Patents by Inventor Tetsuo Oosato
Tetsuo Oosato 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: 10032531Abstract: A chemical solution injection system 30 of an embodiment includes: a chemical solution reservoir 31 that stores a chemical solution containing a depositing substance to deposit to a member in contact with cooling water for absorbing heat in a plant; a pipe 32 through which the chemical solution passes; a first heat exchanger and a second heat exchanger that exchange heat between the cooling water and the chemical solution; a cooling water pipe 49 which connects the heat exchangers in series and in which the cooling water passes; and a pump 34 that conveys the chemical solution. The temperature of the chemical solution in the chemical solution reservoir 31 is lower than that of the cooling water. The pipe 32 sequentially connects the chemical solution reservoir 31, the first heat exchanger, the second heat exchanger and the plant. The cooling water guided from the inside of the plant passes through the second heat exchanger and subsequently passes through the first heat exchanger.Type: GrantFiled: December 31, 2014Date of Patent: July 24, 2018Assignee: KABUSHIKI KAISHA TOSHIBAInventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Hiroyuki Arai, Osamu Shibasaki, Koji Negishi, Hiromichi Koga
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Publication number: 20160372219Abstract: A chemical solution injection system 30 of an embodiment includes: a chemical solution reservoir 31 that stores a chemical solution containing a depositing substance to deposit to a member in contact with cooling water for absorbing heat in a plant; a pipe 32 through which the chemical solution passes; a first heat exchanger and a second heat exchanger that exchange heat between the cooling water and the chemical solution; a cooling water pipe 49 which connects the heat exchangers in series and in which the cooling water passes; and a pump 34 that conveys the chemical solution. The temperature of the chemical solution in the chemical solution reservoir 31 is lower than that of the cooling water. The pipe 32 sequentially connects the chemical solution reservoir 31, the first heat exchanger, the second heat exchanger and the plant. The cooling water guided from the inside of the plant passes through the second heat exchanger and subsequently passes through the first heat exchanger.Type: ApplicationFiled: December 31, 2014Publication date: December 22, 2016Applicant: Kabushiki Kaisha ToshibaInventors: Masato OKAMURA, Tetsuo Oosato, Seiji Yamamoto, Hiroyuki Arai, Osamu Shibasaki, Koji Negishi, Hiromichi Koga
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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: 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: 8731131Abstract: In a method of reducing corrosion of a material constituting a nuclear reactor structure, an electrochemical corrosion potential is controlled by injecting a solution or a suspension containing a substance generating an excitation current by an action of at least one of radiation, light, and heat existing in a nuclear reactor, or a metal or a metallic compound forming the substance generating the excitation current under the condition in the nuclear reactor to allow the substance generating the excitation current to adhere to the surface of the nuclear reactor structural material, and by injecting hydrogen in cooling water of the nuclear reactor while controlling the hydrogen concentration in a feed water.Type: GrantFiled: September 14, 2012Date of Patent: May 20, 2014Assignees: Kabushiki Kaisha Toshiba, Ishikawajima-Harima Heavy Industries Co., Ltd., The Tokyo Electric Power Company, IncorporatedInventors: Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Tetsuo Oosato, Masato Okamura, Junichi Takagi, Kenji Yamazaki, Shunichi Suzuki, Kenro Takamori, Mitsuru Sambongi, Takeshi Shibano, Takashi Hirano, Yuichi Fukaya
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Patent number: 8731132Abstract: In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.Type: GrantFiled: January 31, 2012Date of Patent: May 20, 2014Assignees: Kabushiki Kaisha Toshiba, The Tokyo Electric Power Company, IncorporatedInventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Kenji Yamazaki, Junichi Takagi, Hidehiro Urata, Shunichi Suzuki, Kenro Takamori, Junichi Suzuki
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Patent number: 8681925Abstract: In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.Type: GrantFiled: January 31, 2012Date of Patent: March 25, 2014Assignees: Kabushiki Kaisha Toshiba, The Tokyo Electric Power Company, IncorporatedInventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Kenji Yamazaki, Junichi Takagi, Hidehiro Urata, Shunichi Suzuki, Kenro Takamori, Junichi Suzuki
