Patents by Inventor Kuniaki Motoda

Kuniaki Motoda 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 of producing steel pipe material for oil well
    Patent number: 4282047
    Abstract: The method of producing steel pipe material for an oil well is characterized in that, as for the chemical composition of steel, B contained steel is adopted avoiding the addition of Ti which increases the values of non-metallic inclusions to decrease machinability, the value of N is limited to not more than 0.003% to be decreased in content of nitrides, coarse crystal grains due to the decreased content of N are prevented through austenizing of steel under rapid heating, so that such a steel pipe material for an oil well can be obtained that which has resistance to sulfide stress corrosion in addition to satisfactory strength and machinability.
    Type: Grant
    Filed: August 29, 1979
    Date of Patent: August 4, 1981
    Assignee: Kawasaki Steel Corporation
    Inventors: Mitsukuni Yamagata, Keiichiro Takitani, Sadao Hasuno, Kuniaki Motoda