Patents by Inventor Katsuhito Oshima

Katsuhito Oshima 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).

  • Publication number: 20240280423
    Abstract: An optical fiber-embedded PC steel strand includes a PC steel strand in which a plurality of PC steel wires are twisted together, and an optical fiber. The optical fiber is fixed with a resin in a twist groove that is a groove between two PC steel wires of the PC steel wires, the two PC steel wires being disposed at an outer surface of the PC steel strand and being next to each other. A coefficient of variation in distance between a common tangent of the two PC steel wires that form the twist groove and are next to each other, and a center of the optical fiber is 0.5 or less, as measured in 10 cross sections of the PC steel strand that are perpendicular to a longitudinal direction of the PC steel strand.
    Type: Application
    Filed: May 11, 2022
    Publication date: August 22, 2024
    Inventors: Noboru UEDA, Youji NAKAI, Katsuhito OSHIMA, Yoshiyuki MATSUBARA, Motonobu NISHINO, Masashi OIKAWA, Shinji NAKAUE, Naoki SOGABE, Michio IMAI, Toru YAMAMOTO, Shinichi YAMANOBE, Kazumasa OKUBO
  • Publication number: 20220134715
    Abstract: Provided is a strand board with improved strength and water resistance. Reduction in productivity is prevented and characteristics of the strand board can be varied as desired while achieving certain strength and water resistance of the strand board. A strand board B is formed by stacking and laminating five strand layers 1 each formed by a large number of strands 5. The strand board B has substantially constant density distribution in the lamination direction of the strand layers 1. Three of the five strand layers 1 of the strand board B are high-density strand layers 1a having a higher density than the other strand layers 1, and the other strand layers 1 are low-density strand layers 1b.
    Type: Application
    Filed: January 21, 2022
    Publication date: May 5, 2022
    Inventors: Katsuhito OSHIMA, Kazuki SAKAMOTO, Kazuhiro HIRATA, Koji NAGAOKA, Yasushi SUGIO
  • Patent number: 11260630
    Abstract: Provided is a strand board with improved strength and water resistance. Reduction in productivity is prevented and characteristics of the strand board can be varied as desired while achieving certain strength and water resistance of the strand board. A strand board B is formed by stacking and laminating five strand layers 1 each formed by a large number of strands 5. The strand board B has substantially constant density distribution in the lamination direction of the strand layers 1. Three of the five strand layers 1 of the strand board B are high-density strand layers 1a having a higher density than the other strand layers 1, and the other strand layers 1 are low-density strand layers 1b.
    Type: Grant
    Filed: September 20, 2017
    Date of Patent: March 1, 2022
    Assignee: DAIKEN CORPORATION
    Inventors: Katsuhito Oshima, Kazuki Sakamoto, Kazuhiro Hirata, Koji Nagaoka, Yasushi Sugio
  • Patent number: 11001978
    Abstract: A concrete structure includes a first concrete member, a second concrete member, a sheath that is disposed in a through hole extending from the first concrete member to the second concrete member, a tension part that is inserted over the entire length of the sheath and that is subjected to a tensile force, a fixing tool that fixes the tension part to the first concrete member or the second concrete member, and an anticorrosion part that covers the fixing tool. The tension part includes a stranded wire part and a first cover that covers an outer periphery of the stranded wire part. A space between the sheath and the tension part is not filled with a grout material.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: May 11, 2021
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Motonobu Nishino, Masato Yamada, Yoshiyuki Matsubara, Katsuhito Oshima
  • Patent number: 10864652
    Abstract: This method for manufacturing a high-density strand board enables high-density strand boards to be formed by using about the same press pressure as press pressures required to form strand boards with common densities, so that the high-density strand boards can be produced without using special facilities and equipment. A pretreatment process P2 is performed on strands 5 before pressing. The pretreatment process P2 is comprised of a first treatment process P2a and a subsequent second treatment process P2b. At least one of beating, high-frequency treatment, high-temperature high-pressure treatment, high-water pressure treatment, repeated deaeration and dehydration treatment, and chemical treatment is performed in the first treatment process P2a, and roll pressing or flat press pressing is performed in the second treatment process P2b. A strand board B with a density of 750 to 950 kg/m3 is formed by using a press pressure of 4 N/mm2 or less.
