Patents by Inventor Tatsuo Umeno
Tatsuo Umeno 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: 11814296Abstract: The present disclosure relates to novel particulate composite materials comprising a graphitic core particle associated with SiOx nanoparticles (0.2?X?1.8), and coated by a layer of non-graphitic carbon, e.g., pyrolytic carbon deposited by chemical vapor deposition (CVD). Also included are processes for making such particles as well as uses and downstream products for the novel composite material, in particular as an active material in negative electrodes in Li-ion batteries.Type: GrantFiled: July 20, 2018Date of Patent: November 14, 2023Assignee: Imerys Graphite & Carbon Switzerland Ltd.Inventors: Michael Spahr, Michal Gulas, Tatsuo Umeno, Hiroyuki Taki, Pascual Perez
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Publication number: 20200148545Abstract: The present disclosure relates to novel particulate composite materials comprising a graphitic core particle associated with SiOX nanoparticles (0.2?X?1.8), and coated by a layer of non-graphitic carbon, e.g., pyrolytic carbon deposited by chemical vapor deposition (CVD). Also included are processes for making such particles as well as uses and downstream products for the novel composite material, in particular as an active material in negative electrodes in Li-ion batteries.Type: ApplicationFiled: July 20, 2018Publication date: May 14, 2020Inventors: Michael SPAHR, Michal GULAS, Tatsuo UMENO, Hiroyuki TAKI, Pascual PEREZ
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Publication number: 20180315994Abstract: The present invention provides an apparatus for manufacturing a lithium-ion secondary cell negative-electrode carbon material by heat-treating carbon particles while causing the carbon particles to flow within a heat-treatment furnace, the apparatus for manufacturing a lithium-ion secondary battery negative-electrode carbon material having: a heat-treatment furnace provided with a carbon-particle supply opening for supplying the carbon particles into the interior, and a negative-electrode carbon material recovery opening for taking out the negative-electrode carbon material from the interior; and a cooling tank connected in an airtight manner to the negative-electrode carbon material recovery opening of the heat-treatment furnace, and provided with a cooling means. Also provided is a method for manufacturing a lithium-ion secondary battery negative-electrode carbon material by using the apparatus.Type: ApplicationFiled: July 10, 2018Publication date: November 1, 2018Applicant: NIPPON POWER GRAPHITE CO., LTD.Inventors: TATSUO UMENO, TADANORI TSUNAWAKI, SHINYA OKABE, SHIROU OIE, JYUGO SUMITOMO, SHIGEYOSI NAKANO
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Patent number: 10044024Abstract: An apparatus for manufacturing a lithium-ion secondary cell negative-electrode carbon material by heat-treating carbon particles while causing the carbon particles to flow within a heat-treatment furnace, the apparatus having a heat-treatment furnace provided with a carbon-particle supply opening for supplying the carbon particles into the interior, and a negative-electrode carbon material recovery opening for taking out the negative-electrode carbon material from the interior and a cooling tank connected in an airtight manner to the negative-electrode carbon material recovery opening of the heat-treatment furnace, and provided with a cooling means.Type: GrantFiled: September 7, 2017Date of Patent: August 7, 2018Assignee: NIPPON POWER GRAPHITE CO., LTD.Inventors: Tatsuo Umeno, Tadanori Tsunawaki, Shinya Okabe, Shirou Oie, Jyugo Sumitomo, Shigeyosi Nakano
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Publication number: 20180013127Abstract: An apparatus for manufacturing a lithium-ion secondary cell negative-electrode carbon material by heat-treating carbon particles while causing the carbon particles to flow within a heat-treatment furnace, the apparatus having a heat-treatment furnace provided with a carbon-particle supply opening for supplying the carbon particles into the interior, and a negative-electrode carbon material recovery opening for taking out the negative-electrode carbon material from the interior and a cooling tank connected in an airtight manner to the negative-electrode carbon material recovery opening of the heat-treatment furnace, and provided with a cooling means.Type: ApplicationFiled: September 7, 2017Publication date: January 11, 2018Applicant: NIPPON POWER GRAPHITE CO., LTD.Inventors: TATSUO UMENO, TADANORI TSUNAWAKI, SHINYA OKABE, SHIROU OIE, JYUGO SUMITOMO, SHIGEYOSI NAKANO
