Patents by Inventor Tomoyuki Okazawa

Tomoyuki Okazawa 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).

  • Maleic anhydride copolymer
    Patent number: 5336727
    Abstract: A maleic anhydride copolymer comprising maleic anhydride units (I), conjugated diene units (II) and aliphatic monoolefin units (III) is provided. This copolymer has a weight-average molecular weight of from 500 to 50000. The molar ratio of unit (I)/(unit (II)+unit (III)) ranges from 30/70 to 90/10 and the molar ratio of unit (II)/unit (III) ranges from 5/95 to 90/10. A hydrolyzed product of the copolymer or a water-soluble maleic acid copolymer is also provided. The hydrolyzed product is advantageously used for scale inhibitors, dispersants for calcium carbonate or admixtures for cement and conctrete.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: August 9, 1994
    Assignee: Tosoh Corporation
    Inventors: Tomoyuki Okazawa, Seiichi Tokumaru, Hideo Ohira, Masao Ishii, Yoshiaki Kano