Method and apparatus of eddy current monitoring for chemical...

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Reexamination Certificate

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C451S006000, C451S008000, C451S011000, C451S041000

Reexamination Certificate

active

07001242

ABSTRACT:
A polishing system can have a rotatable platen, a polishing pad secured to the platen, a carrier head to hold a substrate against the polishing pad, and an eddy current monitoring system including a coil or ferromagnetic body that extends at least partially through the polishing pad. A polishing pad can have a polishing layer and a coil or ferromagnetic body secured to the polishing layer. Recesses can be formed in a transparent window in the polishing pad.

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