Patents by Inventor Koji Tatsumi
Koji Tatsumi 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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Hydrogen storage alloy, production method therefor and nickel-hydrogen secondary battery-use cathode
Patent number: 7935305Abstract: The present invention relates to hydrogen storage alloys, methods for producing the same, and anodes produced with such alloys for nickel-hydrogen rechargeable batteries. The alloys are useful as electrode materials for nickel-hydrogen rechargeable batteries, excellent, when used as anode materials, in corrosion resistance or activity such as initial activity and high rate discharge performance, of low cost compared to the conventional alloys with a higher Co content, and recyclable. The alloys are of a composition represented by the formula (1), and has a substantially single phase structure, and the crystals thereof have an average long axis diameter of 30 to 160 ?m, or not smaller than 5 ?m and smaller than 30 ?m. The present anodes for rechargeable batteries contain at least one of these hydrogen storage alloys: RNixCoyMz??(1) (R: rare earth elements etc., M: Mg, Al, etc., 3.7?x?5.3, 0.1?y?5.0, 0.1?z?1.0, 5.1?x+y+z?5.5).Type: GrantFiled: June 4, 2010Date of Patent: May 3, 2011Assignee: Santoku CorporationInventors: Kiyofumi Takamaru, Hideaki Ikeda, Koji Tatsumi -
HYDROGEN STORAGE ALLOY, PRODUCTION METHOD THEREFOR AND NICKEL-HYDROGEN SECONDARY BATTERY-USE CATHODE
Publication number: 20100301283Abstract: The present invention relates to hydrogen storage alloys, methods for producing the same, and anodes produced with such alloys for nickel-hydrogen rechargeable batteries. The alloys are useful as electrode materials for nickel-hydrogen rechargeable batteries, excellent, when used as anode materials, in corrosion resistance or activity such as initial activity and high rate discharge performance, of low cost compared to the conventional alloys with a higher Co content, and recyclable. The alloys are of a composition represented by the formula (1), and has a substantially single phase structure, and the crystals thereof have an average long axis diameter of 30 to 160 ?m, or not smaller than 5 ?m and smaller than 30 ?m. The present anodes for rechargeable batteries contain at least one of these hydrogen storage alloys. RNixCoyMz??(1) (R: rare earth elements etc., M: Mg, Al, etc., 3.7?x?5.3, 0.1?y?5.0, 0.1?z?1.0, 5.1?x+y+z?5.Type: ApplicationFiled: June 4, 2010Publication date: December 2, 2010Applicant: SANTOKU CORPORATIONInventors: Kiyofumi Takamaru, Hideaki Ikeda, Koji Tatsumi -
Publication number: 20100196761Abstract: To provide a transition metal compound granule serving as a raw material for a cathode active material for a lithium secondary battery, which has high packing density, large volume capacity density and high safety and which is excellent in durability for charge and discharge cycles. A transition metal compound granule serving as a raw material for a positive electrode material for a lithium ion secondary battery, which comprises particles containing at least one element selected from the group consisting of nickel, cobalt and manganese and having an average particle size of the primary particles being at most 1 ?m and which is substantially spherical and has an average particle size D50 of from 10 to 40 ?m and an average pore size of at most 1 ?m.Type: ApplicationFiled: March 31, 2010Publication date: August 5, 2010Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Koji Tatsumi, Yuki Nagura, Kazuya Hiratsuka
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Patent number: 7724751Abstract: A first communication device receives an ATM cell bound for a second ATM device from a first ATM device via an ATM interface, and then the first communication device sends a data frame including the ATM cell to the second ATM device via wide area Ethernet. In addition, the first communication device sends a synchronization frame to the second ATM device via the wide area Ethernet continuously at a predetermined time interval in accordance with a clock frequency of the first ATM device. A second communication device receives the synchronization frame and measures a clock frequency of the first ATM device in accordance with a time interval of receiving the synchronization frame so as to reproduce a clock having the same frequency as the measured clock frequency. After that, the second communication device sends the clock to the second ATM device via an ATM interface.Type: GrantFiled: April 25, 2005Date of Patent: May 25, 2010Assignee: Fujitsu LimitedInventors: Norihisa Uchimoto, Koji Tatsumi, Kazuhisa Shimazaki, Koichiro Yamada, Satoshi Namura, Akio Morimoto, Michio Kusayanagi