    Type: Grant
    Filed: October 1, 2018
    Date of Patent: December 15, 2020
    Assignee: DAIKEN CORPORATION
    Inventors: Katsuhito Oshima, Yasushi Sugio, Koji Nagaoka, Kazuki Sakamoto
  • Patent number: 10808305
    Abstract: This invention provides a high-strength PC steel wire having a chemical composition containing, in mass %, C: 0.90 to 1.10%, Si: 0.80 to 1.50%, Mn: 0.30 to 0.70%, P: 0.030% or less, S: 0.030% or less, Al: 0.010 to 0.070%, N: 0.0010 to 0.010%, Cr: 0 to 0.50%, V: 0 to 0.10%, B: 0 to 0.005%, Ni: 0 to 1.0%, Cu: 0 to 0.50%, and the balance: Fe and impurities. A ratio between the Vickers hardness (HvS) at a location (surface layer) that is 0.1D [D: diameter of steel wire] from the surface of the steel wire and the Vickers hardness (HvI) of a region on the inner side relative to the surface layer satisfies the formula [1.10<HvS/HvI?1.15]. An average carbon concentration in a region from the surface to a depth of 10 ?m (outermost layer region) of the steel wire is 0.8 times or less a carbon concentration of the steel wire. The steel micro-structure in the region on the inner side relative to the outermost layer region contains, in area %, a pearlite structure: 95% or more.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: October 20, 2020
    Assignees: NIPPON STEEL CORPORATION, SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Makoto Okonogi, Daisuke Hirakami, Masato Yamada, Katsuhito Oshima, Shuichi Tanaka
  • Patent number: 10752974
    Abstract: This invention provides a high-strength PC steel wire having a chemical composition containing, in mass %, C: 0.90 to 1.10%, Si: 0.80 to 1.50%, Mn: 0.30 to 0.70%, P: 0.030% or less, S: 0.030% or less, Al: 0.010 to 0.070%, N: 0.0010 to 0.010%, Cr: 0 to 0.50%, V: 0 to 0.10%, B: 0 to 0.005%, Ni: 0 to 1.0%, Cu: 0 to 0.50%, and the balance: Fe and impurities. A ratio between the Vickers hardness (HvS) at a location (surface layer) that is 0.1D [D: diameter of steel wire] from the surface of the steel wire and the Vickers hardness (HvI) of a region on the inner side relative to the surface layer satisfies the formula [1.10<HvS/HvI?1.15]. The steel micro-structure in the region from the surface of the steel wire to 0.01D (outermost layer region) consists of, in area %, a pearlite structure: less than 80%, and the balance: a ferrite structure and/or a bainitic structure.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: August 25, 2020
    Assignees: NIPPON STEEL CORPORATION, SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Makoto Okonogi, Daisuke Hirakami, Masato Yamada, Katsuhito Oshima, Shuichi Tanaka
  • Publication number: 20200190735
    Abstract: A stranded wire having a plurality of steel wires twisted together includes, in its cross section perpendicular to its longitudinal direction, a central wire as the steel wire, a plurality of first circumferential wires as the steel wires arranged in contact with the central wire to surround an outer periphery side of the central wire, and a plurality of second circumferential wires as the steel wires arranged in contact with the first circumferential wires to surround an outer periphery side of a region where the first circumferential wires are arranged, the second circumferential wires being greater in yield stress than the central wire and the first circumferential wires. The central wire is in surface contact with the first circumferential wires. The first circumferential wires are in surface contact with the second circumferential wires.
    Type: Application
    Filed: June 30, 2017
    Publication date: June 18, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masashi OIKAWA, Toshiro KIDO, Katsuhito OSHIMA, Shuichi TANAKA, Yuka KISHIMOTO
  • Publication number: 20200123719
    Abstract: A concrete structure includes a first concrete member, a second concrete member, a sheath that is disposed in a through hole extending from the first concrete member to the second concrete member, a tension part that is inserted over the entire length of the sheath and that is subjected to a tensile force, a fixing tool that fixes the tension part to the first concrete member or the second concrete member, and an anticorrosion part that covers the fixing tool. The tension part includes a stranded wire part and a first cover that covers an outer periphery of the stranded wire part. A space between the sheath and the tension part is not filled with a grout material.
    Type: Application
    Filed: February 26, 2018
    Publication date: April 23, 2020
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Motonobu NISHINO, Masato YAMADA, Yoshiyuki MATSUBARA, Katsuhito OSHIMA
  • Publication number: 20190358849
    Abstract: This method for manufacturing a high-density strand board enables high-density strand boards to be formed by using about the same press pressure as press pressures required to form strand boards with common densities, so that the high-density strand boards can be produced without using special facilities and equipment. A pretreatment process P2 is performed on strands 5 before pressing. The pretreatment process P2 is comprised of a first treatment process P2a and a subsequent second treatment process P2b. At least one of beating, high-frequency treatment, high-temperature high-pressure treatment, high-water pressure treatment, repeated deaeration and dehydration treatment, and chemical treatment is performed in the first treatment process P2a, and roll pressing or flat press pressing is performed in the second treatment process P2b. A strand board B with a density of 750 to 950 kg/m3 is formed by using a press pressure of 4 N/mm2 or less.