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Patent number: 9312532Abstract: A negative electrode material for lithium ion secondary batteries comprises amorphous coated particles that are composed of a plurality of consolidated particles having no specific shape, said consolidated particles being obtained by consolidating a plurality of primary spheroidized graphite particles, and 0.5-20% by mass of an amorphous carbon layer that covers the surfaces of the consolidated particles and binds the consolidated particles with each other; and 0.5-20% by mass of a highly crystalline carbon layer that is formed so as to cover the outer surfaces of the amorphous coated particles and has an interplanar distance ascribed to CVD processing of 0.335 nm or more but less than 0.3369 nm. The negative electrode material for lithium ion secondary batteries is also characterized by having a porosity of 5% by volume or less, and a method for producing the negative electrode material for lithium ion secondary batteries.Type: GrantFiled: December 6, 2011Date of Patent: April 12, 2016Assignee: Nippon Coke & Engineering Co., Ltd.Inventors: Tatsuo Umeno, Tadanori Tsunawaki, Koutarou Mizuma, Shinya Okabe, Shiroh Oie
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Publication number: 20150303447Abstract: The present invention provides an apparatus for manufacturing a lithium-ion secondary cell negative-electrode carbon material by heat-treating carbon particles while causing the carbon particles to flow within a heat-treatment furnace, the apparatus for manufacturing a lithium-ion secondary battery negative-electrode carbon material having: a heat-treatment furnace provided with a carbon-particle supply opening for supplying the carbon particles into the interior, and a negative-electrode carbon material recovery opening for taking out the negative-electrode carbon material from the interior; and a cooling tank connected in an airtight manner to the negative-electrode carbon material recovery opening of the heat-treatment furnace, and provided with a cooling means. Also provided is a method for manufacturing a lithium-ion secondary battery negative-electrode carbon material by using the apparatus.Type: ApplicationFiled: August 27, 2013Publication date: October 22, 2015Inventors: Tatsuo UMENO, Tadanori TSUNAWAKI, Shinya OKABE, Shirou OIE, Jyugo SUMITOMO, Shigeyosi NAKANO
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Publication number: 20130309578Abstract: A negative electrode material for lithium ion secondary batteries comprises amorphous coated particles that are composed of a plurality of consolidated particles having no specific shape, said consolidated particles being obtained by consolidating a plurality of primary spheroidized graphite particles, and 0.5-20% by mass of an amorphous carbon layer that covers the surfaces of the consolidated particles and binds the consolidated particles with each other; and 0.5-20% by mass of a highly crystalline carbon layer that is formed so as to cover the outer surfaces of the amorphous coated particles and has an interplanar distance ascribed to CVD processing of 0.335 nm or more but less than 0.3369 nm. The negative electrode material for lithium ion secondary batteries is also characterized by having a porosity of 5% by volume or less, and a method for producing the negative electrode material for lithium ion secondary batteries.Type: ApplicationFiled: December 6, 2011Publication date: November 21, 2013Inventors: Tatsuo Umeno, Tadanori Tsunawaki, Koutarou Mizuma, Shinya Okabe, Shiroh Oie
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Patent number: 8329136Abstract: The present invention relates to a graphite particle and a carbon-graphite composite particle both suitable for use in electrode for lithium ion secondary battery, as well as to processes for producing these particles. The graphite particle of the present invention has an average particle diameter of 5 to 50 ?m, wherein one or more recesses having a depth of 0.1 to 10 ?m are formed in the surface. The graphite particle is produced by a mixing step for mixing raw material graphite particles and recess-forming particles, a press molding step for press-molding the mixture composed of the raw material graphite particles and the recess-forming particles to obtain a molded article, a pulverization step for pulverizing the molded article, and a separation step for separating and removing the recess-forming particles from the pulverized molded article.Type: GrantFiled: December 13, 2006Date of Patent: December 11, 2012Assignee: Nippon Coke & Engineering Company, LimitedInventors: Tatsuo Umeno, Takashi Iwao
