Patents by Inventor T. Yoshioka

T. Yoshioka 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).

  • A process for making an electroluminescent cell using a ZnS host including molecules of a ternary europium tetrafluoride compound
    Patent number: 5286517
    Abstract: A flat panel display utilizes an array of eletroluminescent cells in which the active layer is of polycrystalline zinc sulfide that is the host for molecules of a ternary europium fluoride compound, advantageously lithium europium tetrafluoride. Each cell includes a pair of electrodes between which are a silicon dioxide barrier layer, sufficiently thin for electrons to tunnel therethrough, the active layer, and a capacitive dielectric layer. Other ternary europium tetrafluoride compounds are described for use as the active layer.
    Type: Grant
    Filed: August 7, 1992
    Date of Patent: February 15, 1994
    Assignee: NEC Research Institute, Inc.
    Inventors: Dawon Kahng, T. Yoshioka