Patents by Inventor Yoshimitsu Sekiguchi

Yoshimitsu Sekiguchi 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).

  • Package of cement mixing material
    Patent number: 5224595
    Abstract: Using a packaging material containing a fibrous substance such as pulp and a carboxyl-containing polymer a substance such as an acid type carboxymethyl cellulose, a cement mixing material such as a superplasticizer is packaged and the package is thrown into a cement formulation such as concrete, mortar or a cement paste in a truck agitator.
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: July 6, 1993
    Assignees: Taisei Corp., Lion Corp.
    Inventors: Kenji Sugimoto, Koichi Nagase, Yoshimitsu Sekiguchi, Toshihiro Okada, Takehiko Kurusu
  • 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