Patents by Inventor Kazuyasu Takazawa

Kazuyasu Takazawa 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: 4294793
    Abstract: Improved method for manufacturing a spherical hollow body are disclosed. The spherical hollow body has a use for a core member for manufacturing a football or a volleyball and is manufactured by cooling a thermoplastic resin contained in a spherical hollow mold which is forcedly circulated along a constant locus simultaneously with the rotary motions on two axes orthogonal to each other.
    Type: Grant
    Filed: February 27, 1980
    Date of Patent: October 13, 1981
    Assignee: Tachikara Kabushiki Kaisha
    Inventor: Kazuyasu Takazawa
  • Patent number: 4239568
    Abstract: A method of manufacturing a ball for use in volleyball or soccer includes the steps of manufacturing a spherical hollow body of a brittle material, sticking cloth strips in an overlapping manner on the spherical hollow body to provide a bag body, cutting a predetermined portion of the bag body to make an opening thereon, collapsing the spherical hollow body in the bag body into pieces, taking the collapsed pieces out of the bag body through the opening, putting a tube having a valve through the opening into the bag body, sticking rubber ribbons on places corresponding to the overlapping portions of the cloth strips, and sticking leather sheets on the rubber ribboned bag body to provide an outer layer for the ball.
    Type: Grant
    Filed: July 7, 1978
    Date of Patent: December 16, 1980
    Assignee: Tachikara Kabushiki Kaisha
    Inventor: Kazuyasu Takazawa