Patents by Inventor Yuji Kaga
Yuji Kaga 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: 11946126Abstract: A welded structure including a base material made of duplex stainless steel and a welded portion formed by welding the base materials to each other, wherein the base material has a predetermined chemical composition, a volume fraction of a ferrite phase in a metallographic structure of a weld metal of the welded portion is 45 to 75%, a ratio of a hardness of the weld metal to a hardness of the base material is 0.80 to 1.20, and an amount of precipitates formed in the ferrite phase of the weld metal is less than 10% in area fraction.Type: GrantFiled: March 31, 2021Date of Patent: April 2, 2024Assignee: NIPPON STEEL STAINLESS STEEL CORPORATIONInventors: Eiichiro Ishimaru, Takuya Sakuraba, Yuji Kaga, Toyohiko Kakihara
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Publication number: 20220411909Abstract: A welded structure including a base material made of duplex stainless steel and a welded portion formed by welding the base materials to each other, wherein the base material has a predetermined chemical composition, a volume fraction of a ferrite phase in a metallographic structure of a weld metal of the welded portion is 45 to 75%, a ratio of a hardness of the weld metal to a hardness of the base material is 0.80 to 1.20, and an amount of precipitates formed in the ferrite phase of the weld metal is less than 10% in area fraction.Type: ApplicationFiled: March 31, 2021Publication date: December 29, 2022Applicant: NIPPON STEEL STAINLESS STEEL CORPORATIONInventors: Eiichiro ISHIMARU, Takuya SAKURABA, Yuji KAGA, Toyohiko KAKIHARA
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Patent number: 9693750Abstract: An evaluation aid is used as a phantom (imitation lesion) when a digital X-ray dynamic image thereof is taken and evaluated for image qualities for X-ray absorption parts having different X-ray absorption ratios. The evaluation aid contains a fixed plate (plate-like body) including a plurality of regions having different X-ray absorption ratios; a rotating disk (movable body) having a plurality of wires (wire rods), the rotating disk capable of rotating (moving) with respect to the fixed plate so that the plurality of wires traverse X-ray with which the fixed plate is irradiated; and a driving motor (driving portion) which rotates (moves) the rotating disk with respect to the fixed plate. It is preferred that thicknesses and/or constituent materials of the plurality of regions of the fixed plate are different from each other, so that these regions have the different X-ray absorption ratios.Type: GrantFiled: November 9, 2016Date of Patent: July 4, 2017Assignees: NATIONAL UNIVERSITY CORPORATION, TOHOKU UNIVERSITY, MITAYA MANFACTUING CO., LTD.Inventors: Koichi Chida, Yuji Kaga, Goro Yokouchi
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Patent number: 9662087Abstract: An evaluation aid serves as a phantom (imitation lesion) when a digital X-ray image is taken, and evaluation is then carried out through the digital X-ray image. The evaluation aid can simplify evaluating image qualities of a digital X-ray image for X-ray absorption parts having different X-ray absorption ratios all at once. The evaluation aid contains a substrate (plate-like body) including a plurality of regions having different X-ray absorption ratios for taking a digital X-ray image to carry out evaluation. Step members are provided on the plate-like body so as to correspond to the plurality of regions, respectively, where each step member includes a plurality of subregions having different X-ray absorption ratios. Preferably the thicknesses and/or constituent materials of the plurality of regions of the substrate are different from each other in order to have different X-ray absorption ratios in these regions.Type: GrantFiled: April 6, 2016Date of Patent: May 30, 2017Assignees: National University Corporation, Tohoku University, Mitaya Manufacturing Co., Ltd.Inventors: Koichi Chida, Yuji Kaga, Goro Yokouchi
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Publication number: 20170055937Abstract: An evaluation aid is used as a phantom (imitation lesion) when a digital X-ray dynamic image thereof is taken and evaluated for image qualities for X-ray absorption parts having different X-ray absorption ratios. The evaluation aid contains a fixed plate (plate-like body) including a plurality of regions having different X-ray absorption ratios; a rotating disk (movable body) having a plurality of wires (wire rods), the rotating disk capable of rotating (moving) with respect to the fixed plate so that the plurality of wires traverse X-ray with which the fixed plate is irradiated; and a driving motor (driving portion) which rotates (moves) the rotating disk with respect to the fixed plate. It is preferred that thicknesses and/or constituent materials of the plurality of regions of the fixed plate are different from each other, so that these regions have die different X-ray absorption ratios.Type: ApplicationFiled: November 9, 2016Publication date: March 2, 2017Inventors: Koichi CHIDA, Yuji KAGA, Goro YOKOUCHI
