Patents by Inventor Robert Antrim

Robert Antrim 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).

  • Method for preventing low-temperature degradation of tetragonal zirconia containing materials
    Patent number: 4853353
    Abstract: A ceramic body has a surface region that contains tetragonal zirconia. The body is partially stabilized with yttria and, optionally, ceria. Substantially the entire surface region is composed of recrystallized tetragonal strain free grains of yttrium oxide zirconium oxide. The content of yttrium in the surface region is substantially the same as the average content of yttrium in the ceramic body, and the surface region is covered with a thin layer of stable tetragonal grains.
    Type: Grant
    Filed: January 25, 1988
    Date of Patent: August 1, 1989
    Assignee: Allied-Signal Inc.
    Inventors: Philip J. Whalen, Franz Reidinger, Robert Antrim