Patents by Inventor Shiro Kitayama

Shiro Kitayama 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).

  • Patent number: 4859415
    Abstract: A method of improving the resistance of oil-well tubular products made of .alpha.-type or (.alpha.+.beta.)-type Ti-based alloys to corrosion in a deep-well environment at high temperatures is disclosed. The method is characterized by adding, as an alloying element, (A) at least one platinum group metal in an amount of 0.02-0.20% by weight, or (B) at least one platinum group metal in an amount of 0.005-0.12% by weight and optionally at least one of Ni, Co, W, and Mo in an amount of 0.05-2.00% by weight.
    Type: Grant
    Filed: October 29, 1987
    Date of Patent: August 22, 1989
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Yoshiaki Shida, Shiro Kitayama, Tomio Nishikawa