Patents by Inventor Noriko Ujita, legal representative

Noriko Ujita, legal representative 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).

  • Surface conditioning prior to chemical conversion treatment of a steel member
    Patent number: 7666266
    Abstract: By subjecting a threaded joint for OCTG (oil country tubular goods) to surface conditioning with an aqueous solution of potassium tetraborate or sodium tetraborate prior to manganese phosphate chemical conversion treatment, a manganese phosphate chemical conversion coating having coarse crystal grains with an average crystal grain diameter of 10-110 micrometers is formed on the surface of the steel member which may be any steel including a high Cr steel. This manganese phosphate chemical conversion coating can hold a large amount of a liquid lubricant, and it is effective at preventing the occurrence of galling at the time of makeup of a threaded joint for OCTG.
    Type: Grant
    Filed: June 2, 2006
    Date of Patent: February 23, 2010
    Assignee: Sumitomo Metal Industries, Ltd.
    Inventors: Masaru Izawa, Kunio Godo, Yoshihisa Ujita, Noriko Ujita, legal representative, Takahiro Takano