Patent ID: 7300340
Filing Date: 2007-11-27
Classification: B24B

Abstract:
1. A polishing pad, comprising: 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 including a circular polishing surface having a concentric center and an outer periphery; at least one first groove formed in the circular polishing surface; and a groove set formed in the circular polishing surface so as to cross the at least one first groove at least twice so as to define at least one four-sided landing having four curved sides; wherein each of the at least one first groove and the at least one second groove provide the circular polishing surface with a respective circumference fraction grooved from a first location proximate the concentric center to a second location proximate the outer periphery, the respective circumference fraction grooved having an average and remaining within about 25% of the average.