Patents by Inventor Masayoshi Aoki

Masayoshi Aoki 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).

  • Apparatus for molding plastic
    Patent number: 4411609
    Abstract: A method of and an apparatus for molding a plastic wherein the injection pressure (transfer pressure) is switched to a holding pressure when the internal pressure of the mold cavity sensed by a pressure sensor reaches a predetermined injection pressure (transfer pressure), to initiate holding of the pressure applied to the cavity. The holding pressure is removed when the internal pressure thereof becomes zero or in accordance with the detection of a predetermined inflection point in the internal pressure which is indicative of a gate sealing point in the mold cavity or is brought to a predetermined value close to zero. The molded articles are of high precision finishes, and conservation of energy and natural resources can be achieved.
    Type: Grant
    Filed: April 17, 1981
    Date of Patent: October 25, 1983
    Assignee: Hitachi, Ltd.
    Inventors: Masaki Yoshii, Hidemi Sato, Aizo Kaneda, Masayoshi Aoki, Hitoshi Yokono, Mitsunori Oka