Patents by Inventor Youji Tukihashi

Youji Tukihashi 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 preparing rare earth oxysulfide phosphor
    Patent number: 5217647
    Abstract: The present invention relates to a method for preparing a rare earth oxysulfide phosphor which comprises baking a mixture containing a rare earth oxide and/or a rare earth compound which becomes a rare earth oxide easily at a high temperature a sulfiding agent and a flux, wherein a rare earth oxysulfide seed is added to the mixture before baking.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: June 8, 1993
    Assignee: Kasei Optonix, Ltd.
    Inventors: Hideo Tono, Youji Tukihashi, Kazuhito Iwasaki