Patents by Inventor Hisayoshi Mitoh

Hisayoshi Mitoh 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).

  • Microcapsule containing ultraviolet absorber
    Patent number: 5443909
    Abstract: The present invention provides a heat sensitive recording material comprising a substrate, a recording layer formed over the substrate and containing a colorless or light-colored basic dye and a color acceptor, and a protective layer formed over the recording layer, the recording material being characterized in that microcapsules having an ultraviolet absorber enclosed therein and having substantially no color forming ability are incorporated in the protective layer.Further, the present invention provides microcapsules having an ultraviolet absorber and as required an organic solvent enclosed therein, which have capsule wall film of synthetic resin and mean particle size of 0.1 to 3 .mu.m.
    Type: Grant
    Filed: September 23, 1993
    Date of Patent: August 22, 1995
    Assignee: Kanzaki Paper Manufacturing Co., Ltd.
    Inventors: Ritsuo Mandoh, Takehiro Minami, Katsuhiko Ishida, Hisayoshi Mitoh
  • Heat-sensitive recording material
    Patent number: 5401708
    Abstract: In the heat-sensitive recording material which has on a base sheet a heat-sensitive recording layer containing a colorless or pale colored chromogenic material and a color developer forming a color by reacting with the chromogenic material and a protective layer arbitrarily formed on the recording layer, a water-soluble graft copolymer of a polymer comprising at least one ethylenically unsaturated carboxylic acid unit and silicone is comprised in the recording layer and/or the protective layer.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: March 28, 1995
    Assignee: Kanzaki Paper Mfg. Co., Ltd.
    Inventors: Yoshihiro Shimizu, Takuji Tuji, Ritsuo Mandoh, Hisayoshi Mitoh
  • Heat sensitive recording material using microcapsules containing ultraviolet absorber
    Patent number: 5272127
    Abstract: The present invention provides a heat sensitive recording material comprising a substrate, a recording layer formed over the substrate and containing a colorless or light-colored basic dye and a color acceptor, and a protective layer formed over the recording layer, the recording material being characterized in that microcapsules having an ultraviolet absorber enclosed therein and having substantially no color forming ability are incorporated in the protective layer.Further, the present invention provides microcapsules having an ultraviolet absorber and as required an organic solvent enclosed therein, which have capsule wall film of synthetic resin and mean particle size of 0.1 to 3 .mu.m.
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: December 21, 1993
    Assignee: Kanzaki Paper Manufacturing Co., Ltd.
    Inventors: Ritsuo Mandoh, Takehiro Minami, Katsuhiko Ishida, Hisayoshi Mitoh