Patents by Inventor Tomoyuki Tsutsumi

Tomoyuki Tsutsumi 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).

  • Additive composition for cement admixture
    Patent number: 5223036
    Abstract: A cement admixture is disclosed which is capable of inhibiting slump loss without set retardation to hydraulic cement compositions. The admixture is composed of a mixture comprising a copolymer of maleic anhydride and an oxyalkylene containing monomer, lignosulfonic acid or its salts and an anionic surfactant.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: June 29, 1993
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Hideo Koyata, Tomoyuki Tsutsumi