Patent ID: 7364497
Filing Date: 2008-04-29
Classification: B24B,Y02P

Abstract:
1. A polishing pad for use in chemical mechanical polishing, the polishing pad having a major upper surface, and a major lower surface, main grooves in the major upper surface and separating an upper portion of the pad into a plurality of cells, wherein the main grooves delimit the cells, at least one of the cells consisting of a land portion, and a grooved portion, the grooved portion being substantially enclosed by the land portion and defined by at least one groove in the major upper surface of the pad within the cell, each said at least one groove having a bottom delimited by a surface of the pad which is located intermediate the major upper and lower surfaces of the pad, and a respective slurry hole open to the major lower surface of the pad and extending through the pad to the bottom of the at least one groove defining the grooved portion of each said at least one of the cells, and wherein the at least one groove includes a first major groove intersecting the location to which the respective slurry hole extends in the cell, and a second major groove intersecting the location to which the respective slurry hole extends in the cell, whereby slurry supplied through the slurry hole towards the upper surface of the pad will feed into the major grooves and will be impeded by the land portion from spreading outwardly of the cell.