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Publication number: 20090258298Abstract: The present invention relates to a graphite particle and a carbon-graphite composite particle both suitable for use in electrode for lithium ion secondary battery, as well as to processes for producing these particles. The graphite particle of the present invention has an average particle diameter of 5 to 50 ?m, wherein one or more recesses having a depth of 0.1 to 10 ?m are formed in the surface. The graphite particle is produced by a mixing step for mixing raw material graphite particles and recess-forming particles, a press molding step for press-molding the mixture composed of the raw material graphite particles and the recess-forming particles to obtain a molded article, a pulverization step for pulverizing the molded article, and a separation step for separating and removing the recess-forming particles from the pulverized molded article.Type: ApplicationFiled: December 13, 2006Publication date: October 15, 2009Applicant: MITSUI MINING CO., LTD.Inventors: Tatsuo Umeno, Takashi Iwao
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Publication number: 20060238958Abstract: The objects of the present invention are to improve characteristics of electric double layer capacitors, such as energy density and charge-and-discharge rate, and to provide a positive electrode for electric double layer capacitors useful for the foregoing object, and a simple method for its production. Disclosed is a positive electrode for electric double layer capacitors comprising graphite-carbon composite particles, the graphite-carbon composite particle being composed of a graphite particle and a carbon layer covering the graphite particle.Type: ApplicationFiled: April 24, 2006Publication date: October 26, 2006Applicants: Power Systems Co., Ltd., Masaki Yoshio, Mitsui Mining Company, LimitedInventors: Hitoshi Nakamura, Keiichi Hayashi, Hidetoshi Ohta, Taiji Nakagawa, Masaki Yoshio, Tatsuo Umeno
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Patent number: 6939526Abstract: Graphite particles having a bent laminate structure inside each particle are produced by feeding, into an impact grinder, graphite particles having an average particle diameter of 5 mm or less together with a gas current to apply an impact to the graphite particles to form, by a compression force, a bent laminate structure inside each graphite particle. The resulting graphite particles have an average particle diameter of 100 ?m or less, are low in anisotropy, have a nearly spherical shape, and are highly crystalline.Type: GrantFiled: May 23, 2002Date of Patent: September 6, 2005Assignee: Mitsui Mining Co., Ltd.Inventors: Kenji Fukuda, Tadanori Tsunawaki, Tatsuo Umeno, Kohei Murayama, Youichiro Hara
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Patent number: 6884545Abstract: An anode material for lithium secondary battery, which comprises graphite particles and a crystalline carbon coating layer formed thereon, wherein each graphite particle has a bent laminate structure inside, is produced by grinding a graphite of 5 mm or less in average particle diameter using an impact grinder to produce graphite particles of 100 ?m or less in average particle diameter having a bent laminate structure inside each particle and then subjecting the graphite particles to chemical vapor deposition in a fluidized bed type reaction furnace to form a crystalline carbon coating layer on the graphite particles.Type: GrantFiled: June 7, 2002Date of Patent: April 26, 2005Assignee: Mitsui Mining Co., Ltd.Inventors: Kenji Fukuda, Tadanori Tsunawaki, Tatsuo Umeno, Kohei Murayama, Yoshinori Yasumoto, Youichiro Hara
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Patent number: 6797202Abstract: The present invention can provide particles for electro-rheological fluid for providing a high electro-rheological effect over a wide temperature range at low electric power consumption, and having high strength and excellent durability, not being susceptible to break-up due to the load of stress. Particles for an electro-rheological fluid of the present invention comprise spherical carbonaceous particles, obtained substantially from a solvent and a condensation product of a methylene type bond of aromatic sulfonic acid or a salt thereof.Type: GrantFiled: March 5, 2002Date of Patent: September 28, 2004Assignees: Bridgestone Corporaton, Mitsui Mining Company, LimitedInventors: Shigeki Endo, Howard See, Tasuku Saito, Koji Sakata, Kenji Fukuda, Youichiro Hara, Tatsuo Umeno
