Patents by Inventor Kazuya Yabuta

Kazuya Yabuta 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 strength high oxidation-resistance sialon sintered body
    Patent number: 4935389
    Abstract: A ceramic material comprising a double phase complex sialon sintered body of .beta.'-type sialon and O'-type sialon being composed of the four elements of Si,Al,O and N and having a ratio of .beta.'-type sailon/O'-type sialon of 7/1 to 3/5 by weight ratio.The .beta.'-phase-O'-phase complex sailon has a dense structure and is excellent in high strength and high oxidation-resistance.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: June 19, 1990
    Assignees: NKK Corporation, Government Industrial Research Institute
    Inventors: Seiki Umebayashi, Kazushi Kishi, Kazuya Yabuta, Hiroaki Nishio
  • Method for molding of powders
    Patent number: 4927600
    Abstract: The invention is concerned with the method of compression molding a metallic or ceramic powders. The method includes the step of maintaining a negative pressure within a first mold of noncompactable powders for intimately contacting on its inner surface a pouch-like member of thin-walled resilient material for producing a second mold, and the step of compactly charging starting powders into the second mold and exhausting air from and sealing the second mold, taking out a pre-molded body of the metallis or ceramic powders together with the second mold and the step of processing the pre-molded body by a cold or hot isostatic press.
    Type: Grant
    Filed: October 8, 1987
    Date of Patent: May 22, 1990
    Assignee: Nippon Kokan Kabushiki Kaisha
    Inventors: Tsuneo Miyashita, Hiroaki Nishio, Kazuya Yabuta, Yoshio Takagi