Patents by Inventor Hirohumi Izumi

Hirohumi Izumi 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 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
  • Process for using unsaturated polyester resin composition for treating cathode-ray tubes and cathode tubes obtained thereby
    Patent number: 4893055
    Abstract: A resin composition obtained by adding maleic anhydride to an unsaturated polyester resin composition comprising (I) an unsaturated polyester, (II) a styrene monomer, and (III) at least one polymerizable unsaturated compound, in limited amounts is low in viscosity, excellent in transparency and adhesiveness, able to prevent the generation of surface defects, and thus suitable for treating cathode-ray tubes.
    Type: Grant
    Filed: November 9, 1987
    Date of Patent: January 9, 1990
    Assignee: Hitachi Chemical Co., Ltd.
    Inventors: Tadashi Fuzii, Hirohumi Izumi, Etsuji Iwami, Kazuyuki Tanaka
  • 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