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Patent number: 6770399Abstract: The present invention discloses a composite material for anode of lithium secondary battery, comprising: a porous particle nucleus formed by bonding of at least silicon-containing particles and carbon-containing particles, and a carbon-made covering layer formed thereon; and a process for producing such a composite material. The composite material has an average particle diameter of preferably 0.1 to 50 &mgr;m and a specific surface area of preferably 5 m2/g or less. In the composite material, the silicon content in the porous particle nucleus is 10 to 90% by mass.Type: GrantFiled: October 31, 2001Date of Patent: August 3, 2004Assignee: Mitsui Mining Co., Ltd.Inventors: Tatsuo Umeno, Kenji Fukuda, Tadanori Tsunawaki, Youichiro Hara
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Publication number: 20020197534Abstract: An anode material for lithium secondary battery, which comprises graphite particles and a crystalline carbon coating layer formed thereon, wherein each graphite particle has a bent laminate structure inside, is produced by grinding a graphite of 5 mm or less in average particle diameter using an impact grinder to produce graphite particles of 100 &mgr;m or less in average particle diameter having a bent laminate structure inside each particle and then subjecting the graphite particles to chemical vapor deposition in a fluidized bed type reaction furnace to form a crystalline carbon coating layer on the graphite particles.Type: ApplicationFiled: June 7, 2002Publication date: December 26, 2002Applicant: Mitsui Mining Co., Ltd.Inventors: Kenji Fukuda, Tadanori Tsunawaki, Tatsuo Umeno, Kohei Murayama, Yoshinori Yasumoto, Youichiro Hara
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Publication number: 20020197201Abstract: Graphite particles having a bent laminate structure inside each particle are produced by feeding, into an impact grinder, graphite particles having an average particle diameter of 5 mm or less together with a gas current to apply an impact to the graphite particles to form, by a compression force, a bent laminate structure inside each graphite particle. The resulting graphite particles have an average particle diameter of 100 &mgr;m or less, are low in anisotropy, have a nearly spherical shape, and are highly crystalline.Type: ApplicationFiled: May 23, 2002Publication date: December 26, 2002Applicant: Mitsui Mining Co., Ltd.Inventors: Kenji Fukuda, Tadanori Tsunawaki, Tatsuo Umeno, Kohei Murayama, Youichiro Hara
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Publication number: 20020130429Abstract: The present invention can provide particles for electro-rheological fluid for providing a high electro-rheological effect over a wide temperature range at low electric power consumption, and having high strength and excellent durability, not being susceptible to break-up due to the load of stress. Particles for an electro-rheological fluid of the present invention comprise spherical carbonaceous particles, obtained substantially from a solvent and a condensation product of a methylene type bond of aromatic sulfonic acid or a salt thereof.Type: ApplicationFiled: March 5, 2002Publication date: September 19, 2002Applicant: Bridgestone CorporationInventors: Shigeki Endo, Howard See, Tasuku Saito, Koji Sakata, Kenji Fukuda, Youichiro Hara, Tatsuo Umeno
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Patent number: 6432583Abstract: According to the present invention, there are disclosed: a process for producing an anode material for lithium secondary battery, comprising graphite particles and a crystalline carbon layer covering the whole surfaces of the graphite particles, wherein the whole surfaces of the graphite particles are covered with a carbon layer in a state that the surfaces of the graphite particles and the carbon 002 plane of the carbon layer are parallel, which process comprises subjecting graphite particles to a treatment for chemical vapor deposition in a fluidized bed type reactor at 900 to 1,200° C., using a mixed gas consisting of an organic substance gas and an inert gas, the molar concentration of the organic substance gas in the mixed gas being 2 to 50%; and an anode material for lithium secondary battery, produced by the above process.Type: GrantFiled: January 27, 2000Date of Patent: August 13, 2002Assignee: Mitsui Mining Co., Ltd.Inventors: Kenji Fukuda, Youichiro Hara, Tatsuo Umeno, Takashi Hiruta, Yoshinori Yasumoto, Tadanori Tsunawaki, Katsusuke Iwanaga, Osamu Matsunaga
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Publication number: 20020086211Abstract: The present invention discloses a composite material for anode of lithium secondary battery, comprising:Type: ApplicationFiled: October 31, 2001Publication date: July 4, 2002Applicant: Mitsui Mining Co., Ltd.Inventors: Tatsuo Umeno, Kenji Fukuda, Tadanori Tsunawaki, Youichiro Hara