Patents by Inventor Hajime Hirasawa
Hajime Hirasawa 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: 10006127Abstract: In a plant including a system which is provided with a steam generator 2, a turbine 3, 5, a condenser 6 and a heater 7 and in which non-deaerated water circulates, and a pipe, the steam generator 2, the heater 7 and 8 of the system which comes into contact with the non-deaerated water is deposited with a protective substance.Type: GrantFiled: July 26, 2011Date of Patent: June 26, 2018Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Masato Okamura, Osamu Shibasaki, Seiji Yamamoto, Hajime Hirasawa
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Patent number: 9969889Abstract: The present invention provides a corrosion-resistant structure for a high-temperature water system comprising: a structural material 1; and a corrosion-resistant film 3 formed from a substance containing at least one of La and Y deposited on a surface in a side that comes in contact with a cooling water 4, of the structural material 1 which constitutes the high-temperature water system that passes a cooling water 4 of high temperature therein. Due to above construction, there can be provided the corrosion-resistant structure and a corrosion-preventing method capable of operating a plant without conducting a water chemistry control of cooling water by injecting chemicals.Type: GrantFiled: April 21, 2015Date of Patent: May 15, 2018Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Masato Okamura, Osamu Shibasaki, Koji Negishi, Seiji Yamamoto, Hajime Hirasawa, Kenji Yamazaki, Tetsuji Kaneko
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Patent number: 9771482Abstract: The present invention provides a corrosion-resistant structure for a high-temperature water system comprising: a structural material 1; and a corrosion-resistant film 3 formed from a substance containing at least one of La and Y deposited on a surface in a side that comes in contact with a cooling water 4, of the structural material 1 which constitutes the high-temperature water system that passes a cooling water 4 of high temperature therein. Due to above construction, there can be provided the corrosion-resistant structure and a corrosion-preventing method capable of operating a plant without conducting a water chemistry control of cooling water by injecting chemicals.Type: GrantFiled: April 21, 2015Date of Patent: September 26, 2017Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Masato Okamura, Osamu Shibasaki, Koji Negishi, Seiji Yamamoto, Hajime Hirasawa, Kenji Yamazaki, Tetsuji Kaneko
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Patent number: 9758880Abstract: A method for controlling water chemistry in a power generation plant including a low-pressure feedwater heater (18), a deaerator (19), and a high-pressure feedwater heater (20) disposed sequentially along a feedwater pipe (16) from a condenser (15) to a steam generator or a boiler (11) to control the chemistry of feedwater guided to the steam generator or the boiler includes the steps of: injecting an oxidant through an oxidant injection line (31) into feedwater flowing through the feedwater pipe disposed downstream of the condenser in such a way that a dissolved oxygen concentration in the feedwater ranges from 3 to 100 ppb while the feedwater is maintained to be neutral to form an oxide film on surfaces of the feedwater pipe, the low-pressure feedwater heater, the deaerator, the high-pressure feedwater heater, and other structural members that come into contact with the feedwater; and injecting a deoxidant through a deoxidant injection line (35) into the feedwater flowing through the feedwater pipe disposedType: GrantFiled: March 9, 2010Date of Patent: September 12, 2017Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Toyoaki Miyazaki, Masato Okamura, Osamu Shibasaki, Hajime Hirasawa
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Patent number: 9498185Abstract: An ultrasound probe (3) of an ultrasound diagnostic apparatus (1) includes an acceleration sensor (5) provided for outputting acceleration information for use in obtaining an angle of the ultrasound probe at the time of diagnosing a subject. The acceleration information is converted into angle information of the ultrasound probe by an angle conversion section (11). The ultrasound diagnostic apparatus (1) includes a monitor (4) for displaying a diagnosing image of the subject obtained with the ultrasound probe (3), and a body mark (16) corresponding to the diagnostic mode selected at the time of diagnosing and a probe icon (15) placed at an angle corresponding to the angle information with respect to the body mark (16) are displayed on the monitor (4). This makes it possible to provide an ultrasound diagnostic apparatus which can display an angle of the ultrasound probe at the time of diagnosing the subject.Type: GrantFiled: October 27, 2011Date of Patent: November 22, 2016Assignee: KONICA MINOLTA, INC.Inventors: Takashi Kimoto, Katsumi Satake, Seiichi Fukai, Satoru Uchikawa, Hajime Hirasawa, Masao Kimura
