Patents by Inventor Yoshihiro Miwa
Yoshihiro Miwa 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: 20250003684Abstract: Molten iron is obtained with a low electric power consumption rate by efficiently and reliably preheating a cold iron source by ascertaining the preheating state of the cold iron source. A method of producing molten iron in an electric furnace having a preheating chamber and a melting chamber includes: a cold iron source feeding step; a cold iron source preheating step having a preheating confirmation step; a supply step; and a melting step.Type: ApplicationFiled: October 26, 2022Publication date: January 2, 2025Applicant: JFE STEEL CORPORATIONInventors: Koichi TSUTSUMI, Yoshihiro MIWA, Yosuke TAKADA, Wataru TODO, Sumito OZAWA, Hideo KIJIMA
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Publication number: 20240417818Abstract: A method for predicting an impurity concentration of molten iron after refining of molten iron to be refined in an electric arc furnace facility includes inputting, into an impurity concentration prediction model, an amount of individual ferrous scrap material charged, the ferrous scrap material being classified by type, and at least one of the impurity concentration of molten iron in a preceding charge, an amount of residual molten iron in the preceding charge, and market transaction price information of an impurity; and outputting the impurity concentration of the molten iron in a subsequent charge.Type: ApplicationFiled: July 21, 2022Publication date: December 19, 2024Applicant: JFE STEEL CORPORATIONInventors: Yoshihiro MIWA, Wataru TODO, Nobuhiko ODA
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Publication number: 20240364231Abstract: A first MOSFET, a second MOSFET, a first control circuit, and a second control circuit are provided; the second MOSFET is in a non-rectification period when the first MOSFET is in a rectification period; the first MOSFET is in a non-rectification period when the second MOSFET is in a rectification period; the first control circuit outputs a voltage generated on the basis of a first input voltage as a first output voltage between the gate and the source of the first MOSFET in at least a portion of a period in which a voltage between the drain and the source of the second MOSFET is inputted as the first input voltage and a negative voltage is applied between the drain and the source of the first MOSFET; the second control circuit outputs a voltage generated on the basis of a second input voltage as a second output voltage between the gate and the source of the second MOSFET in at least a portion of a period in which a voltage between the drain and the source of the first MOSFET is inputted as the second input vType: ApplicationFiled: October 13, 2022Publication date: October 31, 2024Inventors: Yoshihiro MIWA, Hiroyuki SHOJI, Junichi SAKANO, Tomoyuki UTSUMI, Takahiro HIGUCHI
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Publication number: 20240364229Abstract: An effective technique is applied to a rectifier circuit that performs synchronous rectification using a switching element. The rectifier circuit performs the synchronous rectification using a MOSFET, for example, as the switching element. By using the rectifier circuit, a capacitance of a capacitor for supplying power to a drive circuit can be reduced. As a result, downsizing and cost reduction of the rectifier circuit and the power supply using the rectifier circuit can be achieved.Type: ApplicationFiled: May 10, 2022Publication date: October 31, 2024Inventors: Yoshihiro MIWA, Hiroyuki SHOJI, Junichi SAKANO, Tomoyuki UTSUMI, Takahiro HIGUCHI
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Publication number: 20240118032Abstract: To directly and clearly observe the state inside a melting chamber in an electric furnace, a video-device-equipped electric furnace comprises: a melting chamber; a preheating chamber; and a video device to observe an inside of the melting chamber. The video device includes: a relay lens; an inner tube containing the relay lens and having an outer diameter of 100 mm or less; an outer tube containing the inner tube; and an imaging device located at an axial end of the relay lens on a furnace outside. The video device is provided through a hole in a furnace wall or lid so that the relay lens is located 300 mm to 3500 mm away from a highest molten iron interface in a vertically upward direction and the imaging device is located 300 mm or more away from an inner wall of the furnace wall or lid in a furnace outward direction.Type: ApplicationFiled: January 27, 2022Publication date: April 11, 2024Applicant: JFE STEEL CORPORATIONInventors: Koichi TSUTSUMI, Yoshihiro MIWA, Goro OKUYAMA, Katsutoshi ENDO, Shunichi KAWANAMI
