Patents by Inventor Tokuya Ohata

Tokuya Ohata 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).

  • Water-soluble dye composition and recording liquid containing the same
    Patent number: 4765838
    Abstract: A black recording liquid suitable for use in ink-jet recording or as an ink for writing instruments comprises at least two water-soluble dyes and a liquid medium. Each of the dyes satisfies the condition defined by the following expression [I], and a mixture of these dyes satisfies the condition defined by the following expression [II]. ##EQU1## In these expressions, a* and b* are chromaticness indices defined in the CIE 1976 (L*, a*, b*) space, i indicates the ith dye of the dyes used together, and n is an integer of 2 or more.
    Type: Grant
    Filed: August 11, 1986
    Date of Patent: August 23, 1988
    Assignees: Mitsubishi Chemical Industries Ltd., Canon Kabushiki Kaisha
    Inventors: Tokuya Ohata, Masatsune Kobayashi, Yuko Suga, Konoe Miura, Hiroshi Takimoto, Tomio Yoneyama