Patents by Inventor Eiji Tsuru
Eiji Tsuru 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: 10449636Abstract: A pipeline is a pipeline having plural weld zones in which ends of plural steel pipes are joined by welding, the plural steel pipes are produced from plural charges of molten steel having one or more steel compositions; yield point elongation is not present on a stress-strain curve obtained when stress is applied in a longitudinal direction of each of the steel pipes; a thickness of each of the steel pipes t (mm) and an average pipe outside-diameter D (mm) satisfy t/D×100?6; and in the plurality of the weld zones, ?YS which is a yield strength difference between one steel pipe and the other steel pipe that are welded to each other (MPa), and YR representing a yield ratio that is a ratio of the yield strength to tensile strength of a pipe having a low yield strength out of the one steel pipe and the other steel pipe, satisfy ?YS??1.75×YR+230.Type: GrantFiled: July 13, 2017Date of Patent: October 22, 2019Assignee: NIPPON STEEL CORPORATIONInventors: Yukinobu Nagata, Eiji Tsuru, Yasuhiro Shinohara
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Publication number: 20170304953Abstract: A pipeline is a pipeline having plural weld zones in which ends of plural steel pipes are joined by welding, the plural steel pipes are produced from plural charges of molten steel having one or more steel compositions; yield point elongation is not present on a stress-strain curve obtained when stress is applied in a longitudinal direction of each of the steel pipes; a thickness of each of the steel pipes t (mm) and an average pipe outside-diameter D (mm) satisfy t/D×100?6; and in the plurality of the weld zones, ?YS which is a yield strength difference between one steel pipe and the other steel pipe that are welded to each other (MPa), and YR representing a yield ratio that is a ratio of the yield strength to tensile strength of a pipe having a low yield strength out of the one steel pipe and the other steel pipe, satisfy ?YS??1.75×YR+230.Type: ApplicationFiled: July 13, 2017Publication date: October 26, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Yukinobu NAGATA, Eiji TSURU, Yasuhiro SHINOHARA
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Patent number: 9737962Abstract: A pipeline is a pipeline having plural weld zones in which ends of plural steel pipes are joined by welding, the plural steel pipes are produced from plural charges of molten steel having one or more steel compositions; yield point elongation is not present on a stress-strain curve obtained when stress is applied in a longitudinal direction of each of the steel pipes; a thickness of each of the steel pipes t (mm) and an average pipe outside-diameter D (mm) satisfy t/D×100?6; and in the plurality of the weld zones, ?YS which is a yield strength difference between one steel pipe and the other steel pipe that are welded to each other (MPa), and YR representing a yield ratio that is a ratio of the yield strength to tensile strength of a pipe having a low yield strength out of the one steel pipe and the other steel pipe, satisfy ?YS??1.75×YR+230.Type: GrantFiled: January 28, 2013Date of Patent: August 22, 2017Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Yukinobu Nagata, Eiji Tsuru, Yasuhiro Shinohara
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Patent number: 9188253Abstract: A steel pipe with dual phase structure includes, as chemical composition, by mass %, C: 0.07% to 0.15%, Si: 0.1% to 0.5%, Mn: 0.8% to 1.9%, Nb: 0.020% to 0.10%, P: limited to 0.05% or less, S: limited to 0.01% or less, Al: limited to 0.1% or less, and a balance consisting of iron and unavoidable impurities, wherein, when [X] is amount of element X in mass %, carbon equivalent Ceq defined by Equation of Ceq=[C]+[Mn]/6 is 0.25 to 0.40 and [Nb]×[C]?0.002 is satisfied, and includes, as metallographic structure, by area %, ferrite of 80% to 98% and martensite, residual austenite, or mixture thereof of 2% to 20% in total, wherein average grain size of ferrite is 1 ?m to less than 8 ?m and average grain size of martensite, residual austenite, or mixture thereof is 0.1 ?m to 2 ?m.Type: GrantFiled: July 13, 2011Date of Patent: November 17, 2015Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Mitsuru Sawamura, Hitoshi Asahi, Eiji Tsuru, Jun Agata
