Patents by Inventor Yoshihiro Tokiya

Yoshihiro Tokiya 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).

  • Method for the preparation of a crystalline thermoplastic resin sheet
    Patent number: 4680157
    Abstract: The invention provides a method for the preparation of a sheet of a crystalline thermoplastic resin, e.g. polypropylene, having excellent transparency and surface properties as well as thermoformability. The inventive method comprises quenching of a molten resin sheet extruded out of a T-die by introducing the same into a slit where cooling water is flowing at a velocity higher than the running velocity of the extruded molten resin sheet and then stretching the thus quenched resin sheet in a stretch ratio in the range from 1.02 to 1.5 times.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: July 14, 1987
    Assignee: Idemitsu Petrochemical Co., Ltd.
    Inventors: Atsushi Fujii, Kazuhisa Kaneda, Yoshihiro Tokiya