Patents by Inventor Syuzi Yazu

Syuzi Yazu 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).

  • High hardness sintered compact and process for producing the same
    Patent number: 4828611
    Abstract: Herein is disclosed a high hardness sintered diamond compact and a process for the production of the same.The high hardness sintered diamond compact comprises 80 to 95% by volume of diamond particles, 0.5 to 5% by volume of a carbide particles selected from a group consisting of WC and (Mo,W)C and having a diameter not larger than 1 micron, and 4.5 to 15% by volume of an iron group metal, at least 95% by volume of said diamond particles having a diameter from 0.1 to 2 micron and the remainder of the diamond particles being particles having a diameter smaller than 0.1 micron.The ratio by volume of the amount of the diamond particles having a diameter from 1 to 2 micron to that of the diamond particles having a diameter from 0.1 to 1 micron ranges from 4 to 1.The high hardness sintered diamond compact according to the present invention is preferably usable as a drawing die for drawing a high hardness plated-steel wire and as a tool bit.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: May 9, 1989
    Assignee: Sumitmo Electric
    Inventors: Tetsuo Nakai, Syuzi Yazu, Keizo Asai, Yoshiaki Kumazawa