Patents Assigned to Speed Fam-IPEC Corp.
  • Patent number: 6238271
    Abstract: An apparatus for the improved polishing or planarizing of workpiece surfaces which includes polishing pad with a plurality of self-cleaning and anti-tracking grooves along the surface of the pad. The self-cleaning grooves uniformly guide slurry and polishing debris radially outward across the surface of the pad while the anti-tracking capability acts to passively reduce the creation of localized wear zones into the polishing surface. Preferably, the grooves define a concentric pattern upon the surface of the pad and have a cross-section that is cut into a compound shape that has both a vertical and sloped surfaces. Other embodiments may include grooves with sloped parallel surfaces formed into spiral or radial patterns.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: May 29, 2001
    Assignee: Speed Fam-IPEC Corp.
    Inventor: Joseph V. Cesna