Abrading – Machine – Rotary tool
Reexamination Certificate
2007-05-15
2009-02-10
Morgan, Eileen P. (Department: 3723)
Abrading
Machine
Rotary tool
C451S287000, C451S398000
Reexamination Certificate
active
07488240
ABSTRACT:
A polishing device includes a polishing pad for polishing a wafer and a polishing head for holding the wafer. The polishing head has a retainer ring for retaining the wafer in the in-plane direction of the wafer, a membrane sheet for pressing the wafer against the polishing pad, and a head body for supporting the retainer ring and the membrane sheet. The retainer ring has a subordinate retainer member having a ring portion and a plurality of fins extending from the ring portion to retain the peripheral surface of the wafer. The subordinate retainer member has a thickness equal to the thickness of the wafer. The membrane sheet has a diameter larger than the wafer, and presses the wafer and the vicinity of the inner edge of the subordinate retainer member.
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Elpida Memory Inc.
Foley & Lardner LLP
Morgan Eileen P.
LandOfFree
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