Patents by Inventor Mitsuhiko Furusawa

Mitsuhiko Furusawa 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).

  • Erasable writing ink composition
    Patent number: 5621021
    Abstract: The present invention provides an erasable writing ink composition which can be erased with an eraser after writing. The erasable writing ink composition of the present invention comprises 2 to 50% by weight of a resin selected from the group consisting of styrene-butadiene rubber and an acrylonitrile-butadiene rubber having a film-forming temperature of 0.degree. C. or less or a glass transition temperature of 0.degree. C. or less, 0 to 5% by weight of a surface active agent, 1 to 50% by weight of colored spherical fine particles and 20 to 97% by weight of water.
    Type: Grant
    Filed: January 28, 1993
    Date of Patent: April 15, 1997
    Assignee: Mitsubishi Pencil Kabushiki Kaisha
    Inventors: Koji Yoshioka, Yasuaki Ogiwara, Mitsuhiko Furusawa, Kyoko Kobayashi
  • Aqueous ink composition
    Patent number: 5522922
    Abstract: An aqueous ink composition comprising a dye, water and a pH adjustor in which all the components except the pH adjustor are food additives or conformed materials and the pH adjustor is cosmetic triethanolamine as described in the Japanese Standards of Cosmetic Ingredients (Yakuji Nippo, Ltd., second edition).
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 4, 1996
    Assignee: Mitsubishi Pencil Kabushiki Kaisha
    Inventors: Mitsuhiko Furusawa, Kaname Masugi