Patents by Inventor William R. Krall, Jr.

William R. Krall, Jr. 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).

  • Apparatus and method for tempering glass sheets
    Patent number: 8234883
    Abstract: A method of tempering a glass sheet heated to a tempering temperature includes cooling the glass sheet at a first heat transfer coefficient at a first quench station and cooling the glass sheet at a second heat transfer coefficient at a second quench station downstream of the first quench station. The second heat transfer coefficient is greater than the first heat transfer coefficient. In a multistage process of the invention, a plurality of quench stations could be used with each downstream quench station having a larger heat transfer coefficient than the previous upstream quench station.
    Type: Grant
    Filed: November 29, 2005
    Date of Patent: August 7, 2012
    Assignee: PPG Industries Ohio, Inc.
    Inventors: William R. Krall, Jr., William R. Siskos, Thomas M. Sailock, Joseph Medzius, DeWitt W. Lampman