Patents by Inventor Hatanaka Shigeto

Hatanaka Shigeto 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).

  • Alkenylsuccini acid emulsion sizing agent
    Patent number: 5391225
    Abstract: An alkenylsuccinic acid emulsion sizing agent, wherein said alkenylsuccinic acid emulsion sizing agent has a solid concentration of at least 25% by weight, and comprises active components comprising an alkenylsuccinic acid present in an amount of at least 50 parts by weight, per 100 parts by weight of the total active components in the alkenylsuccinic acid emulsion sizing agent; and, wherein said alkenylsuccinic acid is obtained by dispersing a product prepared by reacting a branched inner olefin having from 9 to 18 carbon atoms with maleic anhydride in water using an amphoteric acrylamide-series polymer.
    Type: Grant
    Filed: October 13, 1993
    Date of Patent: February 21, 1995
    Assignee: Mitsubishi Oil. Co., Ltd.
    Inventors: Hatanaka Shigeto, Hideto Umekawa