Patent ID: 7131895

Claim:
A polishing pad, comprising: a) a polishing layer configured for polishing at least one of a magnetic, optical and semiconductor substrate in the presence of a polishing medium, the polishing layer having a rotational center and including an annular polishing track concentric with the rotational center and having a width; and b) a plurality of grooves, located in the polishing layer, each traversing the entirety of the width of the annular polishing track and including an extrinsic curvature having at least two discontinuities within the annular polishing track, the at least two discontinuities being in opposite directions from one another and providing an increase and decrease in value of the extrinsic curvature, and having a first direction radially inward of the first discontinuity, a second direction in between the first discontinuity and the second discontinuity, and a third direction radially outward of the second discontinuity, and the change in direction between at least one pair of adjacent directions is from −85 degrees to 85 degrees.