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:
Mar. 22, 2005
Filed:
Jul. 25, 2002
Applicants:
Kunio Goto, Kobe, JP;
Shigeo Nagasaku, Nishinomiya, JP;
Hideo Yamamoto, Takarazuka, JP;
Inventors:
Assignees:
Sumitomo Metal Industries, Ltd., Osaka, JP;
Vallourec Mannesmann Oil & Gas France, Aulnoye-Aymeries, FR;
Primary Examiner:
Int. Cl.
CPC ...
F16L035/00 ;
U.S. Cl.
CPC ...
Abstract
A lubricating coating composition in which at least one basic lubricant selected from a basic sulfonate, a basic salicylate, and a basic phenate is dissolved in a volatile solvent is applied to the frictional surface of a box and a pin constituting a threaded joint for oil well pipes. The composition may further contain one or more of a thermoplastic resin powder, another lubricant, and an extreme pressure agent. The surface roughness of the frictional surfaces preferably has an Rmax in the range of 5-40 micrometers.