Patents by Inventor Yoshito Tsumuraya

Yoshito Tsumuraya 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-based ink composition and ballpoint pen using the same
    Patent number: 7473309
    Abstract: Provided are a water-based ink composition characterized by containing 0.01 to 1.0% by weight of high molecular saccharides (trade name: Diutan gum) represented by Formula 1 as an essential component in the ink composition and a ballpoint pen in which an ink reservoir in a main body is charged with the above water-based ink composition.
    Type: Grant
    Filed: August 26, 2004
    Date of Patent: January 6, 2009
    Assignee: Mitsubishi Pencil Co., Ltd.
    Inventor: Yoshito Tsumuraya
  • Water-based ink composition and ball pen employing the same
    Publication number: 20060213392
    Abstract: Provided are a water-based ink composition characterized by containing 0.01 to 1.0% by weight of high molecular saccharides (trade name: Daiyutan gum) represented by Formula 1 as an essential component in the ink composition and a ballpoint pen in which an ink reservoir in a main body is charged with the above water-based ink composition.
    Type: Application
    Filed: August 26, 2004
    Publication date: September 28, 2006
    Applicant: MITSUBISHI PENCIL CO., LTD.
    Inventor: Yoshito Tsumuraya