Patent ID: 7329174
Filing Date: 2008-02-12
Classification: B24B,B24D

Abstract:
1. A chemical mechanical polishing pad having a polishing surface, a non-polishing surface opposite to the polishing surface and a side surface for defining these surfaces, the polishing surface having at least two groups of grooves, wherein the two groups of grooves consist of (i) a f first group of grooves which intersect a single virtual straight line extending from the center portion toward the peripheral portion of the polishing surface and do not cross one another and (ii) a second group of grooves which extend f from the center portion toward the peripheral portion of the polishing surface, intersect the first group of grooves and do not cross one another, and the grooves of the second group consist of grooves extending from the center portion which is an area surrounded by a circle having a radius of 50 mm from the center of gravity on the polishing surface toward the peripheral portion and not in contact with another groove of the second group in the area of the center portion, and grooves extending from the center portion toward the peripheral portion and in contact with other grooves of the second group in the area of the center portion.