Patents by Inventor Takafumi Naito

Takafumi Naito 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 composition, formed products therefrom and segregation reduction agent for hydraulic substances
    Patent number: 5174821
    Abstract: This invention provides a hydraulic composition which contains a cementitious material in powder form, .beta.-1,3-glucan, and a superplasticizer. The composition makes it possible to prepare concrete with high resistance to segregation, high fluidity, and excellent filling ability. Because of this, vibration of the concrete is not necessary during casting; it can simply be poured.
    Type: Grant
    Filed: April 29, 1992
    Date of Patent: December 29, 1992
    Assignees: Taisei Corporation, Takeda Chemical Industries, Ltd.
    Inventors: Yasunori Matsuoka, Takefumi Shindoh, Kazunao Yokota, Takafumi Naito, Akira Haze, Kiyoshi Nara
  • Concrete structural member and method for manufacture thereof
    Patent number: 4774045
    Abstract: A concrete structural member of improved stability is produced by preparing a concrete composite layer having a concrete layer on one side and an aggregate layer on the other side thereof, impregnating the composite layer with a monomer, thermally or catalytically polymerizing the monomer impregnated in the composite layer, and thereafter placing fresh concrete on the aggregate layer side of the polymer-impregnated composite layer.
    Type: Grant
    Filed: March 10, 1986
    Date of Patent: September 27, 1988
    Assignees: Ozawa Concrete Industry Co., Taisei Corporation
    Inventors: Shizuko Kushida, Takashi Tsubahara, Takafumi Naito, Seiji Kaneko, Yasunori Matsuoka, Takefumi Shindo