Patent ID: 6752697
Filing Date: 2004-06-22
Classification: B24B

Abstract:
A method, comprising:(a) providing a polishing tool comprised of a polishing pad, a first pad conditioner having a first conditioning surface, and a second pad conditioner having a second conditioning surface, wherein said second conditioning surface is comprised of a material that may be polished off more easily than a material to be polished off said substrate; (b) positioning a substrate in said tool and in contact with said polishing pad; (c) supplying a slurry to at least said polishing pad; (d) providing relative movement between said polishing pad and said substrate; (e) disengaging said first substrate from contact with said pad; (f) urging said second conditioning surface into contact with said polishing pad after disengaging said first substrate from contact with said pad, and providing relative movement between said second conditioning surface and said pad; (g) repeating steps (b)-(f) with additional substrates until such time as a polishing rate of a substrate is less than a predefined value; and (h) after said polishing rate reaches said predefined value, urging said first conditioning surface into contact with said polishing pad and providing relative movement between said first conditioning surface and said pad.