Patents by Inventor Ryouichi Itoh

Ryouichi Itoh 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 and mold for molding prefoamed particulate thermoplastic synthetic resin material
    Patent number: 4333897
    Abstract: This invention relates to a mold for molding prefoamed material of thermoplastic synthetic resin, in which the foamed product is provided with a smoothened superficial skin layer on the overall surface thereof, a beautiful external appearance and a remarkable strength. The mold according to this invention consists of a pair of molds each of which is provided with an internal wall facing to a cavity and an external wall not facing to the cavity, and either one of or each of which is provided with at least one heating chamber including a steam inlet and a steam outlet both of which are mounted in the external wall. And either one of or each of the two molds is provided with a plurality of steam passages and a surface-heating chamber independent thereof both of which are mounted in the internal wall.
    Type: Grant
    Filed: July 16, 1979
    Date of Patent: June 8, 1982
    Assignees: Mitsubishi Petrochemical Company Limited, Daisen Industry Company Limited
    Inventors: Tatsuo Hayashi, Ryouichi Itoh, Tatsumi Tsuji