Patents by Inventor Kazuma Okura
Kazuma Okura 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: 11948755Abstract: An electrode body which achieves not only high initial capacitance of an electrolyte capacitor but also achieves stable capacitance even after being exposed to high temperature environment, and the electrolyte capacitor including the electrode body are provided. The electrode body is used for a negative electrode of the electrolyte capacitor, and the electrode body includes a negative electrode foil formed by a valve action metal, and a carbon layer formed on the negative electrode foil. The carbon layer includes a first spherical carbon and a second spherical carbon, and the first spherical carbon has a BET specific surface area larger than the second spherical carbon.Type: GrantFiled: June 12, 2020Date of Patent: April 2, 2024Assignee: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya Koseki, Kazuma Okura, Kazuhiro Nagahara
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Publication number: 20230360862Abstract: Provided is an electrode body that exhibits a good cathode side capacitance, and an electrolytic capacitor provided with this electrode body. The electrode body used for a cathode of the electrolytic capacitor has a cathode foil and a carbon layer. The cathode foil is made of a valve acting metal, and an enlarged surface layer is formed on the surface thereof. The carbon layer is formed on the enlarged surface layer. The interface between the enlarged surface layer and the carbon layer has an uneven shape.Type: ApplicationFiled: July 20, 2023Publication date: November 9, 2023Inventors: Kazuya Koseki, Kazuma Okura, Kazuhiro Nagahara, Kenji Machida
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Patent number: 11756740Abstract: Provided is an electrode body that exhibits a good cathode side capacitance, and an electrolytic capacitor provided with this electrode body. The electrode body used for a cathode of the electrolytic capacitor has a cathode foil and a carbon layer. The cathode foil is made of a valve acting metal, and an enlarged surface layer is formed on the surface thereof. The carbon layer is formed on the enlarged surface layer. The interface between the enlarged surface layer and the carbon layer has an uneven shape.Type: GrantFiled: June 7, 2019Date of Patent: September 12, 2023Inventors: Kazuya Koseki, Kazuma Okura, Kazuhiro Nagahara, Kenji Machida
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Publication number: 20230029692Abstract: Provided is a solid electrolytic capacitor having large capacitance, low ESR, and superior high-frequency characteristics and high-temperature endurance.Type: ApplicationFiled: December 15, 2020Publication date: February 2, 2023Applicant: NIPPON CHEMI-CON CORPORATIONInventors: Kazuya KOSEKI, Kazuhiro NAGAHARA, Kazuma OKURA
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Publication number: 20220262576Abstract: An electrode body which achieves not only high initial capacitance of an electrolyte capacitor but also achieves stable capacitance even after being exposed to high temperature environment, and the electrolyte capacitor including the electrode body are provided. The electrode body is used for a negative electrode of the electrolyte capacitor, and the electrode body includes a negative electrode foil formed by a valve action metal, and a carbon layer formed on the negative electrode foil. The carbon layer includes a first spherical carbon and a second spherical carbon, and the first spherical carbon has a BET specific surface area larger than the second spherical carbon.Type: ApplicationFiled: June 12, 2020Publication date: August 18, 2022Inventors: Kazuya KOSEKI, Kazuma OKURA, Kazuhiro NAGAHARA
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Patent number: 11152159Abstract: A hybrid capacitor with further increased energy density, and a manufacturing method thereof are provided. This hybrid capacitor is configured from a positive electrode which is a polarizable electrode that has double-layer capacitance, and a negative electrode which has a negative electrode active material which can occlude and release lithium ions and which is formed from metal compound particles having a three-dimensional network structure, wherein, as an electrolyte, the electrolytic solution contains lithium salts in a molar concentration greater than or equal to 1.6 M.Type: GrantFiled: June 16, 2017Date of Patent: October 19, 2021Assignee: NIPPON CHEMI-CON CORPORATIONInventors: Satoru Tsumeda, Kazuma Okura, Kenji Tamamitsu
