Patents by Inventor Takahiro Hamamoto
Takahiro Hamamoto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8287008Abstract: A liquid and gas tight threaded tubular connection includes a first axial abutment surface formed at the free end of an annular lip of a threaded male element and a second axial abutment surface formed at the end of a housing of a threaded female element. The first and second axial abutment surfaces have the same axial half-sections, the inclination of which varies progressively in the radial direction.Type: GrantFiled: July 21, 2006Date of Patent: October 16, 2012Assignees: Vallourec Mannesmann Oil & Gas France, Sumitomo Metal Industries, Ltd.Inventors: Jean-Francois Charvet-Quemin, Jean-Pierre Emery, Takahiro Hamamoto, Masaaki Sugino
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Patent number: 8038179Abstract: A threaded joint for steel pipes comprising a pin 1 having a tapered male thread 11, a tapered sealing surface 13, and an end shoulder surface 14 and a box 2 having correspondingly a tapered female thread 21, a tapered sealing surface 23, and a shoulder surface 24 which is capable of easy tightening and has improved air tightness by the sealing surfaces is arranged such that the pin and the box each have a noncontacting region B where the peripheral surfaces of the pin and the box do not contact each other between the sealing surfaces 13, 23 and the shoulder surfaces 14 and 24. At least a portion of the noncontacting region of the pin adjoining the to end of the pin is a tapered surface portion 18 having substantially the same angle of slope as the tapered sealing surface 13, and the noncontacting region of the box is a substantially cylindrical surface.Type: GrantFiled: March 29, 2010Date of Patent: October 18, 2011Assignees: Sumitomo Metal Industries, Ltd., Vallourec Mannesmann Oil & Gas FranceInventors: Takahiro Takano, Shigeo Nagasaku, Masaaki Sugino, Takahiro Hamamoto, Suguru Yamaguchi
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Patent number: 7900975Abstract: A threaded joint for steel pipes constituted by a pin having male threads and a box having female threads is improved with respect to ease of insertion of the pin and galling resistance of the threaded portions. The stabbing flanks of the threads in a complete thread portion of one of the pin and a box has a two-step stabbing shape having a chamfer. The two-step stabbing shape has a stabbing flank angle ? of 5-45° and a chamfer angle ? of 20-60°. The ratio h/H of the chamfer height h to the thread height H of the pin is 0.25-0.50, or the ratio of the cross-sectional area of the chamfered portion to the overall cross-sectional area of the stabbing flank is made at least a value corresponding to a chamfer height ratio h/H of 0.25 and at most a value corresponding to a chamfer height ratio of 0.50.Type: GrantFiled: October 1, 2009Date of Patent: March 8, 2011Assignee: Sumitomo Metal Industries, Ltd.Inventors: Keiichi Nakamura, Takahiro Hamamoto, Masaaki Sugino, Suguru Yamaguchi
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Patent number: 7823931Abstract: A tubular threaded joint which has excellent resistance to compression and which permits easy tightening operation in the field in a vertical state comprises a pin having a male threaded zone and a box having a female threaded zone. The pin or the box has an end shoulder surface on its end, and the other member has a shoulder surface which abuts against the end shoulder surface. The screw threads of the male threaded zone and the female threaded zone are trapezoidal threads having a crest, a load flank, and a stabbing flank. The lip length, which is the distance in the axial direction of a member having an end shoulder surface between the end shoulder surface and the closest engaged thread to that surface, is at least 140 times the stabbing flank clearance, which is the distance in the axial direction between the stabbing flanks of the male thread and the female thread when the load flanks of the male and female threads contact each other. The stabbing flank of the male thread is preferably chamfered.Type: GrantFiled: September 16, 2008Date of Patent: November 2, 2010Assignees: Sumitomo Metal Industries, Ltd., Vallourec Mannesmann Oil & Gas FranceInventors: Takahiro Hamamoto, Katsutoshi Sumitani, Masaaki Sugino, Michihiko Iwamoto, Miyuki Yamamoto, Jean-Francois Charvet-Quemin, Benoit Le Chevalier, Eric Verger
