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US Patent 7255374 Threaded tube joint

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Is a

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Patent attributes

Patent Jurisdiction

United States Patent and Trademark Office

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Patent Number

Patent Inventor Names

Tatuso Ono0

Rita G. Toscano0

Hisao Nakamura0

Gabriel Carcagno0

Tommaso Coppola0

Date of Patent

August 14, 2007

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Patent Application Number

106549140

Date Filed

September 5, 2003

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Patent Citations Received

US Patent 12129533 Ultra-fine grained steels having corrosion- fatigue resistance

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US Patent 11833561 Method of manufacturing a coiled tubing string

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US Patent 11952648 Method of forming and heat treating coiled tubing

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Patent Primary Examiner

0

Patent abstract

A threaded tube joint for oil extraction industry has a trapezoidal thread and a toroidal sealing surface (11) placed at its end near the thread and engages, for sealing, a corresponding frusto-conical sealing surface (12) wherein the toroidal sealing surface (11) has a radius Rs value comprised within the range given by the formula

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