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Publication number: 20130070888Abstract: In a method of reducing corrosion of a material constituting a nuclear reactor structure, an electrochemical corrosion potential is controlled by injecting a solution or a suspension containing a substance generating an excitation current by an action of at least one of radiation, light, and heat existing in a nuclear reactor, or a metal or a metallic compound forming the substance generating the excitation current under the condition in the nuclear reactor to allow the substance generating the excitation current to adhere to the surface of the nuclear reactor structural material, and by injecting hydrogen in cooling water of the nuclear reactor while controlling the hydrogen concentration in a feed water.Type: ApplicationFiled: September 14, 2012Publication date: March 21, 2013Applicants: KABUSHIKI KAISHA TOSHIBA, THE TOKYO ELECTRIC POWER COMPANY, INCORPORATED, ISHIKAWAJIMA-HARIMA HEAVY INDUSTRIES CO., LTD.Inventors: Seiji YAMAMOTO, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Tetsuo Oosato, Masato Okamura, Junichi Takagi, Kenji Yamazaki, Shunichi Suzuki, Kenro Takamori, Mitsuru Sambongi, Takeshi Shibano, Takashi Hirano, Yuichi Fukaya
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Patent number: 8320514Abstract: In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.Type: GrantFiled: December 8, 2005Date of Patent: November 27, 2012Assignees: Kabushiki Kaisha Toshiba, The Tokyo Electric Power Company, IncorporatedInventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Kenji Yamazaki, Junichi Takagi, Hidehiro Urata, Shunichi Suzuki, Kenro Takamori, Junichi Suzuki
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Patent number: 8295426Abstract: In a method of reducing corrosion of a material constituting a nuclear reactor structure, an electrochemical corrosion potential is controlled by injecting a solution or a suspension containing a substance generating an excitation current by an action of at least one of radiation, light, and heat existing in a nuclear reactor, or a metal or a metallic compound forming the substance generating the excitation current under the condition in the nuclear reactor to allow the substance generating the excitation current to adhere to the surface of the nuclear reactor structural material, and by injecting hydrogen in cooling water of the nuclear reactor while controlling the hydrogen concentration in a feed water.Type: GrantFiled: December 10, 2004Date of Patent: October 23, 2012Assignees: Kabushiki Kaisha Toshiba, Ishikawajima-Harima Heavy Industries Co., Ltd., The Tokyo Electric Power Company, IncorporatedInventors: Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Tetsuo Oosato, Masato Okamura, Junichi Takagi, Kenji Yamazaki, Shunichi Suzuki, Kenro Takamori, Mitsuru Sambongi, Takeshi Shibano, Takashi Hirano, Yuichi Fukaya
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Publication number: 20120263269Abstract: In a method of reducing corrosion of a material constituting a nuclear reactor structure, an electrochemical corrosion potential is controlled by injecting a solution or a suspension containing a substance generating an excitation current by an action of at least one of radiation, light, and heat existing in a nuclear reactor, or a metal or a metallic compound forming the substance generating the excitation current under the condition in the nuclear reactor to allow the substance generating the excitation current to adhere to the surface of the nuclear reactor structural material, and by injecting hydrogen in cooling water of the nuclear reactor while controlling the hydrogen concentration in a feed water.Type: ApplicationFiled: December 10, 2004Publication date: October 18, 2012Applicants: Kabushiki Kaisha Toshiba, THE TOKYO ELECTRIC POWER COMPANY, INCORPORATED, Ishikawajima-Harima Heavy Industries Co., Ltd.Inventors: Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Tetsuo Oosato, Masato Okamura, Junichi Takagi, Kenji Yamazaki, Shunichi Suzuki, Kenro Takamori, Mitsuru Sambongi, Takeshi Shibano, Takashi Hirano, Yuichi Fukaya
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Publication number: 20120128886Abstract: In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.Type: ApplicationFiled: January 31, 2012Publication date: May 24, 2012Applicants: THE TOKYO ELECTRIC POWER COMPANY, INCORPORATED, Kabushiki Kaisha ToshibaInventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Kenji Yamazaki, Junichi Takagi, Hidehiro Urata, Shunichi Suzuki, Kenro Takamori, Junichi Suzuki
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Publication number: 20120128111Abstract: In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.Type: ApplicationFiled: January 31, 2012Publication date: May 24, 2012Applicants: THE TOKYO ELECTRIC POWER COMPANY, INCORPORATED, Kabushiki Kaisha ToshibaInventors: Masato OKAMURA, Tetsuo OOSATO, Seiji YAMAMOTO, Tadasu YOTSUYANAGI, Nagayoshi ICHIKAWA, Kenji YAMAZAKI, Junichi TAKAGI, Hidehiro URATA, Shunichi SUZUKI, Kenro TAKAMORI, Junichi SUZUKI
