Patents by Inventor Masamitsu Takei

Masamitsu Takei 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).

  • Unbonded PC steel strand
    Patent number: 4776161
    Abstract: An unbonded PC steel strand used for posttensioning concrete comprising a PC steel strand composed of a plurality of stranded wires, a thin transparent lacquer coating on the outer surface of the PC steel strand, the lacquer coating being able to be broken when the PC steel strand is subjected to tension or posttensioning concrete, a filler applied around the lacquer coating, and a synthetic resin sheath covering the lacquer and filler coated PC steel strand. A method of manufacturing the unbond PC steel strand comprising steps of annealing the PC steel strand at a low temperature to remove strain, coating the outer surface of the PC steel strand with lacquer, applying a greaselike corrosion inhibitor to the surface of this lacquer coating, and sheating the coated PC steel strand with an outer synthetic resin sheath.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: October 11, 1988
    Assignee: Kawasaki Steel Corporation
    Inventors: Syuzo Sato, Masamitsu Takei, Shigeo Shoji
  • Unbonded PC steel strand
    Patent number: 4635433
    Abstract: An unbonded PC steel strand used for posttensioning concrete comprising a PC steel strand composed of a plurality of stranded wires, a zinc plated layer on the outer surface of the PC steel strand, a greaselike filler applied around the zinc plated layer, and a synthetic resin sheath covering the zinc and filler coated PC steel strand. A method of manufacturing the unbonded PC steel strand comprising steps of pickling and water washing the PC steel strand, coating the outer surface of the PC steel strand with flux, plating the outer surface of the PC steel strand with zinc, applying a greaselike corrosion inhibitor to the surface of the zinc plated layer and sheathing the PC steel strand with an outer synthetic resin sheath.
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: January 13, 1987
    Assignees: Kawasaki Steel Corporation, Kawatetsu Wire Products
    Inventors: Masamitsu Takei, Shigeo Shoji
  • Process of making plated wire for reinforcing rubber goods
    Patent number: 4304113
    Abstract: An improved wire with an excellent adhesion with rubber is disclosed for reinforcing rubber goods, made by a diffusion process wherein oxides formed on the surface of plated metal during diffusion are removed before drawing.
    Type: Grant
    Filed: September 7, 1979
    Date of Patent: December 8, 1981
    Assignees: Kawasaki Steel Corporation, Kawatetsu Wire Products Company Ltd., The Yokohama Rubber Company Ltd.
    Inventors: Masamitsu Takei, Kunihiko Kataoka, Yoshitaka Udagawa, Shunichi Harada, Kozo Tsunoyama