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Patent number: 7709148Abstract: To provide a process for producing a lithium-containing composite oxide for a positive electrode of a lithium secondary battery, which has a large volume capacity density, high safety, excellent durability for charge and discharge cycles and excellent low temperature characteristics.Type: GrantFiled: December 7, 2007Date of Patent: May 4, 2010Assignee: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Tokumitsu Kato, Naoshi Saito, Koji Tatsumi, Megumi Uchida, Remi Hiraki
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Patent number: 7615315Abstract: A positive electrode material for a lithium secondary battery for high voltage high capacity use exhibiting high cycle durability and high safety. The positive electrode material is composed of particles having a composition represented by the general formula: LiaCobMgcAdOeFf (A is the group 6 transition element or the group 14 element, 0.90?a?1.10, 0.97?b?1.00, 0.0001?c?0.03, 0.0001?d?0.03, 1.98?e?2.02, 0?f?0.02 and 0.0001?c+d?0.03), and magnesium, the element A and fluorine exist uniformly in the vicinity of the surfaces of the particles.Type: GrantFiled: August 16, 2004Date of Patent: November 10, 2009Assignee: Seimi Chemical Co., Ltd.Inventors: Koji Tatsumi, Toshiaki Abe, Naoshi Saito, Manabu Suhara
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Publication number: 20090252169Abstract: A first communication device receives an ATM cell bound for a second ATM device from a first ATM device via an ATM interface, and then the first communication device sends a data frame including the ATM cell to the second ATM device via wide area Ethernet. In addition, the first communication device sends a synchronization frame to the second ATM device via the wide area Ethernet continuously at a predetermined time interval in accordance with a clock frequency of the first ATM device. A second communication device receives the synchronization frame and measures a clock frequency of the first ATM device in accordance with a time interval of receiving the synchronization frame so as to reproduce a clock having the same frequency as the measured clock frequency. After that, the second communication device sends the clock to the second ATM device via an ATM interface.Type: ApplicationFiled: June 11, 2009Publication date: October 8, 2009Applicant: Fujitsu LimitedInventors: Norihisa UCHIMOTO, Koji Tatsumi, Kazuhisa Shimazaki, Koichiro Yamada, Satoshi Namura, Akio Morimoto, Michio Kusayanagi
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Publication number: 20090243731Abstract: An apparatus includes an oscillator, a memory for storing data of a first frequency and of a first voltage, a first controller for causing the oscillator to generate a clock having a required frequency by applying a voltage on the basis of the data of the first frequency and of the first voltage, a second controller for causing the oscillator to generate a clock having a second frequency by applying a second voltage at predetermined timing, an output section for outputting data of the clock of the second frequency to a frequency counter, a writing section for updating the data of the first voltage to data of the second voltage and the data of the first frequency to data of the second frequency when a difference between the second frequency and a third frequency is within a predetermine range.Type: ApplicationFiled: March 5, 2009Publication date: October 1, 2009Applicant: FUJITSU LIMITEDInventors: Koji TATSUMI, Norihisa Uchimoto, Kazuhisa Shimazaki
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Patent number: 7504180Abstract: There is obtained a material of a positive electrode for a secondary lithium-ion cell having high cycle durability and high safety in high-voltage and high-capacity applications, which is a particulate positive electrode active material for a secondary lithium-ion cell represented by a general formula, LiaCObAcBdOeFf (A is Al or Mg, B is a group-IV transition element, 0.90?a?1.10, 0.97?b?1.00, 0.0001?c?0.03, 0.0001?d?0.03, 1.98?e?2.02, 0?f?0.02, and 0.0001?c+d?0.03), where element A, element B and fluorine are evenly present in the vicinity of the particle surfaces.Type: GrantFiled: June 6, 2003Date of Patent: March 17, 2009Assignee: Seimi Chemical Co., Ltd.Inventors: Koji Tatsumi, Manabu Suhara, Naoshi Saito, Kazushige Horichi, Yukio Jitsugiri
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Publication number: 20080131780Abstract: To provide a process for producing a lithium-containing composite oxide for a positive electrode of a lithium secondary battery, which has a large volume capacity density, high safety, excellent durability for charge and discharge cycles and excellent low temperature characteristics.Type: ApplicationFiled: December 7, 2007Publication date: June 5, 2008Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Takeshi KAWASATO, Tokumitsu Kato, Naoshi Satio, Koji Tatsumi, Megumi Uchida, Remi Hiraki