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Patent number: 7449101Abstract: In a method of reducing corrosion of a metal material, a substance such as semiconductor for generating an electric current by thermal excitation is coated or adhered on a metal material surface, to be exposed to a water having a high temperature of 150° C. or more, of a boiler and ducts or pipes, to which hot water heated by the boiler contacts, of a thermal electric power plant or a nuclear reactor structural material or ducts or pipes surrounding the reactor in a nuclear power plant.Type: GrantFiled: February 5, 2003Date of Patent: November 11, 2008Assignees: Kabushiki Kaisha Toshiba, The Tokyo Electric Power Company, Incorporated, Ishikawajima - Harima Heavy Industries Co., Ltd.Inventors: Masato Okamura, Yukio Henmi, Nagayoshi Ichikawa, Tetsuo Oosato, Seiji Yamamoto, Kazuo Murakami, Kenji Yamazaki, Junichi Takagi, Tadasu Yotsuyanagi, Shunichi Suzuki, Kenro Takamori, Mitsuru Sambongi, Yuichi Fukaya, Takasi Hirano
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Patent number: 7346140Abstract: A photocatalytic substance having the properties of an n-type semiconductor is deposited on a surface of a metal base made of a stainless steel or Inconel. When necessary, the hydrogen concentration of the reactor water is increased. A current produced by the photocatalytic substance when the same is irradiated with light or radioactive rays in a nuclear reactor flows through the metal base to reduce corrosion current. When necessary, the photocatalytic substance is provided on its surface with at least one of Pt, Rh, Ru and Pd.Type: GrantFiled: June 27, 2005Date of Patent: March 18, 2008Assignee: Kabushiki Kaisha ToshibaInventors: Nagayoshi Ichikawa, Yukio Hemmi, Tetsuo Oosato, Junichi Takagi, Kenji Yamazaki
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Publication number: 20060146975Abstract: In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.Type: ApplicationFiled: December 8, 2005Publication date: July 6, 2006Applicants: Kabushiki Kaisha Toshiba, THE TOKYO ELECTRIC POWER COMPANY, INCORPORATEDInventors: Masato Okamura, Tetsuo Oosato, Seiji Yamamoto, Tadasu Yotsuyanagi, Nagayoshi Ichikawa, Kenji Yamazaki, Junichi Takagi, Hidehiro Urata, Shunichi Suzuki, Kenro Takamori, Junichi Suzuki
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Publication number: 20060050833Abstract: A photocatalytic substance having the properties of an n-type semiconductor is deposited on a surface of a metal base made of a stainless steel or Inconel. When necessary, the hydrogen concentration of the reactor water is increased. A current produced by the photocatalytic substance when the same is irradiated with light or radioactive rays in a nuclear reactor flows through the metal base to reduce corrosion current. When necessary, the photocatalytic substance is provided on its surface with at least one of Pt, Rh, Ru and Pd.Type: ApplicationFiled: June 27, 2005Publication date: March 9, 2006Inventors: Nagayoshi Ichikawa, Yukio Hemmi, Tetsuo Oosato, Junichi Takagi, Kenji Yamazaki
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Patent number: 6940939Abstract: A photocatalytic substance having the properties of an n-type semiconductor is deposited on a surface of a metal base made of a stainless steel or Inconel. When necessary, the hydrogen concentration of the reactor water is increased. A current produced by the photocatalytic substance when the same is irradiated with light or radioactive rays in a nuclear reactor flows through the metal base to reduce corrosion current. When necessary, the photocatalytic substance is provided on its surface with at least one of Pt, Rh, Ru and Pd.Type: GrantFiled: June 22, 2000Date of Patent: September 6, 2005Assignee: Kabushiki Kaisha ToshibaInventors: Nagayoshi Ichikawa, Yukio Hemmi, Tetsuo Oosato, Junichi Takagi, Kenji Yamazaki
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Publication number: 20030180180Abstract: In a method of reducing corrosion of a metal material, a substance such as semiconductor for generating an electric current by thermal excitation is coated or adhered on a metal material surface, to be exposed to a water having a high temperature of 150° C. or more, of a boiler and ducts or pipes, to which hot water heated by the boiler contacts, of a thermal electric power plant or a nuclear reactor structural material or ducts or pipes surrounding the reactor in a nuclear power plant.Type: ApplicationFiled: February 5, 2003Publication date: September 25, 2003Applicants: Kabushiki Kaisha Toshiba, The Tokyo Electric Power Co. Inc., Ishikawajima-Harima Heavy Industries Co., Ltd.Inventors: Masato Okamura, Yukio Henmi, Nagayoshi Ichikawa, Tetsuo Oosato, Seiji Yamamoto, Kazuo Murakami, Kenji Yamazaki, Junichi Takagi, Tadasu Yotsuyanagi, Shunichi Suzuki, Kenro Takamori, Mitsuru Sambongi, Yuichi Fukaya, Takasi Hirano