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Publication number: 20100270793Abstract: A threaded joint for steel pipes comprising a pin 1 having a tapered male thread 11, a tapered sealing surface 13, and an end shoulder surface 14 and a box 2 having correspondingly a tapered female thread 21, a tapered sealing surface 23, and a shoulder surface 24 which is capable of easy tightening and has improved air tightness by the sealing surfaces is arranged such that the pin and the box each have a noncontacting region B where the peripheral surfaces of the pin and the box do not contact each other between the sealing surfaces 13, 23 and the shoulder surfaces 14 and 24. At least a portion of the noncontacting region of the pin adjoining the to end of the pin is a tapered surface portion 18 having substantially the same angle of slope as the tapered sealing surface 13, and the noncontacting region of the box is a substantially cylindrical surface.Type: ApplicationFiled: March 29, 2010Publication date: October 28, 2010Inventors: Takahiro Takano, Shigeo Nagasaku, Masaaki Sugino, Takahiro Hamamoto, Suguru Yamaguchi
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Publication number: 20100078936Abstract: A threaded joint for steel pipes constituted by a pin having male threads and a box having female threads is improved with respect to ease of insertion of the pin and galling resistance of the threaded portions. The stabbing flanks of the threads in a complete thread portion of one of the pin and a box has a two-step stabbing shape having a chamfer. The two-step stabbing shape has a stabbing flank angle ? of 5-45° and a chamfer angle ? of 20-60°. The ratio h/H of the chamfer height h to the thread height H of the pin is 0.25-0.50, or the ratio of the cross-sectional area of the chamfered portion to the overall cross-sectional area of the stabbing flank is made at least a value corresponding to a chamfer height ratio h/H of 0.25 and at most a value corresponding to a chamfer height ratio of 0.50.Type: ApplicationFiled: October 1, 2009Publication date: April 1, 2010Inventors: Keiichi Nakamura, Takahiro Hamamoto, Masaaki Sugino, Suguru Yamaguchi
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Publication number: 20090200798Abstract: A tubular threaded joint which has excellent resistance to compression and which permits easy tightening operation in the field in a vertical state comprises a pin having a male threaded zone and a box having a female threaded zone. The pin or the box has an end shoulder surface on its end, and the other member has a shoulder surface which abuts against the end shoulder surface. The screw threads of the male threaded zone and the female threaded zone are trapezoidal threads having a crest, a load flank, and a stabbing flank. The lip length, which is the distance in the axial direction of a member having an end shoulder surface between the end shoulder surface and the closest engaged thread to that surface, is at least 140 times the stabbing flank clearance, which is the distance in the axial direction between the stabbing flanks of the male thread and the female thread when the load flanks of the male and female threads contact each other. The stabbing flank of the male thread is preferably chamfered.Type: ApplicationFiled: September 16, 2008Publication date: August 13, 2009Inventors: Takahiro Hamamoto, Katsutoshi Sumitani, Masaaki Sugino, Michihiko Iwamoto, Miyuki Yamamoto, Jean-Francois Charvet-Quemin, Benoit Le Chevalier, Eric Verger
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Publication number: 20080265575Abstract: A liquid and gas tight threaded tubular connection. A first axial abutment surface formed at the free end of an annular lip of a threaded male element and a second axial abutment surface formed at the end of a housing of a threaded female element have same axial half-sections, the inclination of which varies progressively in the radial direction. Such a configuration of the axial abutment surfaces optimizes radial thrust exerted on the end of the lip depending on its thickness, to obtain an increased radial interference between the respective sealing surfaces of both elements. Such a connection may find application to hydrocarbon wells, for example.Type: ApplicationFiled: July 21, 2006Publication date: October 30, 2008Applicants: VALLOUREC MANNESMANN OIL & GAS FRANCE, SUMITOMO METAL INDUSTRIES, LTD.Inventors: Jean-Francois Charvet-Quemin, Jean-Pierre Emery, Takahiro Hamamoto, Masaaki Sugino