The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 2010
Filed:
Jun. 02, 2006
Masaru Izawa, Kobe, JP;
Kunio Godo, Kobe, JP;
Yoshihisa Ujita, Wakayama, JP;
Noriko Ujita, Legal Representative, Wakayama, JP;
Takahiro Takano, Wakayama, JP;
Masaru Izawa, Kobe, JP;
Kunio Godo, Kobe, JP;
Yoshihisa Ujita, Wakayama, JP;
Noriko Ujita, legal representative, Wakayama, JP;
Takahiro Takano, Wakayama, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
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.