Patents by Inventor Shiro Tojo

Shiro Tojo 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 manufacturing molded resin foam and apparatus therefor
    Patent number: 5248459
    Abstract: A method of manufacturing a molded resin foam by charging pre-expanded resin pellets into a cavity of a mold and subjecting them to expansion molding. In order to minimize differences in weight of the foam from product to product, the method is characterized in that prior to charging, the apparent density of the pre-expanded resin pellets is measured and, upon charging, the cracking width of the mold is regulated, on the basis of the measurement result, to a definite value determined depending upon the apparent density, whereby the weight of the pellets charged in the mold cavity is made constant.
    Type: Grant
    Filed: July 23, 1991
    Date of Patent: September 28, 1993
    Assignee: Kanegafuchi Chemical Industry Co., Ltd.
    Inventors: Yukio Fukasawa, Hisatoshi Fukui, Shiro Tojo