Patents by Inventor Toshimasa Ishigaki

Toshimasa Ishigaki 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).

  • Cathode ray tube having metal film with holes located on upper and side portions of phosphor areas
    Patent number: 6274976
    Abstract: A cathode ray tube has a metal film formed to cover phosphor areas of a phosphor layer on an inner wall of a panel portion of an envelope. The metal film is formed over an organic film resin applied to the phosphor layer, the organic film resin is baked and removed so that the metal film covers the phosphor layer, and cracks are formed in the metal film in a greater number on side portions of the phosphor areas than on an upper portion of the phosphor areas. This construction results in a cathode ray tube with a metal film that can prevent a blister phenomenon and a reduction in brightness.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: August 14, 2001
    Assignees: Hitachi, LTD, Hitachi Device Engineering Co., LTD
    Inventors: Toshimasa Ishigaki, Masahiro Nishizawa, Fumio Takahashi, Tetsuo Suzuki
  • Method for making a cathode ray tube
    Patent number: 5084225
    Abstract: A method for making a cathode ray tube involves the step of positioning a non-reflective transparent plate in front of a face plate of a tube body with a given space therebetween; a step of filling the space with a resin composition and a step of heating the resin composition filled in the space to harden the composition to bond the tube body and the non-reflective transparent plate to each other. The resin composition is an unsaturated polyester resin composition which comprises an unsaturated polyester having a molecular weight per one unsaturated group of 1000 to 8000 and (1) a polymerizable monomer, a low-temperature hardener and a high-temperature hardener or (2) styrene and/or a derivative thereof and an unsaturated compound having a refractive index of 1.5 or less. This composition can be molded in a short time and forms no strain on hardening and serves as an adhesive for production of the cathode ray tube.
    Type: Grant
    Filed: July 6, 1989
    Date of Patent: January 28, 1992
    Assignees: Hitachi, Ltd., Hitachi Chemical Co., Ltd.
    Inventors: Toshimasa Ishigaki, Yasuhiko Uehara, Fusaji Shoji, Ryoichi Sudo, Etsuji Iwami, Hirohumi Izumi
  • Unsaturated polyester resin composition for cathode ray tube and its use
    Patent number: 4866338
    Abstract: Disclosed is an unsaturated polyester resin composition which comprises an unsaturated polyester having a molecular weight per one unsaturated group of 1000 to 8000 and (1) a polymerizable monomer, a low-temperature hardener and a high-temperature hardener or (2) styrene and/or a derivative thereof and an unsaturated compound having a refractive index of 1.5 or less. This composition can be molded in a short time and forms no strain on hardening and is suitable as an adhesive for production of cathode ray tubes.
    Type: Grant
    Filed: December 3, 1987
    Date of Patent: September 12, 1989
    Assignees: Hitachi, Ltd., Hitachi Chemical Co. Ltd.
    Inventors: Toshimasa Ishigaki, Yasuhiko Uehara, Fusaji Shoji, Ryoichi Sudo, Etsuji Iwami, Hirohumi Izumi