System for endpoint detection with polishing pad

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Reexamination Certificate

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C451S041000, C451S285000

Reexamination Certificate

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07429207

ABSTRACT:
A method of forming a polishing pad with a polishing layer having a polishing surface and a back surface. A plurality of grooves are formed on the polishing surface, and an indentation is formed in the back surface of the polishing layer. A region on the polishing surface corresponding to the indentation in the back surface is free of grooves or has shallower grooves.

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