Patents by Inventor Shin Ugai

Shin Ugai 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).

  • Patent number: 11753878
    Abstract: A two-step threaded connection for steel pipe includes an intermediate seal and intermediate shoulders. A pin 2 has an inner male-threaded section 23 and an outer male-threaded section 26. A box 3 has an inner female-threaded section 33 and an outer female-threaded section 36. The pin 2 has a pin intermediate critical cross section PICCS located near an end of the first male-threaded section 23. The box 3 has a box critical cross section BCCS located near an end of the inner female-threaded section 33 and a box intermediate critical cross section BICCS located near an end of the outer female-threaded section 36. The pin 2 and the box 3 satisfy the following relationships: PICCSA+BICCSA>BCCSA, and 0.70?PICCSA/BICCSA?0.95.
    Type: Grant
    Filed: August 7, 2020
    Date of Patent: September 12, 2023
    Assignees: NIPPON STEEL CORPORATION, VALLOUREC OIL AND GAS FRANCE
    Inventors: Keita Inose, Masaaki Sugino, Shin Ugai, Hikari Nakano
  • Patent number: 11415246
    Abstract: The threaded joint includes a pin and a box. The pin includes a taper male thread part, and the box includes a taper female thread part to be engaged with the taper male thread part. The male thread part is divided into a first region on the free end side of the pin, and a second region on the tubular side of the pin along a tube axis direction. The taper ratio of the first region is greater than the taper ratio of the second region. The taper ratio of the first region is greater than the taper ratio of the female thread part. The taper ratio of the second region is equal to or greater than the taper ratio of the female thread part.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: August 16, 2022
    Assignees: NIPPON STEEL CORPORATION, VALLOUREC OIL AND GAS FRANCE
    Inventors: Yoshinori Ando, Shin Ugai, Yousuke Oku
  • Publication number: 20220220813
    Abstract: An object of the present disclosure is to ensure good sealability in a threaded connection for steel pipe of a two-step thread construction including an intermediate seal and intermediate shoulders. The pin 2 includes an intermediate seal section 22, an inner male-threaded section 23, an intermediate shoulder 24, an intermediate seal section 25 and an outer male-threaded section 26. The box 3 includes an intermediate seal section 32, an inner female-threaded section 33, an intermediate shoulder 34, an intermediate seal section 35 and an outer female-threaded section 36. The pin 2 has a pin intermediate critical cross section PICCS located near an end of the first male-threaded section 23. The box 3 has a box critical cross section BCCS located near an end of the first female-threaded section 33 and a box intermediate critical cross section BICCS located near an end of the second female-threaded section 36. The pin 2 and the box 3 satisfy the following relationships: PICCSA+BICCSA>BCCSA, and 0.
    Type: Application
    Filed: August 7, 2020
    Publication date: July 14, 2022
    Inventors: Keita INOSE, Masaaki SUGINO, Shin UGAI, Hikari NAKANO
  • Patent number: 11149881
    Abstract: A threaded connection for steel pipe is provided that prevents galling on the sealing surfaces during make-up while providing high sealing performance after completion of make-up. The pin (10) includes a nose (112) including a pin taper guide surface (112a) and a pin sealing surface (113) including a taper surface (113a). The box (20) includes a nose-receiving portion (22) including a box taper guide surface (22a), a box sealing surface (23) including a taper surface (23a), and a buffer surface (24). The taper angle of the taper surfaces (113a, 23a) includes a second taper angle larger than the taper angle of the taper guide surfaces (112a, 22a). The threaded connection (1) is constructed so as to satisfy Dp2>Db2>Dp1 and Lb2>Lp2. The buffer surface (24), located between the box taper guide surface (22a) and taper surface (23a), has a length of 0.75 mm or larger, and is located outward of an imaginary plane (V) determined along radial directions.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: October 19, 2021
    Assignees: Nippon Steel Corporation, Vallourec Oil and Gas France
    Inventors: Masaaki Sugino, Shin Ugai
  • Publication number: 20200332929
    Abstract: The threaded joint includes a pin and a box. The pin includes a taper male thread part, and the box includes a taper female thread part to be engaged with the taper male thread part. The male thread part is divided into a first region on the free end side of the pin, and a second region on the tubular side of the pin along a tube axis direction. The taper ratio of the first region is greater than the taper ratio of the second region. The taper ratio of the first region is greater than the taper ratio of the female thread part. The taper ratio of the second region is equal to or greater than the taper ratio of the female thread part.