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Publication number: 20080014502Abstract: The present invention relates to hydrogen storage alloys, methods for producing the same, and anodes produced with such alloys for nickel-hydrogen rechargeable batteries. The alloys are useful as electrode materials for nickel-hydrogen rechargeable batteries, excellent, when used as anode materials, in corrosion resistance or activity such as initial activity and high rate discharge performance, of low cost compared to the conventional alloys with a higher Co content, and recyclable. The alloys are of a composition represented by the formula (1) and has a substantially single phase structure, and the crystals thereof have an average long axis diameter of 30 to 160 ?m, or not smaller than 5 ?m and smaller than 30 ?m. The present anodes for rechargeable batteries contain at least one of these hydrogen storage alloys. RNixCoyMz ??(1) (R: rare earth elements etc., M: Mg, Al, etc., 3.7?x?5.3, 0.1?y?0.5, 0.1?z?1.0, 5.1?x+y+z?5.Type: ApplicationFiled: August 13, 2007Publication date: January 17, 2008Applicant: SANTOKU CORPORATIONInventors: Kiyofumi Takamaru, Hideaki Ikeda, Koji Tatsumi
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Publication number: 20070264573Abstract: To provide a process for a lithium-containing composite oxide for a positive electrode for a lithium secondary battery, which has a large volume capacity density and high safety, and is excellent in the charge and discharge cyclic durability and low temperature characteristics. A process for producing a lithium-containing composite oxide represented by the formula LipNxMyOzFa (wherein N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than N, 0.9?p?1.2, 0.95?x?2.00, 0?y?0.05, 1.9?z?4.2 and 0?a?0.Type: ApplicationFiled: July 25, 2007Publication date: November 15, 2007Applicant: AGC Seimi Chemical Co., Ltd.Inventors: Ryoji Yamada, Koji Tatsumi, Shogo Nakaoka, Kenji Ito, Kazuya Hiratsuka
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Patent number: 7270797Abstract: To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery excellent in volume capacity density, safety, charge and discharge cyclic durability, press density and productivity, by using in expensive cobalt hydroxide and lithium carbonate. A mixture having a cobalt hydroxide powder and a lithium carbonate powder mixed so that the atomic ratio of lithium/cobalt would be from 0.98 to 1.01, is fired in an oxygen-containing atmosphere at from 250 to 700° C., and the fired product is further fired in an oxygen-containing atmosphere at from 850 to 1,050° C., or such a mixture is heated at a temperature-raising rate of at most 4° C./min in a range from 250 to 600° C. and fired in an oxygen-containing atmosphere at from 850 to 1,050° C.Type: GrantFiled: May 13, 2005Date of Patent: September 18, 2007Assignee: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Koji Tatsumi
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Patent number: 7160502Abstract: The present invention relates to a method for readily producing an anode for rechargeable batteries having conflicting properties in good balance, including the corrosion resistance and the activities such as the initial activity and the high rate discharge performance, and having excellent recyclability. The method includes the steps of mixing and molding anode materials containing an electrically conductive material and at least two kinds of AB5 type hydrogen storage alloys, wherein said alloys have substantially single phase structures and the same composition, wherein each of the alloys have an average crystal long axis diameter of 30 to 350 ?m, and wherein the alloys have different ratios (D1/D2) of the average crystal long axis diameter (D1) to the average short axis diameter (D2).Type: GrantFiled: April 9, 2002Date of Patent: January 9, 2007Assignee: Santoku CorporationInventors: Kiyofumi Takamaru, Hideaki Ikeda, Koji Tatsumi
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Publication number: 20060222951Abstract: A positive electrode material for a lithium secondary battery for high voltage high capacity use exhibiting high cycle durability and high safety. The positive electrode material is composed of particles having a composition represented by the general formula: LiaCObMgcAdOeFf (A is the group 6 transition element or the group 14 element, 0.90?a?1.10, 0.97?b?1.00, 0.0001?c>0.03, 0.0001?d?0.03, 1.98?e?2.02, 0?f?0.02 and 0.0001?c+d?0.03), and magnesium, the element A and fluorine exist uniformly in the vicinity of the surfaces of the particles.Type: ApplicationFiled: August 16, 2004Publication date: October 5, 2006Inventors: Koji Tatsumi, Toshiaki Abe, Naoshi Saito, Manabu Suhara
