Patents by Inventor Eva C. Freeman

Eva C. Freeman 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 making thin film electroluminescent rare earth activated zinc sulfide phosphors
    Patent number: 4508610
    Abstract: A method of coactivating a rare earth activated, electroluminescent zinc sulfide film with activator gas is described. The phosphor film is deposited upon a substrate by co-sputtering from a zinc sulfide target and a rare earth target in an atmosphere such as hydrogen, chlorine, fluorine or bromine, and an inert gas.
    Type: Grant
    Filed: February 27, 1984
    Date of Patent: April 2, 1985
    Assignee: GTE Laboratories Incorporated
    Inventors: Eva C. Freeman, Donald H. Baird