Patents by Inventor Shigeo Nagasaku
Shigeo Nagasaku 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: 9829127Abstract: The galling resistance of a threaded joint for steel pipes which has a pin with triangular male threads and a box with triangular female threads which threadingly engage with the male threads and an unthreaded sleeve positioned at the end of the box is improved. The unthreaded sleeve is shortened or removed so that the length of the unthreaded sleeve in the axial direction of the box becomes at most ½ (including 0). The shape of the box may be modified by providing a swoosh portion at the end of the box and/or by making the bevel angle at the end of the female threads ±15 degrees of the flank angle of the female threads.Type: GrantFiled: March 19, 2012Date of Patent: November 28, 2017Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masaaki Sugino, Shigeo Nagasaku
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Patent number: 8857857Abstract: A threaded joint for steel pipes having excellent galling resistance, rust preventing properties, and airtightness without using a compound grease comprises a pin and a box each having a threaded portion and an unthreaded metal-to-metal contact portion serving as contact surfaces. The contact surfaces of at least one of the pin and the box are coated with a multi-layered structure comprising, from the bottom, a first layer formed from a first metal or alloy, a second layer formed from a second metal or alloy which is softer than the first metal or alloy, and an uppermost layer of a solid lubricating coating comprising a lubricating powder in an organic or inorganic binder.Type: GrantFiled: March 13, 2009Date of Patent: October 14, 2014Assignees: Nippon Steel & Sumitomo Metal Corporation, Vallourec Oil and Gas FranceInventors: Kunio Goto, Shigeo Nagasaku, Shigeo Onishi, Hiroaki Ikegami
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Patent number: 8800381Abstract: An apparatus 1 for evaluating the performance of a threaded joint for oil country tubular goods using a first steel pipe P1 and a second steel pipe P2 has a base 2 which holds a first steel pipe P1 in an upright position with an upper end of the first steel pipe P1 extending above the base and the remainder partly disposed under ground. A support member 3 mounted on the base 2 extends alongside the first steel pipe P1. A second steel pipe P2 is suspended above the first steel pipe P1 by a suspending mechanism 4. A threaded joint can be connected and disconnected by first and second tongs 5 and 6 which rotate the second steel pipe P2 with respect to the first steel pipe P1. A stabilizer 7 mounted on the support member 3 can limit the radius of gyration of the second steel pipe P2.Type: GrantFiled: September 27, 2012Date of Patent: August 12, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Chiaki Akamatsu, Yasuhiro Yamamoto, Shigeo Nagasaku
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Patent number: 8622091Abstract: A protector which prevents damage to a solid lubricating coating on a threaded portion of a threaded joint when the protector is mounted on a pin or a box of a threaded joint for pipes in which at least one of the pin or the box is lubricated with a solid lubricating coating comprises a tubular member having a threaded portion on its inner or outer peripheral surface which threadingly engages with at least a portion and preferably 3-5 complete threads of the threaded portion provided on the pin or the box to be protected. The thread height H1 of the threaded portion of the protector and the thread height H2 of the complete thread of the pin or the box on which the protector is mounted satisfy H1>H2, and the difference between H1 and H2 [=H1?H2] is larger than the maximum coating thickness at the thread crest of the solid lubricating coating which covers the threaded portion of the pin or the box.Type: GrantFiled: August 14, 2008Date of Patent: January 7, 2014Assignees: Nippon Steel & Sumitomo Metal Corporation, Drilltec Patents & Technologies Company, Inc.Inventors: Yasuhiro Yamamoto, Shigeo Nagasaku, David W. Clem
