Patents by Inventor Fumitoshi Niinuma

Fumitoshi Niinuma 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).

  • Patent number: 4844855
    Abstract: A method for producing centrifugally cast concrete product including charging pumpable concrete into a cylindrical form and rotating the form to cast the concrete by a centrifugal force, in which the concrete contains a high water reducing agent, an air entraining agent and an inorganic fine powder, and 5.5 to 18.5% of air content, thereby considerably reducing the amount of discharged sludge and, in turn, the labor and expenses required for the disposal of sludge, while maintaining the strength of the product as same as or greater than that for conventional products, without the need for complex processes.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: July 4, 1989
    Assignee: Onoda Cement Co., Ltd.
    Inventors: Yoshitaka Omori, Kanzi Suzuki, Fumitoshi Niinuma