Patents by Inventor Hidetoshi Shigetoh

Hidetoshi Shigetoh 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: 5088735
    Abstract: A golf club shaft is produced by winding a plurality of material layers around a mandrel which is finally removed. The layers include an inner layer, an intermediate layer and an outer layer. The inner layer is formed of a cloth prepreg which is cut out so that its fibers have angles of about .+-.45.degree.. The cloth prepreg is wound around the mandrel. The inner layer may be formed of sheets formed of fibers which extend in a single orientation and have a high strength and a high modulus. The sheets are cut out with angles of .+-.30.degree. to .+-.45.degree.. The intermediate layer is formed of a uni-directional sheet formed of fibers extending in a single orientation, the intermediate layer being wound around an outer periphery of the inner layer.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: February 18, 1992
    Assignee: Ryobi Limited
    Inventor: Hidetoshi Shigetoh
  • Patent number: 5071687
    Abstract: A fishing rod, golf club shaft or the like is produced by a laminated tube, which is formed by winding a prepreg formed of a fiber reinforced sheet around an outer periphery of the mandrel which has cylindrical configuration and is removed after the formation of the laminated tube body. A first winding material wound around either one of the inner, intermediate, and outer portions of the laminated tube body in spiral or twill form with suitable pitches and a second winding material having a good adhesive property with respect to the thermosetting or thermoplastic resin is wound around an outer periphery of the first winding material, the second winding material being composed of yarns or mono-filament of organic or inorganic fiber having a good adhesive property with respect to said resin. The first winding material is wound around the laminated tube body while winding the second winding material around the first winding material.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: December 10, 1991
    Assignee: Ryobi Limited
    Inventor: Hidetoshi Shigetoh
  • Patent number: 5028464
    Abstract: A golf club shaft comprises a laminated tube constituting a main body of the shaft which is wound around the outer periphery of a mandrel, a transparent metallic layer wound around the outer periphery of the laminated tube and a resin coat such as epoxy resin formed on the outer periphery of the transparent metallic layer. The laminated tube is composed of a plurality of cloth prepreg sheets having different fiber orientations when wound around the mandrel. The transparent metallic layer is composed of a cloth prepreg sheet and a metallic surface. The cloth prepreg sheet is formed of a cloth of organic and/or inorganic fibers, which is made transparent after molding treatment, and formed by plating or depositing, on one surface of the cloth, metal such as titanium or the like and by impregnating epoxy resin or other thermosetting or thermoplastic resin into the thus formed cloth.
    Type: Grant
    Filed: October 3, 1989
    Date of Patent: July 2, 1991
    Assignee: Ryobi Limited
    Inventor: Hidetoshi Shigetoh
  • Patent number: D327309
    Type: Grant
    Filed: March 2, 1989
    Date of Patent: June 23, 1992
    Assignee: Ryobi Ltd.
    Inventor: Hidetoshi Shigetoh