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Publication number: 20130019690Abstract: An apparatus 1 for evaluating the performance of a threaded joint for oil country tubular goods using a first steel pipe P1 and a second steel pipe P2 has a base 2 which holds a first steel pipe P1 in an upright position with an upper end of the first steel pipe P1 extending above the base and the remainder partly disposed under ground. A support member 3 mounted on the base 2 extends alongside the first steel pipe P1. A second steel pipe P2 is suspended above the first steel pipe P1 by a suspending mechanism 4. A threaded joint can be connected and disconnected by first and second tongs 5 and 6 which rotate the second steel pipe P2 with respect to the first steel pipe P1. A stabilizer 7 mounted on the support member 3 can limit the radius of gyration of the second steel pipe P2.Type: ApplicationFiled: September 27, 2012Publication date: January 24, 2013Inventors: Chiaki AKAMATSU, Yasuhiro Yamamoto, Shigeo Nagasaku
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Patent number: 8276946Abstract: A threaded joint for steel tubes has a contact surface (30) including a threaded portion and a non-threaded metal-to-metal contact portion. The contact surface of at least one of a pin and a box of the joint is coated with a first plating layer (34) made of a Cu—Zn alloy or a Cu—Zn-M1 alloy (wherein M1 is at least one element selected from Sn, Bi, and In). An undercoat (32) of one or both of a Ni plating layer (32a) and a Cu plating layer (32b) and an overcoat of a Sn-M2 alloy plating layer (36) (wherein M2 is one or more elements selected from Bi, In, Ni, Zn, and Cu) may be formed below and above the first layer, respectively. A solid lubricating coating (38a) and a viscous liquid or semisolid lubricating coating (38b) may also be formed atop the plating layer as a lubricating coating (38).Type: GrantFiled: September 1, 2009Date of Patent: October 2, 2012Assignees: Sumitomo Metal Industries, Ltd., Vallourec Mannesmann Oil & Gas FranceInventors: Masanari Kimoto, Kunio Goto, Masaru Takahashi, Kunihiro Fukui, Shigeo Nagasaku, Ryuichi Imai, Shigeo Onishi, Hiroaki Ikegami
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Publication number: 20120235406Abstract: The galling resistance of a threaded joint for steel pipes which satisfies the standards for an API round threaded joint and which has a pin with triangular male threads and a box with triangular female threads which threadingly engage with the male threads and an unthreaded sleeve positioned at the end of the box is improved. The unthreaded sleeve is shortened or removed so that the length of the unthreaded sleeve in the axial direction of the box becomes at most ½ (including 0) of the value specified by the above standards. The shape of the box specified by the above standards may be modified by providing a swoosh portion at the end of the box and/or by making the bevel angle at the end of the female threads ±15 degrees of the flank angle of the female threads.Type: ApplicationFiled: March 19, 2012Publication date: September 20, 2012Applicant: SUMITOMO METAL INDUSTRIES, LTD.Inventors: Masaaki SUGINO, Shigeo NAGASAKU
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Patent number: 8113055Abstract: There is provided a method capable of evaluating a fastening state of a threaded joint that is used as a joint of pipes or tubes such as OCTG with a high degree of accuracy even after being fastened and a method for fastening a threaded joint of pipes or tubes using the evaluating method. The present invention provides a method for evaluating a fastening state of a threaded joint of pipes or tubes including a pin having an external thread part, a metal seal part, and a shoulder part on an outer peripheral surface, and a box having an internal thread part, a metal seal part, and a shoulder part corresponding to each part of the pin on an inner peripheral surface and being fastened with the pin.Type: GrantFiled: September 6, 2007Date of Patent: February 14, 2012Assignees: Sumitomo Metal Industries, Ltd., Vallourec Mannesmann Oil & Gas FranceInventors: Ikuji Hoshino, Masaki Yamano, Shigeo Nagasaku
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Patent number: 8091425Abstract: An ultrasonic testing method relates to a threaded joint of pipes including a pin having an external thread part, a metal seal part, and a shoulder part on an outer peripheral surface, and a box having an internal thread part, a metal seal part, and a shoulder part with the box and pin being fastened together using a lubricant. The method includes transmitting and receiving ultrasonic waves to and from a plurality of locations along an axial direction of the threaded joint in at least one of the internal thread part, the metal seal part, and the shoulder part of the box; detecting echo intensities and reception times of echoes for the plurality of locations; and detecting an abnormal portion in the threaded joint based on a longitudinal axial directional distribution of the echo intensities and longitudinal axial directional distribution of reception times of the echoes.Type: GrantFiled: September 14, 2007Date of Patent: January 10, 2012Assignees: Sumitomo Metal Industries, Ltd., Vallourec Mannesmann Oil & Gas FranceInventors: Ikuji Hoshino, Masaki Yamano, Shigeo Nagasaku