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Publication number: 20240102737Abstract: To clearly observe the inside of a furnace where an object is heated by a burner. The burner includes: a lens; an imaging device; and a multiple pipe structure including: an inner pipe that surrounds the lens; an outer pipe that surrounds the inner pipe, separated from the inner pipe by a lens coolant passage; a gaseous fuel pipe radially outward of the outer pipe and operable to inject gaseous fuel; a combustion-supporting gas pipe radially outward of the outer pipe and operable to inject combustion-supporting gas; and a cooling pipe outermost in the multiple pipe structure that surrounds the gaseous fuel pipe and the combustion-supporting gas pipe.Type: ApplicationFiled: January 27, 2022Publication date: March 28, 2024Applicant: JFE STEEL CORPORATIONInventors: Yoshihiro MIWA, Koichi TSUTSUMI, Goro OKUYAMA
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Publication number: 20240093320Abstract: To reduce production costs by increasing molten iron heating efficiency, a production method using an electric furnace is provided with a preheating chamber, a melting chamber, a cold iron source supporter operable to partition the preheating chamber into a first and a second preheating chamber, an extruder, and a video device operable to observe the second preheating chamber is used, the method including a melting process, a heating process, a preheating process, and a tapping process are performed. In the heating process, heating of the molten iron is started after the cold iron source supporter is closed, and based on the visual information obtained via the video device of the second preheating chamber.Type: ApplicationFiled: January 27, 2022Publication date: March 21, 2024Applicant: JFE STEEL CORPORATIONInventors: Yoshihiro MIWA, Koichi TSUTSUMI, Goro OKUYAMA
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Publication number: 20240085110Abstract: To ensure stable supply of a cold iron source to a melting chamber, a method of producing molten iron uses an electric furnace that includes: a preheating chamber; a melting chamber; an extruder located in the preheating chamber; and a video device configured to observe an inside of the melting chamber, and comprises: an extrusion process of supplying a cold iron source preheated in the preheating chamber to the melting chamber by the extruder; and a melting process of melting the cold iron source supplied to the melting chamber by arc heat to obtain molten iron, wherein in the extrusion process, a moving amount of the extruder and/or a time interval for moving the extruder is controlled based on visual information obtained from the video device.Type: ApplicationFiled: January 27, 2022Publication date: March 14, 2024Applicant: JFE STEEL CORPORATIONInventors: Koichi TSUTSUMI, Yoshihiro MIWA, Shohei NAGASHIMA, Goro OKUYAMA, Katsutoshi ENDO, Shunichi KAWANAMI
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Publication number: 20240035102Abstract: An electric furnace with energy utilization efficiency at a low cost. In an electric furnace, a preheating chamber 2 with a melting chamber 1 is used to preheat iron scrap x, an exhaust gas generated in melting chamber 1 is passed through preheating chamber 2 filled with the iron scrap x to preheat the iron scrap x, the iron scrap x descends in the preheating chamber 2 to be supplied into melting chamber 1, and the iron scrap x is melted to obtain molten iron m. The iron scrap x is charged into preheating chamber 2 so that bulk density is not less than 0.50 t/m3 and less than 1.00 t/m3 and an iron scrap filling ratio HSC/HSF in the preheating chamber 2 is 0.5 to 0.8. A carbonaceous material is used for melting the iron scrap x, and oxygen and the carbonaceous material are blown into the melting chamber.Type: ApplicationFiled: June 22, 2020Publication date: February 1, 2024Applicant: JFE STEEL CORPORATIONInventors: Yoshihiro MIWA, Koichi TSUTSUMI, Ikuhiro SUMI
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Patent number: 11697679Abstract: In order to develop tools and methods useful in a variety of applications, including the research and development of medical treatments which involve the modification of collagen protein and use of the same, the present invention provides a modified collagen protein expressed in a transformed cell and capable of forming collagen fibers outside of the cell, wherein the transformation is performed by introducing, into the cell, polynucleotides coding the modified collagen protein.Type: GrantFiled: November 14, 2018Date of Patent: July 11, 2023Assignee: UNIVERSITY OF TSUKUBAInventors: Yoshihiro Miwa, Junko Kijima
