Patents by Inventor Hidewo Hatakeyama

Hidewo Hatakeyama 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 of producing extruded plate-like polystyrene foam
    Patent number: 4451417
    Abstract: In a method of producing a plate-like polystyrene resin foam which comprises extruding a molten mixture of a polystyrene resin and a volatile blowing agent from an extruder into a zone kept at a lower pressure than the inside of the extruder, the improvement wherein the volatile blowing agent is a mixture consisting of 50 to 80% by weight of dichlorodifluoromethane and 50 to 20% by weight of ethyl chloride and is present in said molten mixture in a proportion of 8 to 17 parts by weight per 100 parts by weight of the polystyrene resin.
    Type: Grant
    Filed: December 16, 1982
    Date of Patent: May 29, 1984
    Assignee: Japan Styrene Paper Corporation
    Inventors: Hiroyuki Akiyama, Hidewo Hatakeyama, Nobuyoshi Shimoyashiki, Yoshiaki Momose, Fusao Imai