Patent ID: 7959496
Filing Date: 2011-06-14
Classification: B24B

Abstract:
1. A method of polishing a wafer comprising the steps of: providing a wafer carrier comprising a piston plate; providing a flexible membrane assembly comprising a rigid cylinder and a flexible membrane spanning the cylinder to form a pan-like structure; disposing the flexible membrane assembly about the piston plate; translating the wafer carrier relative to a polishing pad while the wafer is held between the flexible membrane and the polishing pad; wherein the cylinder comprises a material selected from the group of ABS plastic, polyethylene terephthalate, polyurethane, polyvinyl chloride, polymethyl methacrylate, polycarbonate; and wherein the membrane comprises a material selected from the group of rubber, synthetic rubber, silicone rubber, nitrile, fluorelastomers, urethane and polyurethane foams, hydrated acrylonitrile butadiene rubber, Vinyl, and thermoplastic elastomer.