    Type: Application
    Filed: October 1, 2018
    Publication date: November 28, 2019
    Inventors: Katsuhito OSHIMA, Yasushi SUGIO, Koji NAGAOKA, Kazuki SAKAMOTO
  • Patent number: 10323415
    Abstract: A pregrouted PC steel material (10) includes a 19-wire-twisted PC strand (1), a pregrouted layer (2) disposed on an outer periphery of the PC strand (1), and a sheath (3) configured to cover an outer periphery of the pregrouted layer (2). A filling resin (4) is filled between steel wires (side wires) (1b, 1c, 1d). Since the filling resin (4) does not exude to the pregrouted layer (2) before tensioning of the PC strand (10), an operation of tensioning the PC strand (1) is not hindered by curing of the pregrouted layer (2). In contrast, since the gap between the steel wires is reduced when the PC strand (1) is tensioned, the filling resin (4) flows out (exudes) from between the steel wires to the pregrouted layer (2) to cure the pregrouted layer (2) only after the reduction.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: June 18, 2019
    Assignee: Sumitomo (SEI) Steel Wire Corp.
    Inventors: Katsuhito Oshima, Masato Yamada, Yoshiyuki Matsubara, Kiminori Matsushita, Shuichi Tanaka, Jun Sugawara, Shingo Nakajima
  • Publication number: 20190099987
    Abstract: Provided is a strand board with improved strength and water resistance. Reduction in productivity is prevented and characteristics of the strand board can be varied as desired while achieving certain strength and water resistance of the strand board. A strand board B is formed by stacking and laminating five strand layers 1 each formed by a large number of strands 5. The strand board B has substantially constant density distribution in the lamination direction of the strand layers 1. Three of the five strand layers 1 of the strand board B are high-density strand layers 1a having a higher density than the other strand layers 1, and the other strand layers 1 are low-density strand layers 1b.
    Type: Application
    Filed: September 20, 2017
    Publication date: April 4, 2019
    Inventors: Katsuhito OSHIMA, Kazuki SAKAMOTO, Kazuhiro HIRATA, Koji NAGAOKA, Yasushi SUGIO
  • Patent number: 10081943
    Abstract: Provided is a pregrouted PC steel material comprising a PC steel stranded wire composed of a plurality of steel wires, a pregrout layer disposed on the outer periphery of the PC steel stranded wire so as to accommodate the PC steel stranded wire, a sheath covering the outer periphery of the pregrout layer, and a capsule including a pregrout-hardening agent and a film with which the agent is covered, the capsule being interposed among the steel wires constituting the PC steel stranded wire. The capsule has a strength such that the capsule is not broken before tensioning the PC steel stranded wire but is broken by a tensile force during the tensioning. Also provided is a method for hardening the pregrout layer.
    Type: Grant
    Filed: July 5, 2013
    Date of Patent: September 25, 2018
    Assignees: Sumitomo (SEI) Steel Wire Corp., Sumitomo Electric Industries, Ltd.
    Inventors: Takahide Saiki, Masato Yamada, Yoshihiko Touda, Takashi Ichiki, Kiminori Matsushita, Katsuhito Oshima, Jun Sugawara, Shingo Nakajima, Shuhei Maeda
  • Publication number: 20180216213
    Abstract: This invention provides a high-strength PC steel wire having a chemical composition containing, in mass %, C: 0.90 to 1.10%, Si: 0.80 to 1.50%, Mn: 0.30 to 0.70%, P: 0.030% or less, S: 0.030% or less, Al: 0.010 to 0.070%, N: 0.0010 to 0.010%, Cr: 0 to 0.50%, V: 0 to 0.10%, B: 0 to 0.005%, Ni: 0 to 1.0%, Cu: 0 to 0.50%, and the balance: Fe and impurities. A ratio between the Vickers hardness (HvS) at a location (surface layer) that is 0.1D [D: diameter of steel wire] from the surface of the steel wire and the Vickers hardness (HvI) of a region on the inner side relative to the surface layer satisfies the formula [1.10<HvS/HvI?1.15]. An average carbon concentration in a region from the surface to a depth of 10 ?m (outermost layer region) of the steel wire is 0.8 times or less a carbon concentration of the steel wire. The steel micro-structure in the region on the inner side relative to the outermost layer region contains, in area %, a pearlite structure: 95% or more.
