Patents by Inventor Minori Ishii

Minori Ishii 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).

  • FRP pipe with threaded end joint section
    Patent number: 5213379
    Abstract: A fiber-reinforced plastic pipe with a male-threaded and/or female-threaded end joint section having improved axial strength and thread contour, exhibiting a high degree of seal tightness, and withstanding a high internal pressure. The female threads comprise a first resin layer, a second fiber-reinforced resin layer having continuous filaments extending at an angle of 0.degree..+-.15.degree. to the longitudinal axis of the pipe, and a third fiber-reinforced resin layer having continuous filaments extending at an angle of .+-.85.degree. to 90.degree. to the longitudinal axis. The male threads comprise short fibers flocked in the radial direction on a fiber-reinforced plastic substrate layer and impregnated with a resin.
    Type: Grant
    Filed: November 20, 1990
    Date of Patent: May 25, 1993
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Kunitoshi Taniguchi, Minori Ishii, Masato Ohira