Patents by Inventor Tsugio Ishida

Tsugio Ishida 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 and apparatus of evaluating mechanical properties of steel
    Patent number: 4719583
    Abstract: In order to evaluate the mechanical properties of steel, empirical equations showing the relationship between each of the tensile strength, yield point and elongation of steel and its hardness, grain size and chemical composition are determined in advance based on experimental results. Then, the hardness, grain size and chemical composition of the steel to be evaluated are determined. The tensile strength, yield point and elongation of the steel to be evaluated are determined by inserting the determined hardness, grain size and chemical composition in the empirical equations. In determining the energy absorbed according to a method of this invention, empirical equations showing the relationship between each of the shelf energy, transition temperature and temperature range of the energy transition region of steel and its hardness, grain size and chemical composition are determined in advance. Then, the hardness, grain size and chemical composition of the steel to be evaluated are determined.
    Type: Grant
    Filed: October 18, 1984
    Date of Patent: January 12, 1988
    Assignee: Nippon Steel Corporation
    Inventors: Hideo Takafuji, Tsugio Ishida, Shoichi Sekiguchi