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Patent number: 8955887Abstract: A liquid phase diffusion bonded pipe joint comprised of metal pipes or a metal pipe and a joint pipe joined by liquid phase diffusion bonding, the liquid phase diffusion bonded pipe joint comprised of a metal joint provided with a tapered slanted part press-fit into an end of a metal pipe by a thrust in a pipe axial direction while expanding the metal pipe in inside diameter and tightly engaging with the end and a joining surface part continuing from the tapered slanted part and joined with an end face of the metal pipe by liquid phase diffusion bonding and a metal pipe tightly engaging with the tapered slanted part in the expanded state and with an end face joined with the joining surface part by liquid phase diffusion bonding.Type: GrantFiled: August 19, 2009Date of Patent: February 17, 2015Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Eiji Tsuru, Yasushi Hasegawa, Yasuhiro Shinohara, Yuichi Sato
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Publication number: 20150004426Abstract: A pipeline is a pipeline having plural weld zones in which ends of plural steel pipes are joined by welding, the plural steel pipes are produced from plural charges of molten steel having one or more steel compositions; yield point elongation is not present on a stress-strain curve obtained when stress is applied in a longitudinal direction of each of the steel pipes; a thickness of each of the steel pipes t (mm) and an average pipe outside-diameter D (mm) satisfy t/Dx100?6; and in the plurality of the weld zones, ?YS which is a yield strength difference between one steel pipe and the other steel pipe that are welded to each other (MPa), and YR representing a yield ratio that is a ratio of the yield strength to tensile strength of a pipe having a low yield strength out of the one steel pipe and the other steel pipe, satisfy ?YS??1.75×YR+230.Type: ApplicationFiled: January 28, 2013Publication date: January 1, 2015Inventors: Yukinobu Nagata, Eiji Tsuru, Yasuhiro Shinohara
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Patent number: 8815024Abstract: The present invention provides steel plate or steel pipe with small occurrence of the Bauschinger effect and methods of production of the same, particularly steel pipe used for steel pipe for oil wells or line pipe with a small drop in the compression strength in the circumferential direction due to the Bauschinger effect when expanded and methods of production of the same, that is steel plate or steel pipe with small occurrence of the Bauschinger effect characterized by having a dual-phase structure substantially comprising a ferrite structure and fine martensite which is dispersed in the ferrite structure. Further, this steel plate or steel pipe contains, by mass %, C: 0.03 to 0.30%, Si: 0.01 to 0.8%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Al: 0.001 to 0.01%, and N: 0.01% or less and a balance of iron and unavoidable impurities.Type: GrantFiled: February 15, 2005Date of Patent: August 26, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Hitoshi Asahi, Eiji Tsuru
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Patent number: 8653400Abstract: The present invention provides a high strength welded steel pipe superior in weld zone embrittlement crack characteristics and a method of production of the same, that is, a method of production of a welded steel pipe superior in hydrogen embrittlement cracking resistance of weld metal characterized by seam welding from the inner and outer surfaces by a tensile strength of 850 MPa or more, then expanding or reducing the size of the pipe for correction, which method of production of welded steel pipe characterized in that the hydrogen concentration of the preceding weld metal is 0.2 cc or less per 100 g at ordinary temperature.Type: GrantFiled: February 22, 2006Date of Patent: February 18, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Eiji Tsuru, Takuya Hara, Hitoshi Asahi, Hiroshi Morimoto, Yoshio Terada, Tatsuya Yoshida, Kouichi Shinada
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Publication number: 20130118632Abstract: A steel pipe with dual phase structure includes, as chemical composition, by mass %, C: 0.07% to 0.15%, Si: 0.1% to 0.5%, Mn: 0.8% to 1.9%, Nb: 0.020% to 0.10%, P: limited to 0.05% or less, S: limited to 0.01% or less, Al: limited to 0.1% or less, and a balance consisting of iron and unavoidable impurities, wherein, when [X] is amount of element X in mass %, carbon equivalent Ceq defined by Equation of Ceq=[C]+[Mn]/6 is 0.25 to 0.40 and [Nb]×[C]?0.002 is satisfied, and includes, as metallographic structure, by area %, ferrite of 80% to 98% and martensite, residual austenite, or mixture thereof of 2% to 20% in total, wherein average grain size of ferrite is 1 ?m to less than 8 ?m and average grain size of martensite, residual austenite, or mixture thereof is 0.1 ?m to 2 ?m.Type: ApplicationFiled: July 13, 2011Publication date: May 16, 2013Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Mitsuru Sawamura, Hitoshi Asahi, Eiji Tsuru, Jun Agata
