Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Eric Verger0
Miyuki Yamamoto0
Pierre Dutilleul0
Shigeo Nagasaku0
Gabriel Roussie0
Masaaki Sugino0
Michihiko Iwamoto0
Date of Patent
August 16, 2011
0Patent Application Number
111172860
Date Filed
April 29, 2005
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A threaded joint for steel pipes comprises a pin (1) and a box (2). The pin has male thread (11), a sealing surface (13), and a shoulder surface (14) located on the end face of the pin. Correspondingly, the box has female thread (21), a sealing surface (23), and a shoulder surface (24) which can mate or contact with the corresponding portions of the pin. The shoulder surface (14) of the pin (1) is provided at an end face of the pin. The sealing surface (13) of the pin (1) is located on a pipe end side near the male thread (11). A a nose portion (15) is provided on the pin (1) between the sealing surface (13) and the shoulder surface (14), the nose portion (15) being not in contact with a corresponding portion of the box (2).
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