    Type: Application
    Filed: July 20, 2016
    Publication date: August 2, 2018
    Inventors: Makoto OKONOGI, Daisuke HIRAKAMI, Masato YAMADA, Katsuhito OSHIMA, Shuichi TANAKA
  • Publication number: 20180216208
    Abstract: This invention provides a high-strength PC steel wire having a chemical composition containing, in mass %, C: 0.90 to 1.10%, Si: 0.80 to 1.50%, Mn: 0.30 to 0.70%, P: 0.030% or less, S: 0.030% or less, Al: 0.010 to 0.070%, N: 0.0010 to 0.010%, Cr: 0 to 0.50%, V: 0 to 0.10%, B: 0 to 0.005%, Ni: 0 to 1.0%, Cu: 0 to 0.50%, and the balance: Fe and impurities. A ratio between the Vickers hardness (HvS) at a location (surface layer) that is 0.1D [D: diameter of steel wire] from the surface of the steel wire and the Vickers hardness (HvI) of a region on the inner side relative to the surface layer satisfies the formula [1.10<HvS/HvI?1.15]. The steel micro-structure in the region from the surface of the steel wire to 0.01D (outermost layer region) consists of, in area %, a pearlite structure: less than 80%, and the balance: a ferrite structure and/or a bainitic structure.
    Type: Application
    Filed: July 20, 2016
    Publication date: August 2, 2018
    Inventors: Makoto OKONOGI, Daisuke HIRAKAMI, Masato YAMADA, Katsuhito OSHIMA, Shuichi TANAKA
  • Publication number: 20160076250
    Abstract: A pregrouted PC steel material (10) includes a 19-wire-twisted PC strand (1), a pregrouted layer (2) disposed on an outer periphery of the PC strand (1), and a sheath (3) configured to cover an outer periphery of the pregrouted layer (2). A filling resin (4) is filled between steel wires (side wires) (1b, 1c, 1d). Since the filling resin (4) does not exude to the pregrouted layer (2) before tensioning of the PC strand (10), an operation of tensioning the PC strand (1) is not hindered by curing of the pregrouted layer (2). In contrast, since the gap between the steel wires is reduced when the PC strand (1) is tensioned, the filling resin (4) flows out (exudes) from between the steel wires to the pregrouted layer (2) to cure the pregrouted layer (2) only after the reduction.
    Type: Application
    Filed: December 18, 2014
    Publication date: March 17, 2016
    Inventors: Katsuhito OSHIMA, Masato YAMADA, Yoshiyuki MATSUBARA, Kiminori MATSUSHITA, Shuichi TANAKA, Jun SUGAWARA, Shingo NAKAJIMA
  • Publication number: 20150159377
    Abstract: Provided is a pregrouted PC steel material comprising a PC steel stranded wire composed of a plurality of steel wires, a pregrout layer disposed on the outer periphery of the PC steel stranded wire so as to accommodate the PC steel stranded wire, a sheath covering the outer periphery of the pregrout layer, and a capsule including a pregrout-hardening agent and a film with which the agent is covered, the capsule being interposed among the steel wires constituting the PC steel stranded wire. The capsule has a strength such that the capsule is not broken before tensioning the PC steel stranded wire but is broken by a tensile force during the tensioning. Also provided is a method for hardening the pregrout layer.
    Type: Application
    Filed: July 5, 2013
    Publication date: June 11, 2015
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Takahide Saiki, Masato Yamada, Yoshihiko Touda, Takashi Ichiki, Kiminori Matsushita, Katsuhito Oshima, Jun Sugawara, Shingo Nakajima, Shuhei Maeda
  • Patent number: 7886490
    Abstract: There is provided a strand that can reduce the trouble in constructing an object to which compression force is applied by the strand and that can keep the construction cost down. A strand 1 is placed in a bore hole provided in a wall or roof surface, and is gripped by a wedge in a tensioned state so as to apply a tensile force to the wall or roof surface. The strand 1 of the present invention includes a pipe-shaped member (corrugated tube 11) made of metal, and a plurality of metal wires 12 arranged on the outer periphery of the corrugated tube 11. The metal wires 12 are arranged to surround the corrugated tube 11 on the cross section of the corrugated tube 11.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: February 15, 2011
    Assignee: Sumitomo (SEI) Steel Wire Corp.
    Inventors: Tomoya Maekawa, Toshihiko Niki, Yoshihiko Touda, Katsuhito Oshima
  • Publication number: 20100050546
    Abstract: There is provided a strand that can reduce the trouble in constructing an object to which compression force is applied by the strand and that can keep the construction cost down. A strand 1 is placed in a bore hole provided in a wall or roof surface, and is gripped by a wedge in a tensioned state so as to apply a tensile force to the wall or roof surface. The strand 1 of the present invention includes a pipe-shaped member (corrugated tube 11) made of metal, and a plurality of metal wires 12 arranged on the outer periphery of the corrugated tube 11. The metal wires 12 are arranged to surround the corrugated tube 11 on the cross section of the corrugated tube 11.
    Type: Application
    Filed: January 28, 2008
    Publication date: March 4, 2010
    Applicant: SUMITOMO (SEI) STEEL WIRE CORP.
    Inventors: Tomoya Maekawa, Toshihiko Niki, Yoshihiko Touda, Katsuhito Oshima