Patents by Inventor Alfred D. Perkowski

Alfred D. Perkowski 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).

  • Supporting glass sheets
    Patent number: 4159842
    Abstract: In the art of supporting a glass sheet by self-closing metal tongs during the thermal treatment of the glass sheet, wherein the glass sheet is gripped between opposing glass gripping members of said self-closing tongs, the improvement comprising engaging said glass sheet surfaces with glass engaging members composed of a tungsten nickel composite essentially free of cobalt and iron during the thermal treatment.
    Type: Grant
    Filed: January 22, 1976
    Date of Patent: July 3, 1979
    Assignee: PPG Industries, Inc.
    Inventor: Alfred D. Perkowski