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Publication number: 20210193395Abstract: Provided is an electrode body that exhibits a good cathode side capacitance, and an electrolytic capacitor provided with this electrode body. The electrode body used for a cathode of the electrolytic capacitor has a cathode foil and a carbon layer. The cathode foil is made of a valve acting metal, and an enlarged surface layer is formed on the surface thereof. The carbon layer is formed on the enlarged surface layer. The interface between the enlarged surface layer and the carbon layer has an uneven shape.Type: ApplicationFiled: June 7, 2019Publication date: June 24, 2021Inventors: Kazuya Koseki, Kazuma Okura, Kazuhiro Nagahara, Kenji Machida
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Publication number: 20190333708Abstract: A hybrid capacitor with further increased energy density, and a manufacturing method thereof are provided. This hybrid capacitor is configured from a positive electrode which is a polarizable electrode that has double-layer capacitance, and a negative electrode which has a negative electrode active material which can occlude and release lithium ions and which is formed from metal compound particles having a three-dimensional network structure, wherein, as an electrolyte, the electrolytic solution contains lithium salts in a molar concentration greater than or equal to 1.6M.Type: ApplicationFiled: June 16, 2017Publication date: October 31, 2019Inventors: Satoru TSUMEDA, Kazuma OKURA, Kenji TAMAMITSU
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Patent number: 9905372Abstract: Provided is an electrochemical capacitor which has low DC internal resistance, and which minimizes increase in the DC internal resistance due to a high temperature experience. The electrochemical capacitor is provided with a positive electrode having a positive electrode active material layer containing activated carbon, a negative electrode having a negative electrode active material layer containing a spinel-type lithium titanate, and a separator holding a non-aqueous electrolytic solution containing a lithium salt between the positive electrode active material layer and the negative electrode active material layer, a 100% discharge capacity of lithium titanate being set to within a range of 2.2 to 7.0 times a 100% discharge capacity of activated carbon. During charging and discharging of the electrochemical capacitor, only the area near the surfaces of lithium titanate particles are utilized, lowering the DCIR and improving the stability of the DCIR.Type: GrantFiled: August 11, 2014Date of Patent: February 27, 2018Assignee: NIPPON CHEMI-CON CORPORATIONInventors: Satoru Tsumeda, Kazuma Okura, Kazunori Takaki, Shuichi Ishimoto
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Publication number: 20160196930Abstract: Provided is an electrochemical capacitor which has low DC internal resistance, and which minimizes increase in the DC internal resistance due to a high temperature experience. The electrochemical capacitor is provided with a positive electrode having a positive electrode active material layer containing activated carbon, a negative electrode having a negative electrode active material layer containing a spinel-type lithium titanate, and a separator holding a non-aqueous electrolytic solution containing a lithium salt between the positive electrode active material layer and the negative electrode active material layer, a 100% discharge capacity of lithium titanate being set to within a range of 2.2 to 7.0 times a 100% discharge capacity of activated carbon. During charging and discharging of the electrochemical capacitor, only the area near the surfaces of lithium titanate particles are utilized, lowering the DCIR and improving the stability of the DCIR.Type: ApplicationFiled: August 11, 2014Publication date: July 7, 2016Applicant: NIPPON CHEMI-CON CORPORATIONInventors: Satoru TSUMEDA, Kazuma OKURA, Kazunori TAKAKI, Shuichi ISHIMOTO
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Patent number: 9090177Abstract: An uncertified battery replacement countermeasure apparatus for an electric vehicle including a power source that is driven by an electric power from a replaceable battery, in which it is judged whether or not a post-replacement battery is a battery certified to the electric vehicle, and when it is judged that the post-replacement battery is not the battery certified to the electric vehicle, a power output of the power source is restricted while permitting driving of the power source.Type: GrantFiled: August 9, 2011Date of Patent: July 28, 2015Assignee: NISSAN MOTOR CO., LTD.Inventor: Kazuma Okura
