Patents by Inventor Mitsuru Sawamura
Mitsuru Sawamura 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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Publication number: 20240117989Abstract: A shut-off valve control device for a refrigeration cycle includes: a leakage detection unit configured to detect leakage of a refrigerant in a refrigeration cycle including an indoor unit and an outdoor unit; a shut-off valve which is disposed in a pipe that connects the indoor unit with the outdoor unit and which can be opened and closed by supplying electric power; a power failure detection unit configured to detect a power failure; a backup power supply configured to be capable of alternatively supplying power; and a shut-off valve control circuit configured to control the shut-off valve to be closed when the leakage detection unit detects leakage of the refrigerant. The shut-off valve control circuit causes the backup power supply to be started when the power failure detection unit detects a power failure and closes the shut-off valve when the detected power failure exceeds a certain time period.Type: ApplicationFiled: June 17, 2021Publication date: April 11, 2024Inventor: Mitsuru SAWAMURA
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Publication number: 20190226066Abstract: A steel plate according to an aspect of the present invention has a predetermined chemical composition, an index Q obtained by Equation (1) is 0.00 or more, a carbon equivalent Ceq (%) obtained by Equation (2) is less than 0.800%, a ratio of a difference between a hardness at a surface layer portion and a hardness at a thickness center portion to the hardness at the surface layer portion at a room temperature is 15.0% or less, the hardness at the suffice layer portion at a room temperature is 400 or more in terms of Vickers hardness, and a steel thickness is 40 or more. Q=0.18?1.3(logT)+0.75(2.7×[C]+[Mn]+0.45×[Ni]+0.Type: ApplicationFiled: February 27, 2018Publication date: July 25, 2019Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Mitsuru SAWAMURA, Naoki SAITOH, Yasunori TAKAHASHI, Takumi MIYAKE, Norimasa KAWABATA, Takeshi TSUZUKI
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Patent number: 9499873Abstract: In a steel plate according to the present invention, a chemical composition is within a predetermined range, an ? value is 0.13 to 1.0 mass %, a ? value is 8.45 to 15.2, an yield strength is 670 to 870 N/mm2, a tensile strength is 780 to 940 N/mm2, an average grain size at ½t of the steel plate is 35 ?m or less, and a plate thickness is 25 to 200 mm. In the steel plate according to the present invention, in a case where SR is performed on the steel, a charpy absorbed energy at ?40° C. in an area in which SR is performed may be 100 J or more.Type: GrantFiled: December 3, 2013Date of Patent: November 22, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Naoki Saitoh, Mitsuru Sawamura, Katsumi Kurebayashi, Yasunori Takahashi, Takumi Miyake
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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: 9126283Abstract: [Summary] [Object] There are provided electric resistance welded oil country tubular goods having strength corresponding to API specification 5CT P110 without a heat treatment being performed on the whole steel pipe and further having excellent toughness, and a manufacturing method of an electric resistance welded oil country tubular goods. [Solution] Electric resistance welded oil country tubular goods according to the present invention have a chemical composition that contains, in mass %, C: 0.05 to 0.12%, Si: 0.03 to 0.5%, Mn: 0.80 to 2.2%, P: 0.03% or less, S: 0.003% or less, Al: 0.08% or less, Nb: 0.01% to 0.10%, Ti: 0.005 to 0.03%, B: 0.0005 to 0.0030%, and N: 0.008% or less, and in which Ti>3.4 N is satisfied, its balance is composed of Fe and inevitable impurities, and, VC90 is 15 to 40.Type: GrantFiled: February 3, 2012Date of Patent: September 8, 2015Assignee: NIPPON STEEL AND SUMITOMO METAL CORPORATIONInventors: Mitsuru Sawamura, Hitoshi Asahi
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Publication number: 20150247214Abstract: In a steel plate according to the present invention, a chemical composition is within a predetermined range, an ? value is 0.13 to 1.0 mass %, a ? value is 8.45 to 15.2, an yield strength is 670 to 870 N/mm2, a tensile strength is 780 to 940 N/mm2, an average grain size at ½t of the steel plate is 35 ?m or less, and a plate thickness is 25 to 200 mm. In the steel plate according to the present invention, in a case where SR is performed on the steel, a charpy absorbed energy at ?40° C. in an area in which SR is performed may be 100 J or more.Type: ApplicationFiled: December 3, 2013Publication date: September 3, 2015Inventors: Naoki Saitoh, Mitsuru Sawamura, Katsumi Kurebayashi, Yasunori Takahashi, Takumi Miyake
