Patents by Inventor Shigeji Hasegawa

Shigeji Hasegawa 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: 5160135
    Abstract: A stick has a shaft and a blade interal with the shaft. The blade is attached at each of both surfaces of a wooden core material thereof with at least a fiber reinforced plastic plate, respectively, so as to form a pair of puck-striking surfaces. A soft thin film is provided between the plate and the core. The stick is characterized in that at least one of the plurality of fiber reinforced plastic plates has fibers paralleled in one direction and that the blade is provided at an area thereof equivalent to at least a half of the entire length thereof from the tip of a toe thereof with the wooden core material having grains oriented in the direction intersecting with the direction of fibers of the fiber reinforced plastic plate.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: November 3, 1992
    Assignee: Hasegawa Kagaku Kogyo Kabushiki Kaisha
    Inventor: Shigeji Hasegawa
  • Patent number: 4291876
    Abstract: A racket frame formed of a frame core and FRP sheets adhered to ball-striking faces of the frame core. The present racket frame is so constructed such that each of the FRP sheets is made by slicing a laminated body consisting of a plurality of FRP plate elements and protective plates which laminated body is molded into the same configuration as that of the ball-striking faces of the frame core, each of the FRP plate elements is formed by long, continuous reinforcing rovings extending from one end to the other end of the plate element and being uniformly impregnated into the thermosetting resin under uniform tension, and said protective plates are arranged at the innermost and outermost sides of the molded laminated body.
    Type: Grant
    Filed: February 13, 1980
    Date of Patent: September 29, 1981
    Assignee: Hasegawa Chemical Industry Co., Ltd.
    Inventor: Shigeji Hasegawa