Patents by Inventor Eiichi Okabe

Eiichi Okabe 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).

  • Aqueous metallic ink for ball-point pen
    Patent number: 5474603
    Abstract: An aqueous metallic ink for a ball-point pen which is prevented from causing deterioration such as sedimentation of aluminum powder during the storage for a long period of time and which can be continuously used for writing. The ink comprises an aluminum powder, a natural polysaccharide or a dierivative thereof as a thickener, a water-soluble organic solvent and water, and has a viscosity of 100 to 1,500 P (ST rotor of E-type viscometer, 1 rpm, 25.degree. C. ) and a ratio of the viscosity at 1 rpm to that at 10 rpm of at least 3.0.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: December 12, 1995
    Assignee: Pentel Kabushiki Kaisha
    Inventors: Hiroshi Miyashita, Sachiko Matsuda, Eiichi Okabe