slurry to the apparatus, a porous polishing pad having an upper surface at which the substrate is polished, and a rotating platen upon which the porous pad lies, the platen having a recess, the recess having a first portion in communication with the slurry delivery means for delivering slurry into the first portion, and a second portion extending under the pad, whereby slurry is delivered from the first portion to the second portion and to the upper surface of the pad where the pad aids in the polishing of the substrate, wherein said first portion of the recess is a circular groove formed on an outer edge of the rotating platen and wherein said second Portion is a spiral groove extending therefrom spirally towards a central portion of the rotating platen.