Patents by Inventor Masamitu Ishikawa

Masamitu Ishikawa 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).

  • Sintered article of diamond and method for production thereof
    Patent number: 5030596
    Abstract: A sintered article of diamond is obtained by coating the surface of diamond particles with 30 to 0.1% by volume, based on the total volume of the diamond particles and aids, of at least one member selected from the group consisting of the transition metals of Groups 4a, 5a, and 6a in the Periodic Table of Elements and boron and silicon, and sintering the coated diamond particles under conditions of high pressure and high temperature, which sintered article consists of 70 to 99.8% by volume of diamond and 30 to 0.2% by volume of the carbide of the coating substance. A method for the production of the sintered article of diamond is also disclosed.
    Type: Grant
    Filed: December 1, 1989
    Date of Patent: July 9, 1991
    Assignees: Agency of Industrial Science and Technology, Ministry of International Trade and Industry
    Inventors: Shoichi Kume, Haruo Yoshida, Kazutaka Suzuki, Yoshio Tasaki, Shiro Ikuta, Masamitu Ishikawa, Michihide Machida
  • Method for production of a sintered article of diamond
    Patent number: 4902652
    Abstract: A sintered article of diamond is obtained by coating the surface of diamond particles with 30 to 0.1% by volume, based on the total volume of the diamond particles and aids, of at least one member selected from the group consisting of the transition metals of Groups 4a, 5a, and 6a in the Periodic Table of Elements and boron and silicon, and sintering the coated diamond particles under conditions of high pressure and high temperature, which sintered article consists of 70 to 99.8% by volume of diamond and 30 to 0.2% by volume of the carbide of the coating substance. A method for the production of the sintered article of diamond is also disclosed.
    Type: Grant
    Filed: July 8, 1988
    Date of Patent: February 20, 1990
    Assignee: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Shoichi Kume, Haruo Yoshida, Kazutaka Suzuki, Yoshio Tasaki, Shiro Ikuta, Masamitu Ishikawa, Michihide Machida