Patents by Inventor Yosimitu Tokunaga

Yosimitu Tokunaga 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: 5482532
    Abstract: The invention provides a method of producing metal powders which is less likely permit variations in cooling rate, ensures rapid solidification at a great cooling rate and readily gives fine particles, and a production apparatus for the method. The method comprises injecting a cooling liquid into a cooling tubular body (1) along an inner peripheral surface thereof to form a cooling liquid layer (9) moving toward a cooling liquid discharge end of the tubular body (1) while swirling along the inner peripheral surface of the tubular body (1); supplying a molten metal (25) to a space (23) inside the cooling liquid layer (9); applying a gas jet (26) as directed toward the cooling liquid layer (9) to the molten metal (25) to divide the molten metal and supply the divided molten metal to the cooling liquid layer (9); and discharging the cooling liquid containing a metal powder solidified in the liquid layer (9) from the cooling liquid discharge end of the tubular body (1) to outside.
    Type: Grant
    Filed: May 5, 1994
    Date of Patent: January 9, 1996
    Assignee: Kubota Corporation
    Inventors: Naotsugu Isshiki, Hiroshi Izaki, Yosimitu Tokunaga, Syoichi Yoshino, Masanori Yoshino, Toshiyuki Aoki
  • Patent number: 5352267
    Abstract: A cooling liquid is injected into and supplied to a cooling tubular body along its inner periphery to form a cooling liquid layer flowing down the inner peripheral surface of the body while revolving. A molten metal is then injected into the cooling liquid layer from the inner peripheral side thereof to divide, rapidly cool and solidify the stream of molten metal with the cooling liquid layer and obtain a metal powder. Since the metal powder is continuously obtained upon flowing down the tubular body along with the cooling liquid, the liquid can be continuously removed from the powder by suitable means, and the power can be subsequently dried continuously.
    Type: Grant
    Filed: September 25, 1992
    Date of Patent: October 4, 1994
    Assignee: Kubota Corporation
    Inventors: Syoichi Yoshino, Hiroshi Izaki, Masanori Yoshino, Fumio Kasai, Yosimitu Tokunaga, Naotsugu Isshiki
  • Patent number: 5180539
    Abstract: A cooling liquid is injected into and supplied to a cooling tubular body along its inner periphery to form a cooling liquid layer flowing down the inner peripheral surface of the body while revolving. A molten metal is then injected into the cooling liquid layer from the inner peripheral side thereof to divide, rapidly cool and solidify the stream of molten metal with the cooling liquid layer and obtain a metal powder. Since the metal powder is continuously obtained upon flowing down the tubular body along with the cooling liquid, the liquid can be continuously removed from the powder by suitable means, and the power can be subsequently dried continuously.
    Type: Grant
    Filed: March 20, 1991
    Date of Patent: January 19, 1993
    Assignee: Kubota Corporation
    Inventors: Syoichi Yoshino, Hiroshi Izaki, Masanori Yoshino, Fumio Kasai, Yosimitu Tokunaga, Naotsugu Isshiki