Patents by Inventor Shigeyuki Ueda

Shigeyuki Ueda 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).

  • Cement dispersion agent
    Patent number: 4786331
    Abstract: A cement dispersion agent comprising calcium polystyrene sulfonate having a weight average molecular weight of 5,000 to 50,000 and having a sulfonation degree of 80% or more. Further, a cement dispersion agent comprising (a) a polystyrene sulfonate and (b) at least one component selected from the group consisting of hydroxycarboxylic acids, ketocarboxylic acids, and the salts thereof.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: November 22, 1988
    Assignee: Lion Corporation
    Inventors: Shigeyuki Ueda, Yoshimitsu Sekiguchi, Kazuaki Yamaguchi