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Patent number: 8399418Abstract: The present invention provides a novel form of 3-(3-{4-[3-(?-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide with improved storage stability. Since bis[3-(3-{4-[3-(?-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide]monosebacate has extremely excellent storage stability, it is useful as a drug substance. Furthermore, it shows an extremely good crystalline property and can be purified by a convenient method, and therefore is suitable for the industrial preparation.Type: GrantFiled: December 24, 2008Date of Patent: March 19, 2013Assignee: Kissei Pharmaceutical Co., Ltd.Inventors: Hideki Takeuchi, Eiji Tsuru
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Patent number: 8354382Abstract: The present invention provides a novel form of 3-(3-{4-[3-(?-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide with improved storage stability. Since 3-(3-{4-[3-(?-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}-propylamino)-2,2-dimethylpropionamide hemifumarate dihydrate has extremely excellent storage stability, it is useful as a drug substance. Furthermore, it shows an extremely good crystalline property and can be purified by a convenient method, and therefore is suitable for the industrial preparation.Type: GrantFiled: April 13, 2009Date of Patent: January 15, 2013Assignee: Kissei Pharmaceutical Co., Ltd.Inventors: Hideki Takeuchi, Eiji Tsuru
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Patent number: 7967926Abstract: The present invention relates to UOE steel pipe excellent in collapse characteristics formed by the UOE production method and a method for forming this UOE steel pipe, said UOE steel pipe characterized in that a ratio between compression and tension of yield strength in the circumferential direction is at least 1.05 near the inside surface and is at least 0.9 to not more to 1.0 from the center of plate thickness to the outside surface.Type: GrantFiled: July 30, 2009Date of Patent: June 28, 2011Assignee: Nippon Steel CorporationInventors: Eiji Tsuru, Hitoshi Asahi
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Patent number: 7892368Abstract: The present invention relates to UOE steel pipe excellent in collapse characteristics formed by the UOE production method and a method for forming this UOE steel pipe, said UOE steel pipe characterized in that a ratio between compression and tension of yield strength in the circumferential direction is at least 1.05 near the inside surface and is at least 0.9 to not more to 1.0 from the center of plate thickness to the outside surface.Type: GrantFiled: May 23, 2003Date of Patent: February 22, 2011Assignee: Nippon Steel CorporationInventors: Eiji Tsuru, Hitoshi Asahi
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Publication number: 20110034679Abstract: The present invention provides a novel form of 3-(3-{4-[3-(?-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide with improved storage stability. Since 3-(3-{4-[3-(?-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}-propylamino)-2,2-dimethylpropionamide hemifumarate dihydrate has extremely excellent storage stability, it is useful as a drug substance. Furthermore, it shows an extremely good crystalline property and can be purified by a convenient method, and therefore is suitable for the industrial preparation.Type: ApplicationFiled: April 13, 2009Publication date: February 10, 2011Applicant: KISSEI PHARMACEUTICAL CO., LTDInventors: Hideki Takeuchi, Eiji Tsuru
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Publication number: 20100279962Abstract: The present invention provides a novel form of 3-(3-{4-[3-(?-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide with improved storage stability. Since bis[3-(3-{4-[3-(?-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide] monosebacate has extremely excellent storage stability, it is useful as a drug substance. Furthermore, it shows an extremely good crystalline property and can be purified by a convenient method, and therefore is suitable for the industrial preparation.Type: ApplicationFiled: December 24, 2008Publication date: November 4, 2010Applicant: KISSEI PHARMACEUTICAL CO., LTD.Inventors: Hideki Takeuchi, Eiji Tsuru
