Patents by Inventor Steven J. Pufka

Steven J. Pufka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Curved grooving of polishing pads
    Patent number: 7234224
    Abstract: A method is provided for forming grooves in a polishing pad useful for planarizing a substrate in a chemical mechanical planarization process. The method maintains average velocity as a function of bit diameter to enable groove formation using a rotating bit, whereby grooves can be formed at a higher rate while maintaining high groove quality and low defectivity.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: June 26, 2007
    Assignee: Rohm and Haas Electronic Materials CMP Holdings, Inc.
    Inventors: Steven Naugler, Steven J. Pufka, Jeffrey R. Stack, Weitung Wang
  • Polypropylene blown film
    Patent number: 5641848
    Abstract: Disclosed is a blown film or sheet material comprising a broad molecular weight distribution propylene polymer material having a molecular weight distribution M.sub.w /M.sub.n of about 4 to about 60, a melt flow rate of about 0.5 to about 50 dg/min, and xylene insolubles at 25.degree. C. of greater than or equal to 94%. A mixture of the broad molecular weight distribution propylene polymer material and a heterophasic olefin polymer composition can also be used.
    Type: Grant
    Filed: July 24, 1995
    Date of Patent: June 24, 1997
    Assignee: Montell North America Inc.
    Inventors: James M. Giacobbe, Steven J. Pufka