Patent ID: 8337277
Filing Date: 2012-12-25
Classification: B24B

Abstract:
1. A polishing pad comprising a polishing surface, a rear surface and a through hole that connects the polishing and rear surfaces together, wherein an end of the through hole closer to the center of the polishing pad is at a distance of no less than 35% of the radius from the center of the polishing pad, the length of the through hole in the direction of the center of the polishing pad is the same as or shorter than the length of the through hole in a direction perpendicular to the direction of the center of the polishing pad, the length of the through hole in the direction of the center'of the polishing pad is no more than 10% of the radius, and the length of the through hole in a direction perpendicular to the direction of the center of the polishing pad is no, more than 12.5% of the radius.