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Patent number: 9410252Abstract: A method for injecting a corrosion inhibitor injecting an oxidant and an anticorrosive agent-pH adjusting agent complex including an anticorrosive agent and a pH adjusting agent adsorbed on a surface of the anticorrosive agent into high temperature water in contact with a surface of a metal structural material and irradiating the high temperature water with a radioactive ray or an ultraviolet ray, wherein the anticorrosive agent of the anticorrosive agent-pH adjusting agent complex has, on the surface of the anticorrosive agent, an active site where the pH adjusting agent reacts with the oxidant, and the pH adjusting agent present on the surface of the anticorrosive agent of the anticorrosive agent-pH adjusting agent complex and/or in the high temperature water is oxidized with the oxidant by the irradiation with the radioactive ray or the ultraviolet ray to change pH adjusting ability of the pH adjusting agent and shift a pH of the high temperature water to a neutral side, and thereby deposition of the anticType: GrantFiled: September 13, 2012Date of Patent: August 9, 2016Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Masato Okamura, Tetsuo Oosato, Kazuo Murakami, Seiji Yamamoto, Hiroyuki Arai, Hidehiro Urata, Hajime Hirasawa, Osamu Shibasaki, Koji Negishi
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Publication number: 20150299473Abstract: The present invention provides a corrosion-resistant structure for a high-temperature water system comprising: a structural material 1; and a corrosion-resistant film 3 formed from a substance containing at least one of La and Y deposited on a surface in a side that comes in contact with a cooling water 4, of the structural material 1 which constitutes the high-temperature water system that passes a cooling water 4 of high temperature therein. Due to above construction, there can be provided the corrosion-resistant structure and a corrosion-preventing method capable of operating a plant without conducting a water chemistry control of cooling water by injecting chemicals.Type: ApplicationFiled: April 21, 2015Publication date: October 22, 2015Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masato OKAMURA, Osamu SHIBASAKI, Koji NEGISHI, Seiji YAMAMOTO, Hajime HIRASAWA, Kenji YAMAZAKI, Tetsuji KANEKO
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Publication number: 20150299474Abstract: The present invention provides a corrosion-resistant structure for a high-temperature water system comprising: a structural material 1; and a corrosion-resistant film 3 formed from a substance containing at least one of La and Y deposited on a surface in a side that comes in contact with a cooling water 4, of the structural material 1 which constitutes the high-temperature water system that passes a cooling water 4 of high temperature therein. Due to above construction, there can be provided the corrosion-resistant structure and a corrosion-preventing method capable of operating a plant without conducting a water chemistry control of cooling water by injecting chemicals.Type: ApplicationFiled: April 21, 2015Publication date: October 22, 2015Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masato OKAMURA, Osamu SHIBASAKI, Koji NEGISHI, Seiji YAMAMOTO, Hajime HIRASAWA, Kenji YAMAZAKI, Tetsuji KANEKO
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Patent number: 9062878Abstract: The present invention provides a corrosion-resistant structure for a high-temperature water system comprising: a structural material 1; and a corrosion-resistant film 3 formed from a substance containing at least one of La and Y deposited on a surface in a side that comes in contact with a cooling water 4, of the structural material 1 which constitutes the high-temperature water system that passes a cooling water 4 of high temperature therein. Due to above construction, there can be provided the corrosion-resistant structure and a corrosion-preventing method capable of operating a plant without conducting a water chemistry control of cooling water by injecting chemicals.Type: GrantFiled: November 16, 2010Date of Patent: June 23, 2015Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Masato Okamura, Osamu Shibasaki, Koji Negishi, Seiji Yamamoto, Hajime Hirasawa, Kenji Yamazaki, Tetsuji Kaneko
