Patents by Inventor Takakazu Tsuchifuji

Takakazu Tsuchifuji 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).

  • Patent number: 4379684
    Abstract: Press for powder metallurgy and method of simultaneous compression of powder in a die disclosed which includes descent speed differentially control apparatuses for simultaneous compression powder in the die from both the upper and lower direction by an upper punch and a lower punch. The descent speed of an upper ram is transferred to the upper punch at that speed, and the speed is changed to lower speed through the control device than the upper punch speed and the controlled lower speed is transferred to a die holder which is simultaneously descended with the controlled lower speed together with the high speed upper punch.
    Type: Grant
    Filed: June 11, 1981
    Date of Patent: April 12, 1983
    Assignee: Yoshizuka Seiki Co., Ltd.
    Inventors: Takeshi Katagiri, Takakazu Tsuchifuji