Patents by Inventor Paul G. Spencer

Paul G. Spencer 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).

  • Silica glass crucible
    Patent number: 7118789
    Abstract: A silica glass crucible is manufactured by introducing into a rotating crucible mold bulk silica grain to form a bulky wall including a bottom wall and a side wall. After heating the interior of the mold to begin to fuse the bulk silica grains, an inner silica grain, doped with aluminum, is introduced. The heat at least partially melts the inner silica grain, allowing it to fuse to the wall to form an inner layer. The crucible is cooled, the fused silica grains forming nuclei of crystalline silica within the inner layer.
    Type: Grant
    Filed: July 16, 2001
    Date of Patent: October 10, 2006
    Assignee: Heraeus Shin-Etsu America
    Inventors: Katsuhiko Kemmochi, Robert O. Mosier, Paul G. Spencer
  • Silica glass crucible
    Publication number: 20040072007
    Abstract: A silica glass crucible is disclosed comprising an aluminum-doped inner wall layer. An aluminum-doped layer can be formed on an outer wall portion. The inner layer is non-homogeneously doped with aluminum to promote silica crystallization. The non-homogeneous silica grain mixture contains aluminum and can be aluminum-doped and aluminum-free silica grains or, alternatively, aluminum-coated coarse quartz grain.
    Type: Application
    Filed: October 1, 2003
    Publication date: April 15, 2004
    Applicant: Heraeus Shin-Etsu America
    Inventors: Katsuhiko Kemmochi, Robert O. Mosier, Paul G. Spencer
  • Silica glass crucible
    Publication number: 20030012898
    Abstract: A silica glass crucible is disclosed comprising an aluminum-doped inner wall layer. An aluminum-doped layer can be formed on an outer wall portion. The inner layer is non-homogeneously doped with aluminum to promote silica crystallization. The non-homogeneous silica grain mixture contains aluminum and can be aluminum-doped and aluminum-free silica grains or, alternatively, aluminum-coated coarse quartz grain.
    Type: Application
    Filed: July 16, 2001
    Publication date: January 16, 2003
    Applicant: HERAEUS SHIN-ETSU AMERICA
    Inventors: Katsuhiko Kemmochi, Robert O. Mosier, Paul G. Spencer