Patents by Inventor Hirokazu Ohkura

Hirokazu Ohkura 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).

  • Tack sheet for ink jet recording
    Patent number: 5882755
    Abstract: A tack sheet for ink jet recording, which comprises an ink jet recording sheet having at least one ink-receiving layer formed on one side of a support and an adhesive layer formed on the other side of the support, and a release sheet integrated thereto to cover the adhesive layer, wherein a cationic polymer is contained or impregnated in at least one of the support and the ink-receiving layer, and the ink jet recording sheet has an internal bond strength of from 120 to 320 g.multidot.cm/cm.sup.2 as measured in a wet state after being immersed in water at 20.degree. C. for 10 seconds, in accordance with TAPPI USEFUL METHODS NO. 403.
    Type: Grant
    Filed: August 12, 1997
    Date of Patent: March 16, 1999
    Assignee: Mitsubishi Paper Mills Limited
    Inventors: Koji Igarashi, Susumo Ogawa, Hirokazu Ohkura, Takashi Kikuchi, Hideaki Senoo
  • Ink jet recording sheet
    Patent number: 5302437
    Abstract: Disclosed is a coat type ink jet recording sheet which has on one side of a support a backcoat layer containing a specific platy inorganic pigment and on another side an ink-receiving layer containing at least one of starch particles, modified starch particles and ethylene-vinyl acetate copolymer resins, and a specific cationic dye fixing agent in such an amount as providing a specific cation charge per unit area of the recording sheet. This ink jet recording sheet is less in curling and cockling in wide ranges of temperature and humidity, improved in runnability on recording apparatuses, high in light resistance and ozone resistance of recorded images and in adhesion of the coating layers, less in blotting of overlapped color ink dots of the recorded images and besides, hardly undergoes yellowing.
    Type: Grant
    Filed: July 21, 1992
    Date of Patent: April 12, 1994
    Assignee: Mitsubishi Paper Mills Limited
    Inventors: Kouji Idei, Masaru Andoh, Hideaki Senoh, Hirokazu Ohkura
  • Heat sensitive recording paper
    Patent number: 5024986
    Abstract: Heat sensitive recording paper having such a thickness distribution that the average amplitude of paper thickness variation, between 0.2-mm and 1.0-mm wavelengths of paper thickness variation, does not exceed 0.5 .mu.m and no distinctive variation peak is present in the above wavelength range.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: June 18, 1991
    Assignee: Mitsubishi Paper Mills Limited
    Inventors: Toru Katsura, Hiroo Kaji, Kenji Hyodo, Hirokazu Ohkura
  • Thermal recording paper
    Patent number: 4992411
    Abstract: There is disclosed a thermal recording paper comprising a support having a roughness index, measured by the method of liquid absorption test on paper and board (Bristow's method) in Japan TAPPI paper pulp test method No. 51-87, of not more than 8 ml/m.sup.2, a thermal recording layer, and an intermediate layer formed therebetween.
    Type: Grant
    Filed: January 12, 1990
    Date of Patent: February 12, 1991
    Assignee: Mitsubishi Paper Mills Limited
    Inventor: Hirokazu Ohkura
  • Heat-sensitive recording material
    Patent number: 4855279
    Abstract: A heat-sensitive recording material containing a special sensitizer in a heat-sensitive recording layer is excellent in thermal response properties and sensitivity.
    Type: Grant
    Filed: November 8, 1988
    Date of Patent: August 8, 1989
    Assignee: Mitsubishi Paper Mills, Limited
    Inventors: Haruhiko Ikeda, Akinori Okada, Hirokazu Ohkura
  • Heat-sensitive recording material
    Patent number: 4837197
    Abstract: A heat-sensitive recording material containing a special sensitizer in a heat-sensitive recording layer formed on a support is excellent in thermal response.
    Type: Grant
    Filed: December 24, 1987
    Date of Patent: June 6, 1989
    Assignee: Mitsubishi Paper Mills, Ltd.
    Inventors: Haruhiko Ikeda, Masahiro Higuchi, Hirokazu Ohkura