Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
February 8, 2011
Patent Application Number
11390336
Date Filed
March 28, 2006
Patent Primary Examiner
Patent abstract
A threaded joint for steel pipes for use in an oil well which has enhanced galling resistance and which is protected from rusting comprises a pin and a box each having a contact surface including a threaded portion and an unthreaded metal contact portion. The contact surface of at least one of the pin and the box has a lower layer of a viscous liquid or semisolid lubricating coating comprising at least wax and a fatty acid alkaline earth metal salt and not containing a harmful heavy metal such as lead and an upper layer of a dry solid coating formed from an aqueous resin coating composition, an organic solvent type coating composition, or an ultraviolet curing coating composition.
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