    Type: Application
    Filed: November 29, 2018
    Publication date: October 22, 2020
    Inventors: Yoshinori ANDO, Shin UGAI, Yousuke OKU
  • Patent number: 10774598
    Abstract: A threaded joint is constructed of a pin and a box. The pin includes, in order from an end thereof, a shoulder surface, a nose portion, a first sealing surface, a first male threaded portion, an annular portion, a second sealing surface, and a second male threaded portion. The box includes a shoulder surface, a recessed portion, a first sealing surface, a first female threaded portion, an annular portion, a second sealing surface, and a second female threaded portion. In the threaded joint, in a fastened state, the shoulder surfaces are in contact with each other, the first sealing surfaces are in contact with each other, the second sealing surfaces are in contact with each other, a clearance is provided between the nose portion and the recessed portion, a clearance is provided between the annular portions.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: September 15, 2020
    Assignees: NIPPON STEEL CORPORATION, VALLOUREC OIL AND GAS FRANCE
    Inventors: Keita Inose, Fumio Ota, Shin Ugai, Suguru Yamaguchi, Masaaki Sugino
  • Patent number: 10473241
    Abstract: The load flanks in the male threaded portion of the pin and the load flanks in the female threaded portion of the box have a flank angle of less than 0 degrees. The female threaded portion is divided into, in order from near the seal surface, an incomplete thread section and a complete thread section. In the female threaded portion, over the entire area including the two thread sections, roots collectively define a single tapered periphery. The incomplete thread section has a length of at least three times the thread pitch and has a thread height lower than a thread height of the complete thread section. The shoulder surfaces are in contact with each other, the seal surfaces are in contact with each other, and in the incomplete thread section, clearances are provided between the roots of the male threaded portion and the crests of the female threaded portion.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: November 12, 2019
    Assignees: NIPPON STEEL CORPORATION, VALLOUREC OIL AND GAS FRANCE
    Inventors: Keita Inose, Fumio Ota, Shin Ugai, Masaaki Sugino
  • Publication number: 20190338872
    Abstract: A threaded connection for steel pipe is provided that prevents galling on the sealing surfaces during make-up while providing high sealing performance after completion of make-up. The pin (10) includes a nose (112) including a pin taper guide surface (112a) and a pin sealing surface (113) including a taper surface (113a). The box (20) includes a nose-receiving portion (22) including a box taper guide surface (22a), a box sealing surface (23) including a taper surface (23a), and a buffer surface (24). The taper angle of the taper surfaces (113a, 23a) includes a second taper angle larger than the taper angle of the taper guide surfaces (112a, 22a). The threaded connection (1) is constructed so as to satisfy Dp2>Db2>Dp1 and Lb2>Lp2. The buffer surface (24), located between the box taper guide surface (22a) and taper surface (23a), has a length of 0.75 mm or larger, and is located outward of an imaginary plane (V) determined along radial directions.
    Type: Application
    Filed: December 27, 2017
    Publication date: November 7, 2019
    Inventors: Masaaki Sugino, Shin Ugai
  • Publication number: 20170101830
    Abstract: A threaded joint is constructed of a pin and a box. The pin includes, in order from an end thereof, a shoulder surface, a nose portion, a first sealing surface, a first male threaded portion, an annular portion, a second sealing surface, and a second male threaded portion. The box includes a shoulder surface, a recessed portion, a first sealing surface, a first female threaded portion, an annular portion, a second sealing surface, and a second female threaded portion. In the threaded joint, in a fastened state, the shoulder surfaces are in contact with each other, the first sealing surfaces are in contact with each other, the second sealing surfaces are in contact with each other, a clearance is provided between the nose portion and the recessed portion, a clearance is provided between the annular portions.
    Type: Application
    Filed: June 16, 2015
    Publication date: April 13, 2017
    Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION, VALLOREC OIL AND GAS FRANCE
    Inventors: Keita INOSE, Fumio OTA, Shin UGAI, Suguru YAMAGUCHI, Masaaki SUGINO
  • Publication number: 20160305585
    Abstract: The load flanks in the male threaded portion of the pin and the load flanks in the female threaded portion of the box have a flank angle of less than 0 degrees. The female threaded portion is divided into, in order from near the seal surface, an incomplete thread section and a complete thread section. In the female threaded portion, over the entire area including the two thread sections, roots collectively define a single tapered periphery. The incomplete thread section has a length of at least three times the thread pitch and has a thread height lower than a thread height of the complete thread section. The shoulder surfaces are in contact with each other, the seal surfaces are in contact with each other, and in the incomplete thread section, clearances are provided between the roots of the male threaded portion and the crests of the female threaded portion.
    Type: Application
    Filed: January 9, 2015
    Publication date: October 20, 2016
    Inventors: Keita INOSE, Fumio OTA, Shin UGAI, Masaaki SUGINO
  • Patent number: 9194515
    Abstract: A threaded joint for pipes comprises a pin and a box, each having a threaded and unthreaded portion metal contact surface. The unthreaded metal contact portion includes a sealing surface and a shoulder surface, the shoulder surface of the pin located on the pin end surface. A non-contacting region where the pin and the box do not contact each other exists between the sealing surfaces and the shoulder surfaces of the pin and the box. One or more grooves is formed in at least one of the pin and the box shoulder surfaces and extending to the non-contacting region and to the interior of the joint. At least one of the contact surfaces has a solid lubricating coating exhibiting plastic or viscoplastic rheological behavior. A total volume V (mm3) of the grooves and coating weight W (g) of the solid lubricating coating satisfy the equation V/W?24 (mm3/g).
    Type: Grant
    Filed: January 17, 2013
    Date of Patent: November 24, 2015
    Assignees: NIPPON STEEL & SUMITOMO METAL CORPORATION, VALLOUREC OIL AND GAS FRANCE
    Inventors: Masahiro Oshima, Shin Ugai, Takashi Okada, Masayoshi Sasaki, Suguru Yamaguchi, Masaaki Sugino
  • Publication number: 20150001841
    Abstract: A threaded joint for pipes comprises a pin and a box, each having a threaded and unthreaded portion metal contact surface. The unthreaded metal contact portion includes a sealing surface and a shoulder surface, the shoulder surface of the pin located on the pin end surface. A non-contacting region where the pin and the box do not contact each other exists between the sealing surfaces and the shoulder surfaces of the pin and the box. One or more grooves is formed in at least one of the pin and the box shoulder surfaces and extending to the non-contacting region and to the interior of the joint. At least one of the contact surfaces has a solid lubricating coating exhibiting plastic or viscoplastic rheological behavior. A total volume V (mm3) of the grooves and coating weight W (g) of the solid lubricating coating satisfy the equation V/W?24 (mm3/g).
    Type: Application
    Filed: January 17, 2013
    Publication date: January 1, 2015
    Inventors: Masahiro Oshima, Shin Ugai, Takashi Okada, Masayoshi Sasaki, Suguru Yamaguchi, Masaaki Sugino