Patent ID: 6413151
Filing Date: 2002-07-02
Classification: B24B,B24D

Abstract:
An arrangement for polishing a semiconductor wafer with (i) a polishing pad having a first diameter and (ii) a slurry disposed on said polishing pad, comprising:a polishing table having a surface configured to receive said polishing pad, said polishing table having a second diameter which is less than said first diameter of said polishing pad so that when said polishing pad is positioned on said surface a peripheral edge of said polishing pad extends outwardly beyond a peripheral side wall of said polishing table; and a ring shaped trough defined by an inner side wall, an outer side wall and a bottom wall connecting the inner side wall and the outer side wall, wherein the outer side wall has a first length and the inner side wall has a second length, said inner side wall of said trough being disposed adjacent said peripheral side wall of said polishing table whereby said outer side wall of said trough extends above said surface of said polishing table, so that when said polishing pad is positioned on said surface of said polishing table, and said polishing table and said polishing pad are rotated, said slurry is advanced from said polishing pad into said trough.