Patent ID: 8062103
Filing Date: 2011-11-22
Classification: B24B,Y10S

Abstract:
1. A polishing pad useful for polishing at least one of a magnetic, optical and semiconductor substrate in the presence of a polishing medium with a polishing pad, the polishing pad comprising: a center, an inner region surrounding the center, a transition region connecting grooves from the inner region to an outer region surrounding the inner region, the outer region having multiple grooves, the multiple grooves having a high-rate path, at least fifty percent of the high-rate path being within twenty percent of a groove trajectory φ(r) in polar coordinates referenced to the concentric center of the polishing pad and defined in terms of (1) the distance R between the concentric center of the polishing pad and the rotational center of the substrate being polished, (2) the radius R the transition region being adjacent the outer region and within a radius from the center defined as follows: and wherein the inner region originates continuous grooves that extend uninterrupted to the outer region.