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Patent number: 8795624Abstract: Provided is a monocrystalline silicon carbide ingot containing a dopant element, wherein a maximum concentration of the dopant element is less than 5×1017 atoms/cm3 and the maximum concentration is 50 times or less than that of a minimum concentration of the dopant element. Also provided is a monocrystalline silicon carbide wafer made by cutting and polishing the monocrystalline silicon carbide ingot, wherein a electric resistivity at room temperature of the wafer is 5×103 ?cm or more. Further provided is a method for manufacturing the monocrystalline silicon carbide including growing the monocrystalline silicon carbide on a seed crystal from a sublimation material by a sublimation method. The sublimation material includes a solid material containing a dopant element, and the specific surface of the solid material containing the dopant element is 0.5 m2/g or less.Type: GrantFiled: October 5, 2005Date of Patent: August 5, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Masashi Nakabayashi, Tatsuo Fujimoto, Mitsuru Sawamura, Noboru Ohtani
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Patent number: 8673254Abstract: Provided is a monocrystalline silicon carbide ingot containing a dopant element, wherein a maximum concentration of the dopant element is less than 5×1017 atoms/cm3 and the maximum concentration is 50 times or less than that of a minimum concentration of the dopant element. Also provided is a monocrystalline silicon carbide wafer made by cutting and polishing the monocrystalline silicon carbide ingot, wherein a electric resistivity at room temperature of the wafer is 5×103 ?cm or more. Further provided is a method for manufacturing the monocrystalline silicon carbide including growing the monocrystalline silicon carbide on a seed crystal from a sublimation material by a sublimation method. The sublimation material includes a solid material containing a dopant element, and the specific surface of the solid material containing the dopant element is 0.5 m2/g or less.Type: GrantFiled: March 4, 2011Date of Patent: March 18, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Masashi Nakabayashi, Tatsuo Fujimoto, Mitsuru Sawamura, Noboru Ohtani
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Patent number: 8491719Abstract: The present invention provides a high resistivity, high quality, large size SiC single crystal, SiC single crystal wafer, and method of production of the same, that is, a silicon carbide single crystal containing uncompensated impurities in an atomic number density of 1×1015/cm3 or more and containing vanadium in an amount less than said uncompensated impurity concentration, silicon carbide single crystal wafer obtained by processing and polishing the silicon carbide single crystal and having an electrical resistivity at room temperature of 5×103 ?cm or more, and a method of production of a silicon carbide single crystal.Type: GrantFiled: May 29, 2009Date of Patent: July 23, 2013Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Masashi Nakabayashi, Tatsuo Fujimoto, Mitsuru Sawamura, Noboru Ohtani
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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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Publication number: 20130092280Abstract: [Summary] [Object] There are provided electric resistance welded oil country tubular goods having strength corresponding to API specification 5CT P110 without a heat treatment being performed on the whole steel pipe and further having excellent toughness, and a manufacturing method of an electric resistance welded oil country tubular goods. [Solution] Electric resistance welded oil country tubular goods according to the present invention have a chemical composition that contains, in mass %, C: 0.05 to 0.12%, Si: 0.03 to 0.5%, Mn: 0.80 to 2.2%, P: 0.03% or less, S: 0.003% or less, Al: 0.08% or less, Nb: 0.01% to 0.10%, Ti: 0.005 to 0.03%, B: 0.0005 to 0.0030%, and N: 0.008% or less, and in which Ti>3.4 N is satisfied, its balance is composed of Fe and inevitable impurities, and, VC90 is 15 to 40.Type: ApplicationFiled: February 3, 2012Publication date: April 18, 2013Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Mitsuru Sawamura, Hitoshi Asahi