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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: 7997627Abstract: 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).Type: GrantFiled: April 29, 2005Date of Patent: August 16, 2011Assignees: Sumitomo Metal Industries, Ltd., Vallourec Mannesmann Oil & Gas FranceInventors: Masaaki Sugino, Miyuki Yamamoto, Michihiko Iwamoto, Shigeo Nagasaku, Pierre Dutilleul, Gabriel Roussie, 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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Patent number: 7740285Abstract: A threaded joint for steel pipes comprised of a pin (1) and a box (2) each having a threaded portion (1a, 2b) and an unthreaded contact portion (1b, 2a) exhibits adequate leakage resistance and galling resistance when used for makeup of oil country tubular goods with application of a green dope or even without any dope. The threaded joint has a first plating layer of Sn—Bi—Cu alloy plating formed on the contact surface of at least one of the pin (1) or the box (2). The first plating layer may have a second plating layer selected from Sn plating, Cu plating, and Ni plating on its lower side and at least one layer of a lubricating coating, and particularly a solid lubricating coating on its upper side.Type: GrantFiled: February 29, 2008Date of Patent: June 22, 2010Assignees: Sumitomo Metal Industries, Ltd., Vallourec Mannesmann Oil & Gas FranceInventors: Shigeo Nagasaku, Kunio Goto, Shigeo Onishi, Hiroaki Ikegami
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Publication number: 20100107766Abstract: There is provided a method for detecting an abnormal portion (defect, non-adhering portion, and seized portion) lying at a contact region between each part of a pin and each part of a box forming a threaded joint to be used as a joint of pipe or tubes such as OCTG. This invention provides an ultrasonic testing method of a threaded joint of pipes or tubes including a pin having an external thread part, a metal seal part, and a shoulder part on an outer peripheral surface, and a box having an internal thread part, a metal seal part, and a shoulder part corresponding to each part of the pin on an inner peripheral surface and being fastened with the pin by way of a lubricant.Type: ApplicationFiled: September 14, 2007Publication date: May 6, 2010Inventors: Ikuji Hoshino, Masaki Yamano, Shigeo Nagasaku
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Publication number: 20100059986Abstract: A pin-box type threaded joint for steel tubes having a contact surface (30) including a threaded portion and a nonthreaded metal-to-metal contact portion has improved leak resistance, galling resistance, and corrosion resistance particularly to crevice corrosion. The contact surface of at least one of the pin and the box is coated with a first plating layer (34) made of a Cu—Zn alloy or a Cu—Zn-M1 alloy (wherein M1 is at least one element selected from Sn, Bi, and In). Optionally, an undercoat (32) of one or both of a Ni plating layer (32a) and a Cu plating layer (32b) and an overcoat of a Sn-M2 alloy plating layer (36) (wherein M2 is one or more elements selected from Bi, In, Ni, Zn, and Cu) may be formed below and above the first layer, respectively. A solid lubricating coating (38a) and a viscous liquid or semisolid lubricating coating (38b) may also be formed atop the plating layer as a lubricating coating (38).Type: ApplicationFiled: September 1, 2009Publication date: March 11, 2010Inventors: Masanari Kimoto, Kunio Goto, Masaru Takahashi, Kunihiro Fukui, Shigeo Nagasaku, Ryuichi Imai, Shigeo Onishi, Hiroaki Ikegami
