Patents Assigned to Oyo Rubber Chemical Industry Co., Ltd.
  • Patent number: 4463951
    Abstract: The invention provides a ball for a game having a spherical soft polyurethane foam and a surface layer of foamed polyvinyl chloride formed on the surface of the spherical body. The ball is produced by first casting the surface layer in a mold to form a hollow foamed PVC body having closed cells, and then charging a foamed polyurethane composition into the hollow thus formed, to produce a sphere of polyurethane having open cells within the surface layer. Also provided is a ball for games having a spherical body of foamed polyvinyl chloride and having a spherical cavity at the center. The ball is safe, has proper flexibility, and is not subject to punctures.
    Type: Grant
    Filed: March 9, 1982
    Date of Patent: August 7, 1984
    Assignee: Oyo Rubber Chemical Industry Co., Ltd.
    Inventors: Sadao Kumasaka, Satomi Tada