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Patent number: 9521989Abstract: An evaluation aid is used as a phantom (imitation lesion) when a digital X-ray dynamic image thereof is taken and evaluated for image qualities for X-ray absorption parts having different X-ray absorption ratios. The evaluation aid contains a fixed plate (plate-like body) including a plurality of regions having different X-ray absorption ratios; a rotating disk (movable body) having a plurality of wires (wire rods), the rotating disk capable of rotating (moving) with respect to the fixed plate so that the plurality of wires traverse X-ray with which the fixed plate is irradiated; and a driving motor (driving portion) which rotates (moves) the rotating disk with respect to the fixed plate. It is preferred that thicknesses and/or constituent materials of the plurality of regions of the fixed plate are different from each other, so that these regions have the different X-ray absorption ratios.Type: GrantFiled: June 13, 2016Date of Patent: December 20, 2016Assignees: National University Corporation, Tohoku University, Mitaya Manufacturing Co., Ltd.Inventors: Koichi Chida, Yuji Kaga, Goro Yokouchi
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Publication number: 20160296198Abstract: An evaluation aid is used as a phantom (imitation lesion) when a digital X-ray dynamic image thereof is taken and evaluated for image qualities for X-ray absorption parts having different X-ray absorption ratios. The evaluation aid contains a fixed plate (plate-like body) including a plurality of regions having different X-ray absorption ratios; a rotating disk (movable body) having a plurality of wires (wire rods), the rotating disk capable of rotating (moving) with respect to the fixed plate so that the plurality of wires traverse X-ray with which the fixed plate is irradiated; and a driving motor (driving portion) which rotates (moves) the rotating disk with respect to the fixed plate. It is preferred that thicknesses and/or constituent materials of the plurality of regions of the fixed plate are different from each other, so that these regions have the different X-ray absorption ratios.Type: ApplicationFiled: June 13, 2016Publication date: October 13, 2016Applicant: MITAYA MANUFACTURING CO., LTD.Inventors: Koichi CHIDA, Yuji KAGA, Goro YOKOUCHI
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Publication number: 20160242729Abstract: An evaluation aid serves as a phantom (imitation lesion) when a digital X-ray image is taken, and evaluation is then carried out through the digital X-ray image. The evaluation aid can simplify evaluating image qualities of a digital X-ray image for X-ray absorption parts having different X-ray absorption ratios all at once. The evaluation aid contains a substrate (plate-like body) including a plurality of regions having different X-ray absorption ratios for taking a digital X-ray image to carry out evaluation. Step members are provided on the plate-like body so as to correspond to the plurality of regions, respectively, where each step member includes a plurality of subregions having different X-ray absorption ratios. Preferably the thicknesses and/or constituent materials of the plurality of regions of the substrate are different from each other in order to have different X-ray absorption ratios in these regions.Type: ApplicationFiled: April 6, 2016Publication date: August 25, 2016Inventors: Koichi CHIDA, Yuji KAGA, Goro YOKOUCHI
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Patent number: 9392991Abstract: The present invention provides an evaluation aid which can be used as a phantom (imitation lesion) when a digital X-ray dynamic image thereof is taken and then evaluation is carried out through the digital X-ray dynamic image, and especially an evaluation aid which can be used for evaluating image qualities of a digital X-ray dynamic image for X-ray absorption parts having different X-ray absorption ratios, and an evaluation device provided with such an evaluation aid.Type: GrantFiled: July 2, 2012Date of Patent: July 19, 2016Assignees: NATIONAL UNIVERSITY CORPORATION, TOHOKU UNIVERSITY, MITAYA MANUFACTURING CO., LTD.Inventors: Koichi Chida, Yuji Kaga, Goro Yokouchi