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Patent number: 8178389Abstract: Provided is a monocrystalline silicon carbide ingot containing a dopant element, wherein a maximum concentration of the dopant element is less than 5×1017 atoms/cm3 and the maximum concentration is 50 times or less than that of a minimum concentration of the dopant element. Also provided is a monocrystalline silicon carbide wafer made by cutting and polishing the monocrystalline silicon carbide ingot, wherein a electric resistivity at room temperature of the wafer is 5×103 ?cm or more. Further provided is a method for manufacturing the monocrystalline silicon carbide including growing the monocrystalline silicon carbide on a seed crystal from a sublimation material by a sublimation method. The sublimation material includes a solid material containing a dopant element, and the specific surface of the solid material containing the dopant element is 0.5 m2/g or less.Type: GrantFiled: February 18, 2010Date of Patent: May 15, 2012Assignee: Nippon Steel CorporationInventors: Masashi Nakabayashi, Tatsuo Fujimoto, Mitsuru Sawamura, Noboru Ohtani
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Publication number: 20110180765Abstract: Provided is a monocrystalline silicon carbide ingot containing a dopant element, wherein a maximum concentration of the dopant element is less than 5×1017 atoms/cm3 and the maximum concentration is 50 times or less than that of a minimum concentration of the dopant element. Also provided is a monocrystalline silicon carbide wafer made by cutting and polishing the monocrystalline silicon carbide ingot, wherein a electric resistivity at room temperature of the wafer is 5×103 ?cm or more. Further provided is a method for manufacturing the monocrystalline silicon carbide including growing the monocrystalline silicon carbide on a seed crystal from a sublimation material by a sublimation method. The sublimation material includes a solid material containing a dopant element, and the specific surface of the solid material containing the dopant element is 0.5 m2/g or less.Type: ApplicationFiled: March 4, 2011Publication date: July 28, 2011Inventors: Masashi Nakabayashi, Tatsuo Fujimoto, Mitsuru Sawamura, Noboru Ohtani
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Patent number: 7799305Abstract: The present invention provides a semi-insulating silicon carbide single crystal characterized by having an electrical resistivity at room temperature of 1×105 ?cm or more, and a semi-insulating silicon carbide single crystal characterized by having an electrical resistivity at room temperature of 1×105 ?cm or more and vacancy pairs (bivacancies), and an semi-insulating silicon carbide single crystal characterized by having an electrical resistivity at room temperature of 1×105 ?cm or more and containing a crystal region where a position average lifetime becomes a lifetime longer than 155 ps in measurement of position lifetime at a liquid nitrogen boiling point temperature (77K) or less, and wafer obtained therefrom.Type: GrantFiled: June 15, 2005Date of Patent: September 21, 2010Assignee: Nippon Steel CorporationInventors: Mitsuru Sawamura, Tatsuo Fujimoto, Noboru Ohtani, Masashi Nakabayashi
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Patent number: 7794842Abstract: The present invention provides a high resistivity, high quality, large size SiC single crystal, SiC single crystal wafer, and method of production of the same, that is, a silicon carbide single crystal containing uncompensated impurities in an atomic number density of 1 ×1015/cm3 or more and containing vanadium in an amount less than said uncompensated impurity concentration, silicon carbide single crystal wafer obtained by processing and polishing the silicon carbide single crystal and having an electrical resistivity at room temperature of 5×103 ?cm or more, and a method of production of a silicon carbide single crystal.Type: GrantFiled: December 27, 2004Date of Patent: September 14, 2010Assignee: Nippon Steel CorporationInventors: Masashi Nakabayashi, Tatsuo Fujimoto, Mitsuru Sawamura, Noboru Ohtani