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Publication number: 20140242299Abstract: A method for injecting a corrosion inhibitor injecting an oxidant and an anticorrosive agent-pH adjusting agent complex including an anticorrosive agent and a pH adjusting agent adsorbed on a surface of the anticorrosive agent into high temperature water in contact with a surface of a metal structural material and irradiating the high temperature water with a radioactive ray or an ultraviolet ray, wherein the anticorrosive agent of the anticorrosive agent-pH adjusting agent complex has, on the surface of the anticorrosive agent, an active site where the pH adjusting agent reacts with the oxidant, and the pH adjusting agent present on the surface of the anticorrosive agent of the anticorrosive agent-pH adjusting agent complex and/or in the high temperature water is oxidized with the oxidant by the irradiation with the radioactive ray or the ultraviolet ray to change pH adjusting ability of the pH adjusting agent and shift a pH of the high temperature water to a neutral side, and thereby deposition of the anticType: ApplicationFiled: September 13, 2012Publication date: August 28, 2014Applicant: Kabushiki Kaisha ToshibaInventors: Masato Okamura, Tetsuo Oosato, Kazuo Murakami, Seiji Yamamoto, Hiroyuki Arai, Hidehiro Urata, Hajime Hirasawa, Osamu Shibasaki, Koji Negishi
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Patent number: 8798225Abstract: A radiation exposure reduction method includes the steps of: injecting iron into a coolant which flows from the reactor cooling system to the reactor core in a nuclear power plant; and ferritizing and fixing radionuclides or parent nuclides thereof, which are contained in the coolant, on the surface of a reactor core structure, wherein an iron citrate which is soluble organic iron, or iron oxalate or iron fumarate which has a particle diameter of 3 ?m or less, is used as the iron to be injected into the coolant.Type: GrantFiled: November 4, 2009Date of Patent: August 5, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Yumi Yaita, Seiji Yamamoto, Hajime Hirasawa, Yutaka Uruma
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Publication number: 20130182814Abstract: In a plant including a system which is provided with a steam generator 2, a turbine 3, 5, a condenser 6 and a heater 7 and in which non-deaerated water circulates, and a pipe, the steam generator 2, the heater 7 and 8 of the system which comes into contact with the non-deaerated water is deposited with a protective substance.Type: ApplicationFiled: July 26, 2011Publication date: July 18, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masato Okamura, Osamu Shibasaki, Seiji Yamamoto, Hajime Hirasawa
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Publication number: 20130018263Abstract: An ultrasound probe (3) of an ultrasound diagnostic apparatus (1) includes an acceleration sensor (5) provided for outputting acceleration information for use in obtaining an angle of the ultrasound probe at the time of diagnosing a subject. The acceleration information is converted into angle information of the ultrasound probe by an angle conversion section (11). The ultrasound diagnostic apparatus (1) includes a monitor (4) for displaying a diagnosing image of the subject obtained with the ultrasound probe (3), and a body mark (16) corresponding to the diagnostic mode selected at the time of diagnosing and a probe icon (15) placed at an angle corresponding to the angle information with respect to the body mark (16) are displayed on the monitor (4). This makes it possible to provide an ultrasound diagnostic apparatus which can display an angle of the ultrasound probe at the time of diagnosing the subject.Type: ApplicationFiled: October 27, 2011Publication date: January 17, 2013Inventors: Takashi Kimoto, Katsumi Satake, Seiichi Fukai, Satoru Uchikawa, Hajime Hirasawa, Masao Kimura
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Publication number: 20120225289Abstract: The present invention provides a corrosion-resistant structure for a high-temperature water system comprising: a structural material 1; and a corrosion-resistant film 3 formed from a substance containing at least one of La and Y deposited on a surface in a side that comes in contact with a cooling water 4, of the structural material 1 which constitutes the high-temperature water system that passes a cooling water 4 of high temperature therein. Due to above construction, there can be provided the corrosion-resistant structure and a corrosion-preventing method capable of operating a plant without conducting a water chemistry control of cooling water by injecting chemicals.Type: ApplicationFiled: November 16, 2010Publication date: September 6, 2012Applicant: Kabushiki Kaisha ToshibaInventors: Masato Okamura, Osamu Shibasaki, Koji Negishi, Seiji Yamamoto, Hajime Hirasawa, Kenji Yamazaki, Tetsuji Kaneko