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Publication number: 20090320965Abstract: The present invention relates to UOE steel pipe excellent in collapse characteristics formed by the UOE production method and a method for forming this UOE steel pipe, said UOE steel pipe characterized in that a ratio between compression and tension of yield strength in the circumferential direction is at least 1.05 near the inside surface and is at least 0.9 to not more to 1.0 from the center of plate thickness to the outside surface.Type: ApplicationFiled: July 30, 2009Publication date: December 31, 2009Applicant: Nippon Steel CorporationInventors: Eiji Tsuru, Hitoshi Asahi
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Patent number: 7524001Abstract: A rubber crawler has a structure in which connecting members are sequentially fitted onto wing portions adjacent to each other without using steel cords for resisting tensile force applied to the rubber crawler. Accordingly, the rubber crawler of the present invention has excellent characteristics in that breakage of steel cords due to the tensile force can be prevented, and torsion of the rubber crawler can be reduced.Type: GrantFiled: November 20, 2003Date of Patent: April 28, 2009Assignee: Bridgestone CorporationInventors: Eiji Tsuru, Shinji Uchida
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Publication number: 20090044882Abstract: The invention provides an oil well pipe for expandable tubular applications excellent in post-expansion toughness and a method of manufacturing the oil well pipe. The oil well pipe for expandable tubular applications comprises, in mass %, C: 0.03 to 0.14%, Si: 0.8% or less, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Ti: 0.005 to 0.03%, Al: 0.1% or less, N: 0.001 to 0.01%, B: 0.0005 to 0.003%, optionally comprises one or move of Nb, Ni, Mo, Cr, Cu and V, and further optionally comprises one or both of Ca and REM, satisfies the relationship A=2.7C+0.4Si+Mn+0.45Ni+0.45Cu+0.8Cr+2Mo?1.8, has a balance of iron and unavoidable impurities, and is formed of tempered martensite structure. The manufacturing method according to the invention is characterized in subjecting a steel stock pipe of the foregoing composition to hardening from a temperature range of Ac3 point+30° C. or greater and to tempering at a temperature of 350 to 720° C.Type: ApplicationFiled: June 9, 2006Publication date: February 19, 2009Inventors: Hitoshi Asahi, Taro Muraki, Hideyuki Nakamura, Eiji Tsuru
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Patent number: 7459033Abstract: The present invention provides a method of production of oil country tubular goods having a small drop in collapse pressure after expansion and having a collapse pressure recovering by low temperature ageing at about 100° C. and oil country tubular goods obtained by this method of production. This method of production comprises hot rolling a steel slab having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities and shaping the steel strip coiled at a temperature of not more than 300° C. as it is into a tube. Alternatively, it comprises heating steel pipe having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities to a temperature of the Ac3 [° C.] to 1150° C., then cooling it in a range of 400 to 800° C. at a rate of 5 to 50° C./second.Type: GrantFiled: June 12, 2003Date of Patent: December 2, 2008Assignee: Nippon Steel CorporationInventors: Hitoshi Asahi, Eiji Tsuru
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Publication number: 20080286504Abstract: The present invention provides steel plate or steel pipe with small occurrence of the Bauschinger effect and methods of production of the same, particularly steel pipe used for steel pipe for oil wells or line pipe with a small drop in the compression strength in the circumferential direction due to the Bauschinger effect when expanded and methods of production of the same, that is steel plate or steel pipe with small occurrence of the Bauschinger effect characterized by having a dual-phase structure substantially comprising a ferrite structure and fine martensite which is dispersed in the ferrite structure. Further, this steel plate or steel pipe contains, by mass %, C: 0.03 to 0.30%, Si: 0.01 to 0.8%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Al: 0.001 to 0.01%, and N: 0.01% or less and a balance of iron and unavoidable impurities.Type: ApplicationFiled: February 15, 2005Publication date: November 20, 2008Inventors: Hitoshi Asahi, Eiji Tsuru