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Publication number: 20100147212Abstract: Provided is a monocrystalline silicon carbide ingot containing a dopant element, wherein a maximum concentration of the dopant element is less than 5×1017 atoms/cm3 and the maximum concentration is 50 times or less than that of a minimum concentration of the dopant element. Also provided is a monocrystalline silicon carbide wafer made by cutting and polishing the monocrystalline silicon carbide ingot, wherein a electric resistivity at room temperature of the wafer is 5×103 ?cm or more. Further provided is a method for manufacturing the monocrystalline silicon carbide including growing the monocrystalline silicon carbide on a seed crystal from a sublimation material by a sublimation method. The sublimation material includes a solid material containing a dopant element, and the specific surface of the solid material containing the dopant element is 0.5 m2/g or less.Type: ApplicationFiled: February 18, 2010Publication date: June 17, 2010Inventors: Masashi NAKABAYASHI, Tatsuo FUJIMOTO, Mitsuru SAWAMURA, Noboru OHTANI
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Publication number: 20090255458Abstract: The present invention provides a high resistivity, high quality, large size SiC single crystal, SiC single crystal wafer, and method of production of the same, that is, a silicon carbide single crystal containing uncompensated impurities in an atomic number density of 1×1015/cm3 or more and containing vanadium in an amount less than said uncompensated impurity concentration, silicon carbide single crystal wafer obtained by processing and polishing the silicon carbide single crystal and having an electrical resistivity at room temperature of 5×103 ?cm or more, and a method of production of a silicon carbide single crystal.Type: ApplicationFiled: May 29, 2009Publication date: October 15, 2009Applicant: Nippon Steel CorporationInventors: Masashi Nakabayashi, Tatsuo Fujimoto, Mitsuru Sawamura, Noboru Ohtani
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Publication number: 20080220232Abstract: The present invention provides a high resistivity, high quality, large size SiC single crystal, SiC single crystal wafer, and method of production of the same, that is, a silicon carbide single crystal containing uncompensated impurities in an atomic number density of 1×1015/cm3 or more and containing vanadium in an amount less than said uncompensated impurity concentration, silicon carbide single crystal wafer obtained by processing and polishing the silicon carbide single crystal and having an electrical resistivity at room temperature of 5×103 ?cm or more, and a method of production of a silicon carbide single crystal.Type: ApplicationFiled: December 27, 2004Publication date: September 11, 2008Inventors: Masashi Nakabayashi, Tatsuo Fujimoto, Mitsuru Sawamura, Noboru Ohtani
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Publication number: 20080038531Abstract: The present invention provides a semi-insulating silicon carbide single crystal characterized by having an electrical resistivity at room temperature of 1×105 ?cm or more, and a semi-insulating silicon carbide single crystal characterized by having an electrical resistivity at room temperature of 1×105 ?cm or more and vacancy pairs (bivacancies), and an semi-insulating silicon carbide single crystal characterized by having an electrical resistivity at room temperature of 1×105 ?cm or more and containing a crystal region where a position average lifetime becomes a lifetime longer than 155 ps in measurement of position lifetime at a liquid nitrogen boiling point temperature (77K) or less, and wafer obtained therefrom.Type: ApplicationFiled: June 15, 2005Publication date: February 14, 2008Inventors: Mitsuru Sawamura, Tatsuo Fujimoto, Noboru Ohtani, Masashi Nakabayashi
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Publication number: 20070262322Abstract: Provided is a monocrystalline silicon carbide ingot containing a dopant element, wherein a maximum concentration of the dopant element is less than 5×1017 atoms/cm3 and the maximum concentration is 50 times or less than that of a minimum concentration of the dopant element. Also provided is a monocrystalline silicon carbide wafer made by cutting and polishing the monocrystalline silicon carbide ingot, wherein a electric resistivity at room temperature of the wafer is 5×103 ?cm or more. Further provided is a method for manufacturing the monocrystalline silicon carbide including growing the monocrystalline silicon carbide on a seed crystal from a sublimation material by a sublimation method. The sublimation material includes a solid material containing a dopant element, and the specific surface of the solid material containing the dopant element is 0.5 m2/g or less.Type: ApplicationFiled: October 5, 2005Publication date: November 15, 2007Applicant: NIPPON STEEL CORPORATIONInventors: Masashi Nakabayashi, Tatsuo Fujimoto, Mitsuru Sawamura, Noboru Ohtani