Patents by Inventor Haruo Yoshido

Haruo Yoshido 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).

  • Method for production of cubic boron nitride-containing high-density inorganic composite sintered article
    Patent number: 5132245
    Abstract: A cubic boron nitride-containing high-density inorganic composite is prepared by mixing cubic boron nitride with a powdered inorganic compound capable of forming a rigid sintered article having a density of at least 85% and a Vickers hardness of at least 800, which does not promote the conversion of cubic boron nitride into graphite-type phase boron nitride (hBN). The powder mixture is compressed into a mold, and fired at low pressure of between 1,000-2,000 MPa, at a temperature of not more than 1,500.degree. C., under which conditions the cubic boron nitride does not convert to hBN, but is sufficiently metastable to permit the formation of the high-density inorganic composite.
    Type: Grant
    Filed: April 25, 1991
    Date of Patent: July 21, 1992
    Assignees: Agency of Industrial Science and Technology, Ministry of International Trade and Industry
    Inventors: Haruo Yoshido, Shoichi Kume, Kazutaka Suzuki, Michihide Machida