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Patent number: 9332957Abstract: An evaluation aid which can be used as a phantom (imitation lesion) when a digital X-ray image is taken and then evaluation is carried out through the digital X-ray image. The evaluation aid can be used to easily evaluate image qualities of a digital X-ray image for object parts having different X-ray absorption ratios at once. The evaluation aid is adapted to be used for taking a digital X-ray image thereof through which evaluation is carried out, and contains a substrate (plate-like body) including a plurality of regions having different X-ray absorption ratios; and step members provided on the plate-like body so as to correspond to the plurality of regions, respectively. Each step member includes a plurality of subregions having different X-ray absorption ratios. Thicknesses and/or constituent materials of the plurality of regions of the substrate may be different from each other to establish regions having different X-ray absorption ratios.Type: GrantFiled: January 30, 2015Date of Patent: May 10, 2016Assignee: National University Corporation, Tohoku UniversityInventors: Koichi Chida, Yuji Kaga, Goro Yokouchi
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Publication number: 20150182186Abstract: The present invention provides an evaluation aid which can be used as a phantom (imitation lesion) when a digital X-ray image thereof is taken and then evaluation is carried out through the digital X-ray image, and especially an evaluation aid which can be used for easily evaluating image qualities of a digital X-ray image for X-ray absorption parts having different X-ray absorption ratios at once. The evaluation aid of the present invention is adapted to be used for taking a digital X-ray image thereof through which evaluation is carried out, and contains a substrate (plate-like body) including a plurality of regions having different X-ray absorption ratios; and step members provided on the plate-like body so as to correspond to the plurality of regions, respectively, each step member including a plurality of subregions having different X-ray absorption ratios.Type: ApplicationFiled: January 30, 2015Publication date: July 2, 2015Inventors: Koichi CHIDA, Yuji KAGA, Goro YOKOUCHI
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Patent number: 8981283Abstract: An evaluation aid which can be used as a phantom (imitation lesion) when a digital X-ray image thereof is taken and then evaluation is carried out through the digital X-ray image. The evaluation aid is adapted to be used for taking a digital X-ray image thereof through which evaluation is carried out, and contains a substrate (plate-like body) including a plurality of regions having different X-ray absorption ratios and step members provided on the plate-like body.Type: GrantFiled: July 26, 2011Date of Patent: March 17, 2015Assignees: National University Corporation, Tohoku University, Mitaya Manufacturing Co., Ltd.Inventors: Koichi Chida, Yuji Kaga, Goro Yokouchi
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Publication number: 20140146950Abstract: The present invention provides an evaluation aid which can be used as a phantom (imitation lesion) when a digital X-ray dynamic image thereof is taken and then evaluation is carried out through the digital X-ray dynamic image, and especially an evaluation aid which can be used for evaluating image qualities of a digital X-ray dynamic image for X-ray absorption parts having different X-ray absorption ratios, and an evaluation device provided with such an evaluation aid.Type: ApplicationFiled: July 2, 2012Publication date: May 29, 2014Applicants: MITAYA MANUFACTURING CO., LTD., NATIONAL UNIVERSITY CORPORATION, TOHOKU UNIVERSITYInventors: Koichi Chida, Yuji Kaga, Goro Yokouchi
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Publication number: 20130156164Abstract: The present invention provides an evaluation aid which can be used as a phantom (imitation lesion) when a digital X-ray image thereof is taken and then evaluation is carried out through the digital X-ray image, and especially an evaluation aid which can be used for easily evaluating image qualities of a digital X-ray image for X-ray absorption parts having different X-ray absorption ratios at once. The evaluation aid of the present invention is adapted to be used for taking a digital X-ray image thereof through which evaluation is carried out, and contains a substrate (plate-like body) including a plurality of regions having different X-ray absorption ratios; and step members provided on the plate-like body so as to correspond to the plurality of regions, respectively, each step member including a plurality of subregions having different X-ray absorption ratios.Type: ApplicationFiled: July 26, 2011Publication date: June 20, 2013Applicants: MITAYA MANUFACTURING CO., LTD., NATIONAL UNIVERSITY CORPORATION, TOHOKU UNIVERSITYInventors: Koichi Chida, Yuji Kaga, Goro Yokouchi