Patents by Inventor Christine M. Towers

Christine M. Towers 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).

  • X-ray intensifying screen including a titanium activated hafnium dioxide phosphor containing gadolinium to reduce afterglow
    Patent number: 4963753
    Abstract: An intensifying screen is disclosed containing a phosphor composition comprised of monoclinic crystals of a titanium activated hafnia phosphor host containing gadolinium ions to reduce afterglow. A phosphor composition in which zirconia is at least partially substituted for hafnia is also disclosed.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: October 16, 1990
    Assignee: Eastman Kodak Company
    Inventors: Philip S. Bryan, Patrick M. Lambert, Christine M. Towers, Gregory S. Jarrold
  • X-ray intensifying screen including a titanium activated hafnium dioxide phosphor containing samarium to reduce afterglow
    Patent number: 4961004
    Abstract: An intensifying screen is disclosed containing a phosphor composition comprised of monoclinic crystals of a titanium activated hafnia phosphor host containing samarium ions to reduce afterglow. A phosphor composition in which zirconia is at least partially substituted for hafnia is also disclosed.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: October 2, 1990
    Assignee: Eastman Kodak Company
    Inventors: Philip S. Bryan, Patrick M. Lambert, Christine M. Towers, Gregory S. Jarrold
  • Recrystallization of activated rare-earth oxyhalide phosphors
    Patent number: 4311487
    Abstract: A method for the recrystallization of activated rare-earth oxyhalide phosphors is disclosed. The method comprises recrystallizing the phosphor by firing a phosphor-flux mixture in an inert atmosphere. The phosphor-flux is substantially homogeneous and the flux contains substantially dehydrated magnesium halide. One particularly preferred phosphor made by the method is a lanthanum oxychloride phosphor coactivated with bismuth and ytterbium. This phosphor made by the present method has high speed and low afterglow.
    Type: Grant
    Filed: June 11, 1980
    Date of Patent: January 19, 1982
    Assignee: Eastman Kodak Company
    Inventors: George W. Luckey, Christine M. Towers