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Publication number: 20220403478Abstract: A method for manufacturing molten iron by melting a cold iron source in an electric arc furnace having a carbonaceous material-injecting device. The method includes, in the carbonaceous material-injecting device, while a carbonaceous material is injected with a carrier gas through a central portion of the carbonaceous material-injecting device, injecting a fuel and a combustion-supporting gas through respective outer peripheral portions of the carbonaceous material-injecting device. The carbonaceous material injected through the central portion passes through a cylindrical combustion flame generated by a combustion reaction between the fuel and the combustion-supporting gas and is injected into molten slag and molten iron.Type: ApplicationFiled: October 14, 2020Publication date: December 22, 2022Applicant: JFE STEEL CORPORATIONInventors: Yoshihiro MIWA, Koichi TSUTSUMI, Ikuhiro SUMI
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Patent number: 11293694Abstract: Provided is an auxiliary burner for an electric furnace that has high iron scrap heating effect by appropriately and efficiently burning a solid fuel such as coal together with a gas fuel. An auxiliary burner for an electric furnace 100 has a structure in which a solid fuel injection tube 1, a gas fuel injection tube 2, and a combustion-supporting gas injection tube 3 are coaxially arranged in order from the center. The front end of the solid fuel injection tube 1 is located inside the gas fuel injection tube 2 to form, between the front end of the solid fuel injection tube 1 and the front end of the gas fuel injection tube 2, a first space 4 for solid fuel and gas fuel premixing surrounded by the front end portion of the gas fuel injection tube 2.Type: GrantFiled: September 27, 2017Date of Patent: April 5, 2022Assignee: JFE STEEL CORPORATIONInventors: Yoshihiro Miwa, Koichi Tsutsumi, Sumito Ozawa, Ikuhiro Sumi
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Patent number: 11041621Abstract: An auxiliary burner for an electric furnace capable of increasing and homogenizing the heating effect of iron scrap by suitably and efficiently burning solid fuel along with gas fuel. Auxiliary burner 100 for an electric furnace comprises a solid fuel injection tube 1, a gas fuel injection tube 2, and a combustion-supporting gas injection tube 3 in the stated order from the center side, all arranged coaxially, and is characterized in that: a combustion-supporting gas flow path 30 of the 10 combustion-supporting gas injection tube 3 is provided with a plurality of swirl vanes 4 for swirling the combustion-supporting gas, and the angle ? formed between the swirl vanes 4 and the burner axis is 5° or more and 45° or less.Type: GrantFiled: July 24, 2017Date of Patent: June 22, 2021Assignees: JFE STEEL CORPORATION, CHUGAIRO CO., LTD.Inventors: Sumito Ozawa, Koichi Tsutsumi, Yoshihiro Miwa, Ikuhiro Sumi, Kenichi Tomozawa, Takayuki Ito
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Patent number: 10935234Abstract: Provided is an auxiliary burner for an electric furnace capable of increasing and homogenizing the heating effect of iron scrap by suitably and efficiently burning solid fuel along with gas fuel. This auxiliary burner 100 for an electric furnace comprises a solid fuel injection tube 1, a gas fuel injection tube 2, and a combustion-supporting gas injection tube 3 in the stated order from the center side, all arranged coaxially, and is characterized in that: a flow path 30 of the combustion-supporting gas injection tube 3 is provided with a plurality of swirl vanes 4 for swirling the combustion-supporting gas, and a flow path 20 of the gas fuel injection tube 2 is provided with a plurality of swirl vanes 5 for swirling the gas fuel; and the angle ?1 of the swirl vanes 4 and the ?2 of the swirl vanes 5 satisfy the relationship ?1<?2.Type: GrantFiled: July 24, 2017Date of Patent: March 2, 2021Assignees: JFE STEEL CORPORATION, CHUGAI RO CO., LTD.Inventors: Koichi Tsutsumi, Yoshihiro Miwa, Sumito Ozawa, Ikuhiro Sumi, Kenichi Tomozawa, Takayuki Ito
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Publication number: 20210002349Abstract: In order to develop tools and methods useful in a variety of applications, including the research and development of medical treatments which involve the modification of collagen protein and use of the same, the present invention provides a modified collagen protein expressed in a transformed cell and capable of forming collagen fibers outside of said cell, wherein the transformation is performed by introducing, into the cell, into the cell, polynucleotides coding the modified collagen protein.Type: ApplicationFiled: November 14, 2018Publication date: January 7, 2021Inventors: Yoshihiro MIWA, Junko KIJIMA