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Patent number: 8913369Abstract: Disclosed are an aluminum electrolytic capacitor having low impedance properties and a long service life, and an electrolytic solution which enables to give such capacitor. The electrolytic solution contains a solvent containing water, a phosphorus oxoacid ion-generating compound which can generate a phosphorus oxoacid ion in an aqueous solution, and a chelating agent which can coordinate with aluminum to form an aqueous aluminum chelate complex. The electrolytic solution further contains a compound selected from the group consisting of azelaic acid and an azelaic acid salt, and a compound selected from the group consisting of formic acid, a formic acid salt, adipic acid, an adipic acid salt, glutaric acid and a glutaric acid salt. The content of azelaic acid and/or the azelaic acid salt is at least 0.03 moles per kg of the solvent.Type: GrantFiled: January 28, 2014Date of Patent: December 16, 2014Assignee: Nippon Chemi-Con CorporationInventors: Masao Sakakura, Junichi Kawakami, Kazuma Okura, Shingo Takeuchi, Masashi Ozawa, Kenji Tamamitsu
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Publication number: 20140133066Abstract: Disclosed are an aluminum electrolytic capacitor having low impedance properties and a long service life, and an electrolytic solution which enables to give such capacitor. The electrolytic solution contains a solvent containing water, a phosphorus oxoacid ion-generating compound which can generate a phosphorus oxoacid ion in an aqueous solution, and a chelating agent which can coordinate with aluminum to form an aqueous aluminum chelate complex. The electrolytic solution further contains a compound selected from the group consisting of azelaic acid and an azelaic acid salt, and a compound selected from the group consisting of formic acid, a formic acid salt, adipic acid, an adipic acid salt, glutaric acid and a glutaric acid salt. The content of azelaic acid and/or the azelaic acid salt is at least 0.03 moles per kg of the solvent.Type: ApplicationFiled: January 28, 2014Publication date: May 15, 2014Applicant: NIPPON CHEMI-CON CORPORATIONInventors: Masao SAKAKURA, Junichi KAWAKAMI, Kazuma OKURA, Shingo TAKEUCHI, Masashi OZAWA, Kenji TAMAMITSU
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Patent number: 8675347Abstract: Disclosed are an aluminum electrolytic capacitor having low impedance properties and a long service life, and an electrolytic solution which enables to give such capacitor. The electrolytic solution contains a solvent containing water, a phosphorus oxoacid ion-generating compound which can generate a phosphorus oxoacid ion in an aqueous solution, and a chelating agent which can coordinate with aluminum to form an aqueous aluminum chelate complex. The electrolytic solution further contains a compound selected from the group consisting of azelaic acid and an azelaic acid salt, and a compound selected from the group consisting of formic acid, a formic acid salt, adipic acid, an adipic acid salt, glutaric acid and a glutaric acid salt. The content of azelaic acid and/or the azelaic acid salt is at least 0.03 moles per kg of the solvent.Type: GrantFiled: July 11, 2009Date of Patent: March 18, 2014Assignee: Nippon Chemi-Con CorporationInventors: Masao Sakakura, Junichi Kawakami, Kazuma Okura, Shingo Takeuchi, Masashi Ozawa, Kenji Tamamitsu
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Publication number: 20130197734Abstract: An uncertified battery replacement countermeasure apparatus for an electric vehicle including a power source that is driven by an electric power from a replaceable battery, in which it is judged whether or not a post-replacement battery is a battery certified to the electric vehicle, and when it is judged that the post-replacement battery is not the battery certified to the electric vehicle, a power output of the power source is restricted while permitting driving of the power source.Type: ApplicationFiled: August 9, 2011Publication date: August 1, 2013Inventor: Kazuma Okura
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Publication number: 20120026645Abstract: Disclosed are an aluminum electrolytic capacitor having low impedance properties and a long service life, and an electrolytic solution which enables to give such capacitor. The electrolytic solution contains a solvent containing water, a phosphorus oxoacid ion-generating compound which can generate a phosphorus oxoacid ion in an aqueous solution, and a chelating agent which can coordinate with aluminum to form an aqueous aluminum chelate complex. The electrolytic solution further contains a compound selected from the group consisting of azelaic acid and an azelaic acid salt, and a compound selected from the group consisting of formic acid, a formic acid salt, adipic acid, an adipic acid salt, glutaric acid and a glutaric acid salt. The content of azelaic acid and/or the azelaic acid salt is at least 0.03 moles per kg of the solvent.Type: ApplicationFiled: July 11, 2009Publication date: February 2, 2012Inventors: Masao Sakakura, Junichi Kawakami, Kazuma Okura, Shingo Takeuchi, Masashi Ozama, Kenji Tamamitsu
