Patents by Inventor Masaaki Onizuka

Masaaki Onizuka 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).

  • Wire electrode type electric discharge machining device with preventable application of external force to its lower arm
    Patent number: 4808786
    Abstract: A wire electrode type electric discharge machining device including a wire electrode confronting a workpiece with a small space therebetween, wherein electric discharge is caused to take place in the small space to machine the workpiece; an upper wire guide for slidably supporting the wire electrode above the workpiece; a lower wire guide for slidably supporting the wire electrode below the workpiece; a driver for supporting and moving the workpiece relative to the wire electrode in the horizontal direction; a lower arm for holding the lower wire guide at a position confronting the upper wire guide means.
    Type: Grant
    Filed: October 7, 1987
    Date of Patent: February 28, 1989
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masaru Shinkai, Makoto Tanaka, Jun Aramaki, Masaaki Onizuka