Patents by Inventor Tadashi Sotomura

Tadashi Sotomura 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).

  • Patent number: 7695850
    Abstract: The present invention is usable in oxygen electrodes and air electrodes for air cells, fuel cells, electrochemical sensors and like electrochemical devices. The present invention provides a very stable oxygen-reducing electrode that can achieve electrochemical reduction of oxygen at a noble potential.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: April 13, 2010
    Assignee: Panasonic Corporation
    Inventors: Tadashi Sotomura, Mitsuru Hashimoto, Yuka Yamada
  • Publication number: 20080283413
    Abstract: It is an object of the present invention to provide an oxygen reduction electrode which provides four-electron reduction reaction with high selectivity in the reaction of reducing oxygen. The present invention involves a method of manufacturing an electrode for reducing oxygen used for four-electron reduction of oxygen, having (1) a first step wherein a charcoal-based material is obtained by carbonization of a starting material comprising a nitrogen-containing synthetic polymer, and (2) a second step wherein the electrode for reducing oxygen is manufactured using an electrode material comprising the charcoal-based material.
    Type: Application
    Filed: December 28, 2007
    Publication date: November 20, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Masa-aki Suzuki, Yuka Yamada, Nobuyasu Suzuki, Yasunori Morinaga, Hidehiro Sasaki, Tadashi Sotomura, Mitsuru Hashimoto, Masahiro Deguchi, Akira Taomoto, Toyokazu Ozaki
  • Publication number: 20070243449
    Abstract: The present invention is usable in oxygen electrodes and air electrodes for air cells, fuel cells, electrochemical sensors and like electrochemical devices. The present invention provides a very stable oxygen-reducing electrode that can achieve electrochemical reduction of oxygen at a noble potential. The oxygen-reducing electrode of the present invention contains a cobalt tetrapyrazinoporphyrazine derivative represented by the following Structural Formula (1) as a catalytic component.
    Type: Application
    Filed: June 13, 2007
    Publication date: October 18, 2007
    Inventors: Tadashi Sotomura, Mitsuru Hashimoto, Yuka Yamada
  • Patent number: 7129000
    Abstract: For utilizing the chemical energy of a sugar directly as electric energy, electrolytic oxidation of a sugar on the negative electrode associated with cleavage of a carbon-carbon bond thereof is employed, thereby generating an electromotive force between the positive electrode and the negative electrode having an electrolyte therebetween. For an efficient oxidation of a sugar, it is effective for the negative electrode to have a component capable of forming a coordination compound with a sugar via a hydroxyl group thereof. Such a component may comprise a metal element capable of forming an amphoteric hydroxide. Use of an oxygen electrode as the positive electrode gives a battery capable of efficiently converting the chemical energy of a sugar into electric energy.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: October 31, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tadashi Sotomura, Isao Taniguchi
  • Patent number: 7115338
    Abstract: A positive electrode, a negative electrode, and an electrolyte intervening between the positive electrode and the negative electrode are employed, and a molecule capable of being excited due to absorption of light and electrochemically oxidizing carbohydrate is provided at at least either the negative electrode or the electrolyte, with production of electromotive force occurring between the positive electrode and the negative electrode as a result of supply of carbohydrate while the molecule is irradiated with light and oxidization of carbohydrate by the molecule at the negative electrode. This method makes it possible for the chemical energy which carbohydrates possess to be directly utilized as electrical energy.
    Type: Grant
    Filed: May 24, 2005
    Date of Patent: October 3, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Tadashi Sotomura
  • Publication number: 20060127745
    Abstract: The present invention provides an electrode comprising on an electrode substrate a catalytic layer comprising catalytically active particles and a solid polymer comprising a component represented by Structural Formula (1) below: wherein R1, R2, R3, and R4 are the same or different, and independently represent a hydrogen atom or C1-8 univalent hydrocarbon group, and m and n are independently an integer from 2 to 4; a fuel cell comprising the catalytic layer; and a fuel cell for bioimplantation whose surface is coated with the solid polymer.
    Type: Application
    Filed: February 3, 2006
    Publication date: June 15, 2006
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Hidehiro Sasaki, Nobuyasu Suzuki, Yasunori Morinaga, Yuka Yamada, Tadashi Sotomura
  • Publication number: 20050281729
    Abstract: It is an object of the present invention to provide an oxygen reduction electrode which provides four-electron reduction reaction with high selectivity in the reaction of reducing oxygen. The present invention involves a method of manufacturing an electrode for reducing oxygen used for four-electron reduction of oxygen, having (1) a first step wherein a charcoal-based material is obtained by carbonization of a starting material comprising a nitrogen-containing synthetic polymer, and (2) a second step wherein the electrode for reducing oxygen is manufactured using an electrode material comprising the charcoal-based material.
    Type: Application
    Filed: July 12, 2005
    Publication date: December 22, 2005
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Masa-aki Suzuki, Yuka Yamada, Nobuyasu Suzuki, Yasunori Morinaga, Hidehiro Sasaki, Tadashi Sotomura, Mitsuru Hashimoto, Masahiro Deguchi, Akira Taomoto, Toyokazu Ozaki
  • Publication number: 20050221169
    Abstract: A positive electrode, a negative electrode, and an electrolyte intervening between the positive electrode and the negative electrode are employed, and a molecule capable of being excited due to absorption of light and electrochemically oxidizing carbohydrate is provided at at least either the negative electrode or the electrolyte, with production of electromotive force occurring between the positive electrode and the negative electrode as a result of supply of carbohydrate while the molecule is irradiated with light and oxidization of carbohydrate by the molecule at the negative electrode. This method makes it possible for the chemical energy which carbohydrates possess to be directly utilized as electrical energy.
