Patent ID: 7004822

Claim:
A chemical mechanical polishing and pad dressing method, comprising: dressing a polishing pad by rotating a pad dresser against a rotating polishing pad, the rotating polishing pad rotating in a first rotational direction; dispensing a slurry onto the polishing pad; reversing the rotation of the rotating polishing pad, so that the rotating polishing pad rotates in a second rotational direction opposite the first rotational direction; and chemically mechanically polishing a wafer by rotating the wafer against the rotating polishing pad, while the rotating polishing pad rotates in the second rotational direction wherein the rotational combinations I, III, V–VIII, and X–XIII are defined as Polishing Pad Dressing Rotational Polishing Polishing Combination Pad Head Pad Dresser I +30 +30 +31 +31 III +30 +30 +31 +30 V +30 +31 +31 +31 VI +30 +31 +30 +31 VII +30 +31 +31 +30 VIII +31 +30 +30 +30 X +31 +30 +30 +31 XI +31 +30 +31 +30 XII +31 +31 +30 +30 XIII +31 +31 +30 +31 wherein “+” refers to clockwise rotation and “−” refers to counterclockwise rotation.