Patents by Inventor Takeshi Takahara

Takeshi Takahara 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).

  • Red pigment-coated phosphor and method of producing the same
    Patent number: 4209567
    Abstract: A red emitting phosphor having a low luminous reflectance, comprising a rare earth element-based phosphor body activated by europium and a red pigment coated on the phosphor body, is disclosed, the pigment being formed of indium sulfide or of a combination of indium sulfide and an alkali metal sulfate. The phosphor is produced by coating the phosphor body with a complex compound containing of indium sulfide and an alkali metal sulfide, followed by baking in an oxygen containing atmosphere at 400.degree. to 600.degree. C. so as to convert the complex compound into a red pigment consisting of indium sulfide and an alkali metal sulfate.
    Type: Grant
    Filed: November 16, 1978
    Date of Patent: June 24, 1980
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Takeshi Takahara, Susumu Matsuura, Toshio Nishimura, Nobuo Inoue