Patents Represented by Attorney, Agent or Law Firm Colene E. H. Blank
  • Patent number: 6746311
    Abstract: A multi-layered polishing pad for modifying a surface of a workpiece, such as a semiconductor wafer, that reduces the effort, time and cost involved with pad replacement. The polishing pad includes a polishing layer, at least one sub-pad layer adjacent the polishing layer, and an attachment layer interposed between and releasably joining the polishing layer and at least a portion of the at least one sub-pad layer. The at least one sub-pad layer may include a plurality of layers, such as at least one resilient layer, at least one rigid layer, and/or at least one layer that has both rigid and resilient characteristics. The release layer may be interposed between the polishing layer and the sub-pad or between adjacent layers of the sub-pad. Multiple release layers may be included that are interposed between the polishing layer and layers of the sub-pad, as desired.
    Type: Grant
    Filed: January 24, 2000
    Date of Patent: June 8, 2004
    Assignee: 3M Innovative Properties Company
    Inventor: Carl R. Kessel