Patents by Inventor Ichiro Takeoka

Ichiro Takeoka 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 of manufacturing a cathode ray tube phosphor screen
    Patent number: 5366834
    Abstract: In a cathode-ray tube phosphor, a layer consisting of a substantially uniform SiO.sub.2 film or an organic film consisting essentially of at least one type of a polymer selected from the group consisting of an acrylic resin, gelatin, alginic acid, chitosan, and a urea resin is formed as a first layer on the surface of a phosphor particle, and a layer containing at least one type of a metal selected from the group consisting of Zn, Al, and an alkali earth metal and at least one member selected from the group consisting of a colloidal silica, an alumina sol, and a titania sol each having a particle size of 50 nm or less is formed as a second layer on the first layer. This phosphor is excellent in oxidation resistance and dispersibility.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: November 22, 1994
    Assignee: Nichia Kagaku Kogyo K.K.
    Inventors: Masahiro Yoneda, Shoichi Bando, Ichiro Takeoka
  • Cathode-ray tube phosphor
    Patent number: 5336080
    Abstract: A cathode-ray tube phosphor is manufactured by coating, on the surfaces of phosphor particles, a mixture of a metal alginate containing at least one type of a metal selected from the group consisting of Zn, Al, and an alkali earth metal and at least one type of a water-soluble binder selected from the group consisting of gum arabic, gelatin, polymethacrylamide, and polyvinyl alcohol.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: August 9, 1994
    Assignee: Nichia Chemical Industries, Ltd.
    Inventors: Miyuki Sumitomo, Ichiro Takeoka, Shoichi Bando