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Publication number: 20060154146Abstract: It is to provide a positive electrode active material for a lithium secondary battery, which has a large volume capacity density and high safety, is excellent in uniform coating properties and is excellent in the charge and discharge cyclic durability and low temperature characteristics even at a high charge voltage. A process for producing a lithium-containing composite oxide represented by the formula LipQqNxMyOzFa (wherein Q is at least one element selected from the group consisting of titanium, zirconium, niobium and tantalum, N is at least one element selected from the group consisting of Co, Mn and Ni, M is at least one element selected from the group consisting of Al, alkaline earth metal elements and transition metal elements other than the Q element and the N element, 0.9?p?1.1, 0<q?0.03, 0.97?x<1.00, 0?y<0.03, 1.9?z?2.1, q+x+y=1 and 0?a?0.Type: ApplicationFiled: March 10, 2006Publication date: July 13, 2006Applicant: Seimi Chemical Co., Ltd.Inventors: Takeshi Kawasato, Naoshi Saito, Megumi Uchida, Kazushige Horichi, Koji Tatsumi, Kunihiko Terase, Manabu Suhara
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Publication number: 20060109849Abstract: A first communication device receives an ATM cell bound for a second ATM device from a first ATM device via an ATM interface, and then the first communication device sends a data frame including the ATM cell to the second ATM device via wide area Ethernet. In addition, the first communication device sends a synchronization frame to the second ATM device via the wide area Ethernet continuously at a predetermined time interval in accordance with a clock frequency of the first ATM device. A second communication device receives the synchronization frame and measures a clock frequency of the first ATM device in accordance with a time interval of receiving the synchronization frame so as to reproduce a clock having the same frequency as the measured clock frequency. After that, the second communication device sends the clock to the second ATM device via an ATM interface.Type: ApplicationFiled: April 25, 2005Publication date: May 25, 2006Applicant: FUJITSU LIMITEDInventors: Norihisa Uchimoto, Koji Tatsumi, Kazuhisa Shimazaki, Koichiro Yamada, Satoshi Namura, Akio Morimoto, Michio Kusayanagi
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Publication number: 20050250013Abstract: There is obtained a material of a positive electrode for a secondary lithium-ion cell having high cycle durability and high safety in high-voltage and high-capacity applications, which is a particulate positive electrode active material for a secondary lithium-ion cell represented by a general formula, LiaCObAcBdOeFf (A is Al or Mg, B is a group-IV transition element, 0.90?a?1.10, 0.97?b?1.00, 0.0001?c?0.03, 0.0001?d?0.03, 1.98?e?2.02, 0?f?0.02, and 0.0001?c+d?0.03), where element A, element B and fluorine are evenly present in the vicinity of the particle surfaces.Type: ApplicationFiled: June 6, 2003Publication date: November 10, 2005Applicant: Seimi Chemical Co., Ltd.Inventors: Koji Tatsumi, Manabu Suhara, Naoshi Saito, Kazushige Horichi, Yukio Jitsugiri
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Publication number: 20050220701Abstract: To provide a process for producing a lithium-cobalt composite oxide for a positive electrode of a lithium secondary battery excellent in volume capacity density, safety, charge and discharge cyclic durability, press density and productivity, by using in expensive cobalt hydroxide and lithium carbonate. A mixture having a cobalt hydroxide powder and a lithium carbonate powder mixed so that the atomic ratio of lithium/cobalt would be from 0.98 to 1.01, is fired in an oxygen-containing atmosphere at from 250 to 700° C., and the fired product is further fired in an oxygen-containing atmosphere at from 850 to 1,050° C., or such a mixture is heated at a temperature-raising rate of at most 4° C./min in a range from 250 to 600° C. and fired in an oxygen-containing atmosphere at from 850 to 1,050° C.Type: ApplicationFiled: May 13, 2005Publication date: October 6, 2005Applicant: Seimi Chemical Co., Ltd.Inventors: Manabu Suhara, Naoshi Saito, Kazushige Horichi, Koji Tatsumi
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Publication number: 20040217327Abstract: The present invention relates to a method for readily producing an anode for rechargeable batteries having conflicting properties in good balance, including the corrosion resistance and the activities such as the initial activity and the high rate discharge performance, and having excellent recyclability. The method includes the steps of mixing and molding anode materials containing an electrically conductive material and at least two kinds of AB5 type hydrogen storage alloys, wherein said alloys have substantially single phase structures and the same composition, wherein each of the alloys have an average crystal long axis diameter of 30 to 350 &mgr;m, and wherein the alloys have different ratios (D1/D2) of the average crystal long axis diameter (D1) to the average short axis diameter (D2).Type: ApplicationFiled: December 4, 2003Publication date: November 4, 2004Inventors: Kiyofumi Takamaru, Hideaki Ikeda, Koji Tatsumi