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Publication number: 20190271465Abstract: Provided is an auxiliary burner for an electric furnace capable of increasing and homogenizing the heating effect of iron scrap by suitably and efficiently burning solid fuel along with gas fuel. This presently disclosed auxiliary burner 100 for an electric furnace comprises a solid fuel injection tube 1, a gas fuel injection tube 2, and a combustion-supporting gas injection tube 3 in the stated order from the center side, all arranged coaxially, and is characterized in that: a combustion-supporting gas flow path 30 of the combustion-supporting gas injection tube 3 is provided with a plurality of swirl vanes 4 for swirling the combustion-supporting gas, and the angle ? formed between the swirl vanes 4 and the burner axis is 5° or more and 45° or less.Type: ApplicationFiled: July 24, 2017Publication date: September 5, 2019Applicants: JFE STEEL CORPORATION, CHUGAI RO CO., LTD.Inventors: Sumito OZAWA, Koichi TSUTSUMI, Yoshihiro MIWA, Ikuhiro SUMI, Kenichi TOMOZAWA, Takayuki ITO
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Publication number: 20190264914Abstract: Provided is an auxiliary burner for an electric furnace capable of increasing and homogenizing the heating effect of iron scrap by suitably and efficiently burning solid fuel along with gas fuel. This auxiliary burner 100 for an electric furnace comprises a solid fuel injection tube 1, a gas fuel injection tube 2, and a combustion-supporting gas injection tube 3 in the stated order from the center side, all arranged coaxially, and is characterized in that: a flow path 30 of the combustion-supporting gas injection tube 3 is provided with a plurality of swirl vanes 4 for swirling the combustion-supporting gas, and a flow path 20 of the gas fuel injection tube 2 is provided with a plurality of swirl vanes 5 for swirling the gas fuel; and the angle ?1 of the swirl vanes 4 and the ?2 of the swirl vanes 5 satisfy the relationship ?1<?2.Type: ApplicationFiled: July 24, 2017Publication date: August 29, 2019Applicants: JFE STEEL CORPORATION, CHUGAI RO CO., LTD.Inventors: Koichi TSUTSUMI, Yoshihiro MIWA, Sumito OZAWA, Ikuhiro SUMI, Kenichi TOMOZAWA, Takayuki ITO
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Publication number: 20190249922Abstract: Provided is an auxiliary burner for an electric furnace that has high iron scrap heating effect by appropriately and efficiently burning a solid fuel such as coal together with a gas fuel. An auxiliary burner for an electric furnace 100 has a structure in which a solid fuel injection tube 1, a gas fuel injection tube 2, and a combustion-supporting gas injection tube 3 are coaxially arranged in order from the center. The front end of the solid fuel injection tube 1 is located inside the gas fuel injection tube 2 to form, between the front end of the solid fuel injection tube 1 and the front end of the gas fuel injection tube 2, a first space 4 for solid fuel and gas fuel premixing surrounded by the front end portion of the gas fuel injection tube 2.Type: ApplicationFiled: September 27, 2017Publication date: August 15, 2019Applicant: JFE STEEL CORPORATIONInventors: Yoshihiro MIWA, Koichi TSUTSUMI, Sumito OZAWA, Ikuhiro SUMI
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Patent number: 9039167Abstract: The present invention has a technical object to provide glasses which prevent invasion of pollen, can be continuously worn without any discomfort in wearing, and can effectively block ultraviolet ray. The present invention achieves the technical object by glasses including inwardly projecting visors in rims and end pieces of a frame, and glasses in which lenses, a frame, and inwardly projecting visors formed in the frame are formed of synthetic resin containing an ultraviolet absorbing agent or an ultraviolet scattering agent.Type: GrantFiled: November 22, 2010Date of Patent: May 26, 2015Assignee: KOWA CO., LTD.Inventors: Yoshihiro Miwa, Tadashi Kita
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Publication number: 20130145527Abstract: Protective glasses include a brace bar, arms attached to both ends of the brace bar, and a lens wherein a central upper part of the lens is fixedly attached to a center part of the brace bar. A canopy part having a shape corresponding to the face of a wearer protrudes from the peripheral edge of the lens. The lens is designed so as not to deform even if the wearer has a large head, and thus the gap between the canopy part and the face of the wearer does not increase. Therefore, the eyes of the wearer can be protected while ingress of matter such as pollen and dust is effectively prevented. In addition, since the angle of the optical axis does not change, images seen through the lens are not distorted.Type: ApplicationFiled: August 26, 2011Publication date: June 13, 2013Applicant: KOWA COMPANY, LTD.Inventors: Yoshihiro Miwa, Hirofumi Tominaga, Masataka Asada