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Publication number: 20100038904Abstract: A protector which prevents damage to a solid lubricating coating on a threaded portion of a threaded joint when the protector is mounted on a pin or a box of a threaded joint for pipes in which at least one of the pin or the box is lubricated with a solid lubricating coating comprises a tubular member having a threaded portion on its inner or outer peripheral surface which threadingly engages with at least a portion and preferably 3-5 complete threads of the threaded portion provided on the pin or the box to be protected. The thread height H1 of the threaded portion of the protector and the thread height H2 of the complete thread of the pin or the box on which the protector is mounted satisfy H1>H2, and the difference between H1 and H2 [=H1?H2] is larger than the maximum coating thickness at the thread crest of the solid lubricating coating which covers the threaded portion of the pin or the box.Type: ApplicationFiled: August 14, 2008Publication date: February 18, 2010Inventors: Yasuhiro Yamamoto, Shigeo Nagasaku, David W. Clem
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Publication number: 20090282921Abstract: There is provided a method capable of evaluating a fastening state of a threaded joint that is used as a joint of pipes or tubes such as OCTG with a high degree of accuracy even after being fastened and a method for fastening a threaded joint of pipes or tubes using the evaluating method. The present invention provides a method for evaluating a fastening state of a threaded joint of pipes or tubes including a pin having an external thread part, a metal seal part, and a shoulder part on an outer peripheral surface, and a box having an internal thread part, a metal seal part, and a shoulder part corresponding to each part of the pin on an inner peripheral surface and being fastened with the pin.Type: ApplicationFiled: September 6, 2007Publication date: November 19, 2009Inventors: Ikuji Hoshino, Masaki Yamano, Shigeo Nagasaku
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Publication number: 20090236850Abstract: A threaded joint for steel pipes having excellent galling resistance, rust preventing properties, and airtightness without using a compound grease comprises a pin and a box each having a threaded portion and an unthreaded metal-to-metal contact portion serving as contact surfaces. The contact surfaces of at least one of the pin and the box are coated with a multi-layered structure comprising, from the bottom, a first layer formed from a first metal or alloy, a second layer formed from a second metal or alloy which is softer than the first metal or alloy, and an uppermost layer of a solid lubricating coating comprising a lubricating powder in an organic or inorganic binder.Type: ApplicationFiled: March 13, 2009Publication date: September 24, 2009Inventors: Kunio Goto, Shigeo Nagasaku, Shigeo Onishi, Hiroaki Ikegami
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Patent number: 7494159Abstract: In a threaded joint for steel pipes which are connected by threaded engagement of a pin member having a tapered male thread, a metal seal-forming portion, and a torque shoulder-forming portion on the end of a pipe, and a box member having a tapered female thread, a metal seal-forming portion, and a torque shoulder forming-portion corresponding to these on the end of a pipe, a buttress thread having contact at the load flanks and the thread root surface and gaps at the thread crest surface and the stabbing flanks is mixed in a single joint with a rugged thread having contact at the load flanks and stabbing flanks and having gaps at the thread root surface and thread crest surface.Type: GrantFiled: February 23, 2007Date of Patent: February 24, 2009Assignees: Sumitomo Metal Industries, Ltd., Vallourec Mannesmann Oil & Gas FranceInventors: Masaaki Sugino, Miyuki Yamamoto, Michihiko Iwamoto, Shigeo Nagasaku
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Publication number: 20080217916Abstract: A threaded joint for steel pipes comprised of a pin 1 and a box 2 each having a threaded portion (1a, 2a) and an unthreaded metal contact portion (1b, 2b) exhibits adequate leakage resistance and galling resistance when used for makeup of oil country tubular goods with application of a green dope or even without any dope. The threaded joint has a first plating layer of Sn—Bi alloy plating or Sn—Bi—Cu alloy plating formed on the contact surface of at least one of the pin 1 and the box 2. The first plating layer may have a second plating layer selected from Sn plating, Cu plating, and Ni plating on its lower side and at least one layer of a lubricating coating, and particularly a solid lubricating coating, on its upper side.Type: ApplicationFiled: February 29, 2008Publication date: September 11, 2008Inventors: Shigeo Nagasaku, Kunio Goto, Shigeo Onishi, Hiroaki Ikegami