Patents by Inventor Hirosi Yamagisi

Hirosi Yamagisi 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 retarder and rapid hardening cement containing the same
    Patent number: 4190454
    Abstract: A cement retarder is provided which comprises 5 to 20% by weight, based on the weight of said retarder, of gluconic acid and/or tartaric acid and/or a water soluble salt thereof, 30 to 10% by weight, based on the weight of said retarder, of citric acid and/or an alkali salt thereof, and 50 to 85% by weight, based on the weight of said retarder, of an alkali carbonate. A rapid hardening cement is also provided which contains the above cement retarder.
    Type: Grant
    Filed: June 26, 1978
    Date of Patent: February 26, 1980
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Hirosi Yamagisi, Shozo Sakamaki, Koji Nakagawa, Minoru Sirasawa