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Patent number: 7291412Abstract: A control apparatus and a control method are used in a fuel cell system, in which fuel gas and oxidant gas are supplied to a fuel cell stack 1 to generate electric power, a load unit 9 is driven by supplying the generated power thereto, and the generated power is stored in a power storage unit. A control unit 10 sets in advance a margin load power to be supplied from a power storage unit 8 to the fuel cell stack 1 when the load of the load unit 9 changes at a predetermined rate, and computes outputable power of the power storage unit 8. Then, the control unit 10 compares the margin load power and the outputable power to generate an amount judgment result. When the outputable power is larger than the margin load power, the control unit 10 controls the power generation amount of the fuel cell stack 1 such that charged power becomes equal to an electric power difference between the margin load power and the outputable power.Type: GrantFiled: November 9, 2001Date of Patent: November 6, 2007Assignee: Nissan Motor Co., Ltd.Inventors: Isamu Kazama, Kazuma Okura
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Publication number: 20030003335Abstract: A control apparatus and a control method are used in a fuel cell system, in which fuel gas and oxidant gas are supplied to a fuel cell stack 1 to generate electric power, a load unit 9 is driven by supplying the generated power thereto, and the generated power is stored in a power storage unit. A control unit 10 sets in advance a margin load power to be supplied from a power storage unit 8 to the fuel cell stack 1 when the load of the load unit 9 changes at a predetermined rate, and computes outputable power of the power storage unit 8. Then, the control unit 10 compares the margin load power and the outputable power to generate an amount judgment result. When the outputable power is larger than the margin load power, the control unit 10 controls the power generation amount of the fuel cell stack 1 such that charged power becomes equal to an electric power difference between the margin load power and the outputable power.Type: ApplicationFiled: July 19, 2002Publication date: January 2, 2003Inventors: Isamu Kazama, Kazuma Okura
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Patent number: 6190282Abstract: The present invention is proposed to avoid the generation of shocks when the output of an engine is switched with that of an electric motor connected by a clutch. The invention comprises a first electric motor connected mechanically to an engine and a second electrical motor connected mechanically through a clutch to an engine. The drive force is transmitted to the drive wheel through a transmission from the second electric motor. It is decided whether or not to connect the clutch on the basis of driving conditions. When it is decided to connect the clutch, the engine is controlled so that the output of the engine meets the required force. The first electric motor functions as an electric generator so that the rotation speed of the engine reaches a target rotation speed. When the engine is rotating at a target rotation speed, the clutch is connected. In this way, shocks are avoided when the clutch is connected and improved driving performance is realized.Type: GrantFiled: December 4, 1998Date of Patent: February 20, 2001Assignee: Nissan Motor Co., Ltd.Inventors: Yoshitaka Deguchi, Kazuma Okura, Yasuhiko Kitajima, Susumu Komiyama
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Patent number: 5993351Abstract: A shock when switching between the motive force of a motor and an engine is avoided. A first electrical motor mechanically connected to an engine and a second electrical motor connected mechanically to an engine through a clutch is provided. In a hybrid vehicle in which motive force is transmitted to the drive wheels through a transmission from a second electric motor, it is decided whether or not to release the clutch based on the vehicle speed detected value and the required motive force detected value. The engine output at that time is estimated. Thus if it is decided to release the clutch, the output of the second electrical motor is controlled so that the generated torque corresponds to said estimated output. The output of the first electrical motor is controlled so that the torque generated by the second electrical motor is absorbed. Hence the sum of both outputs is approximately 0.Type: GrantFiled: December 4, 1998Date of Patent: November 30, 1999Assignee: Nissan Motor Co., Ltd.Inventors: Yoshitaka Deguchi, Kazuma Okura, Yasuhiko Kitajima, Susumu Komiyama