Patents by Inventor Tutomu Kida

Tutomu Kida 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).

  • Hydraulic material composition having high strength
    Patent number: 4915740
    Abstract: A hydraulic material composition having high strength contains a hydraulic material containing as main ingredients an alkaline earth metal oxide and aluminum oxide (Al.sub.2 O.sub.3), ultra-fine particles having a mean particle size smaller by one order or more than that of the hydraulic material, a metal aggregate and a plasticizer.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: April 10, 1990
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Etsuo Sakai, Tutomu Kida, Yasuhito Fushii, Yukio Sasagawa