Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Reexamination Certificate
2007-07-10
2007-07-10
Heitbrink, Jill L. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
C264S271100
Reexamination Certificate
active
11411077
ABSTRACT:
The present invention provides a method of fabricating a polishing pad having a detection window thereon. A mold having a cavity therein and a transparent thermosetting plastic part that is incompletely hardened are provided. The transparent thermosetting plastic part is disposed in the mold and a high molecular weight foam is injected into the cavity of the mold. The transparent thermosetting plastic part and the high molecular weight foam are hardened at the same time. After the step of demolding is performed, a polishing pad having a detection window thereon is formed. Moreover, the transparent thermosetting plastic part can be designed to have the central portion thicker than its peripheral portion for preventing deformation that is caused by the material difference of the detection window and other portions of the polishing pad.
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patent: 5893796 (1999-04-01), Birang et al.
patent: 6696005 (2004-02-01), Strasbaugh
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patent: 6875077 (2005-04-01), Petroski et al.
patent: 2001/0036805 (2001-11-01), Briang et al.
Chang Yung-Chung
Chu Min-Kuei
Shih Wen-Chang
Wei Lung-Chen
Ditthavong Mori & Steiner, P.C.
Heitbrink Jill L.
I.V. Technologies Co., Ltd.
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