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Publication number: 20110318223Abstract: A method for controlling water chemistry in a power generation plant including a low-pressure feedwater heater (18), a deaerator (19), and a high-pressure feedwater heater (20) disposed sequentially along a feedwater pipe (16) from a condenser (15) to a steam generator or a boiler (11) to control the chemistry of feedwater guided to the steam generator or the boiler includes the steps of: injecting an oxidant through an oxidant injection line (31) into feedwater flowing through the feedwater pipe disposed downstream of the condenser in such a way that a dissolved oxygen concentration in the feedwater ranges from 3 to 100 ppb while the feedwater is maintained to be neutral to form an oxide film on surfaces of the feedwater pipe, the low-pressure feedwater heater, the deaerator, the high-pressure feedwater heater, and other structural members that come into contact with the feedwater; and injecting a deoxidant through a deoxidant injection line (35) into the feedwater flowing through the feedwater pipe disposedType: ApplicationFiled: March 9, 2010Publication date: December 29, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Toyoaki Miyazaki, Masato Okamura, Osamu Shibasaki, Hajime Hirasawa
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Publication number: 20110211663Abstract: A radiation exposure reduction method includes the steps of: injecting iron into a coolant which flows from the reactor cooling system to the reactor core in a nuclear power plant; and ferritizing and fixing radionuclides or parent nuclides thereof, which are contained in the coolant, on the surface of a reactor core structure, wherein an iron citrate which is soluble organic iron, or iron oxalate or iron fumarate which has a particle diameter of 3 ?m or less, is used as the iron to be injected into the coolant.Type: ApplicationFiled: November 4, 2009Publication date: September 1, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yumi Yaita, Seiji Yamamoto, Hajime Hirasawa, Yutaka Uruma
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Publication number: 20050117690Abstract: A method for controlling water quality in a nuclear reactor comprises a first and second steps. The first step is to make an amount of iron, which is carried into the nuclear reactor and corrosively eluted from structural material within the nuclear reactor into reactor water, at least twice as much as any one of an amount of nickel, which is carried into the nuclear reactor, and an amount of nickel, which is generated in the nuclear reactor. The second step is to limit an upper limit of concentration value of iron in system water supplied into the nuclear reactor to up to 0.10 ppb.Type: ApplicationFiled: November 18, 2004Publication date: June 2, 2005Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yukio Hemmi, Kenji Yamazaki, Hajime Hirasawa
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Patent number: 6856665Abstract: A method for controlling water quality in a nuclear reactor comprises a first and second steps. The first step is to make an amount of iron, which is carried into the nuclear reactor and corrosively eluted from structural material within the nuclear reactor into reactor water, at least twice as much as any one of an amount of nickel, which is carried into the nuclear reactor, and an amount of nickel, which is generated in the nuclear reactor. The second step is to limit an upper limit of concentration value of iron in system water supplied into the nuclear reactor to up to 0.10 ppb.Type: GrantFiled: September 28, 2001Date of Patent: February 15, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Yukio Hemmi, Kenji Yamazaki, Hajime Hirasawa
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Patent number: 6587872Abstract: This invention aims at providing a network system having high flexibility and easy changeability. When software programs &agr;, &bgr;, and &ggr; are run in terminal computers 141 to 146, a host computer (10) builds software networks &agr;, &bgr;, &ggr; (FIG. A). When the software is changed from the program &agr; to &bgr; at the terminal computer 143, the terminal, computer 143 is switched and connected to the network &bgr;. Similarly, the terminal computer 144, is switched and connected to the network &bgr;. In other words, a flexible network can be formed in accordance with the software used by the terminal computer. Further, management of an accessing party becomes easier by using a personal ID.Type: GrantFiled: April 12, 2001Date of Patent: July 1, 2003Assignee: Faith Inc.Inventor: Hajime Hirasawa
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Publication number: 20020039399Abstract: A method for controlling water quality in a nuclear reactor comprises a first and second steps. The first step is to make an amount of iron, which is carried into the nuclear reactor and corrosively eluted from structural material within the nuclear reactor into reactor water, at least twice as much as any one of an amount of nickel, which is carried into the nuclear reactor, and an amount of nickel, which is generated in the nuclear reactor. The second step is to limit an upper limit of concentration value of iron in system water supplied into the nuclear reactor to up to 0.10 ppb.Type: ApplicationFiled: September 28, 2001Publication date: April 4, 2002Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yukio Hemmi, Kenji Yamazaki, Hajime Hirasawa