Patents by Inventor Tatsuo Miyagi

Tatsuo Miyagi 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 supervision of injection molding by use of waveform of internal die pressure
    Patent number: 4889667
    Abstract: A method for the supervision of injection molding including monitoring an internal die pressure of molten resin flowing through a resin passageway in a mold to form a monitored waveform; displaying the monitored wavefrom together with a predetermined reference waveform on a display unit such as a CRT, and comparing the monitored waveform with an allowable value of the reference waveform to determine any abnormality caused in a molding process. The injection molding can be supervised with accuracy on the basis of the reference waveform representing the optimum internal die pressure, thereby increasing the quality of molded articles.
    Type: Grant
    Filed: May 21, 1987
    Date of Patent: December 26, 1989
    Assignee: Technoplas Inc.
    Inventors: Hisashi Kojima, Tatsuo Miyagi