Patents by Inventor Tokiko Yamashita

Tokiko Yamashita 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).

  • Method for production of particulate polymers
    Patent number: 5041467
    Abstract: This invention relates to a method of producing particulate polymers. This production method is characterized in that a mixture of an isocyanate compound containing two or more isocyanato groups per molecule and a surfactant containing two or more hydroxyl groups per molecule is emulsified and allowed to cure in a dispersing medium which does not dissolve the isocyanate compound without use of a protective colloid. According to the production method of the invention, there occurs no aggregation of polymer particles during and after the curing reaction.
    Type: Grant
    Filed: September 4, 1990
    Date of Patent: August 20, 1991
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Hironori Kataoka, Kazuhito Jinno, Tokiko Yamashita