    Type: Application
    Filed: May 24, 2005
    Publication date: October 6, 2005
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventor: Tadashi Sotomura
  • Patent number: 6939630
    Abstract: A composite electrode for reducing oxygen that provides the quasi four-electron reduction at selectivity of nearly 100% is provided. The composite electrode includes an electrochemical catalyst A that produces hydrogen peroxide by reducing oxygen and a catalyst B that decomposes the produced hydrogen peroxide to oxygen.
    Type: Grant
    Filed: August 29, 2002
    Date of Patent: September 6, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tadashi Sotomura, Takeo Ohsaka
  • Publication number: 20050153198
    Abstract: Methods of effectively utilizing yeast-containing waste products generated after yeast use can be applied to absorbing agents, drying agents, soil conditioners, catalysts, and other common applications in the same manner as to charcoal-based materials of other materials by carbonizing the waste product, but a new search was needed in order to broaden the industrial utilization of these products. By supporting a particulate or powdered charcoal-based material obtained by carbonizing a yeast-containing material on an electrically conductive gas-permeable base, an electrode can be obtained that is capable of the electrochemical reduction of oxygen. The present charcoal-based material can provide new applications that have not been hitherto proposed, in the sense that oxygen can be electrochemically reduced smoothly and at a small overvoltage (resistance), and a large electromotive force can be obtained, by placing the charcoal-based material at the intersection of the ion path and the oxygen path.
    Type: Application
    Filed: December 7, 2004
    Publication date: July 14, 2005
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Masa-aki Suzuki, Yuka Yamada, Nobuyasu Suzuki, Yasunori Morinaga, Hidehiro Sasaki, Tadashi Sotomura
  • Patent number: 6916576
    Abstract: A positive electrode, a negative electrode, and an electrolyte intervening between the positive electrode and the negative electrode are employed, and a molecule capable of being excited due to absorption of light and electrochemically oxidizing carbohydrate is provided at at least either the negative electrode or the electrolyte, with production of electromotive force occurring between the positive electrode and the negative electrode as a result of supply of carbohydrate while the molecule is irradiated with light and oxidization of carbohydrate by the molecule at the negative electrode. This method makes it possible for the chemical energy which carbohydrates possess to be directly utilized as electrical energy.
    Type: Grant
    Filed: September 14, 2001
    Date of Patent: July 12, 2005
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Tadashi Sotomura
  • Publication number: 20030203275
    Abstract: For utilizing the chemical energy of a sugar directly as electric energy, electrolytic oxidation of a sugar on the negative electrode associated with cleavage of a carbon-carbon bond thereof is employed, thereby generating an electromotive force between the positive electrode and the negative electrode having an electrolyte therebetween. For an efficient oxidation of a sugar, it is effective for the negative electrode to have a component capable of forming a coordination compound with a sugar via a hydroxyl group thereof. Such a component may comprise a metal element capable of forming an amphoteric hydroxide. Use of an oxygen electrode as the positive electrode gives a battery capable of efficiently converting the chemical energy of a sugar into electric energy.
    Type: Application
    Filed: April 29, 2003
    Publication date: October 30, 2003
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Tadashi Sotomura, Isao Taniguchi
  • Patent number: 6596431
    Abstract: For utilizing the chemical energy of a sugar directly as electric energy, electrolytic oxidation of a sugar on the negative electrode associated with cleavage of a carbon-carbon bond thereof is employed, thereby generating an electromotive force between the positive electrode and the negative electrode having an electrolyte therebetween. For an efficient oxidation of a sugar, it is effective for the negative electrode to have a component capable of forming a coordination compound with a sugar via a hydroxyl group thereof. Such a component may comprise a metal element capable of forming an amphoteric hydroxide. Use of an oxygen electrode as the positive electrode gives a battery capable of efficiently converting the chemical energy of a sugar into electric energy.
    Type: Grant
    Filed: January 16, 2001
    Date of Patent: July 22, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tadashi Sotomura, Isao Taniguchi
  • Patent number: 6576370
    Abstract: The present invention provides a positive electrode, which contains at least one organic sulfide compound selected from the group consisting of a thiolato compound and a thiol compound, and at least one selected from the group consisting of sulfur and a lithium sulfide represented by Formula (1): (LixS)n, where 0<x≦2 and n>0, a method of manufacturing the positive electrode, and a lithium battery using the positive electrode. Compared with the prior art lithium battery, the lithium battery using the positive electrode of the present invention has a greater capacity and a higher voltage. The positive electrode of the present invention effectively suppresses escape of the positive electrode active material from the positive electrode during charge and discharge operations and thus actualizes a secondary battery of high energy density having a less decrease in service capacity.
    Type: Grant
    Filed: April 21, 2000
    Date of Patent: June 10, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasushi Nakagiri, Yasuhiko Bito, Hiromu Matsuda, Tadashi Sotomura, Yoshinori Toyoguchi
  • Publication number: 20030091889
    Abstract: A composite electrode for reducing oxygen that provides the quasi four-electron reduction at selectivity of nearly 100% is provided. The composite electrode includes an electrochemical catalyst A that produces hydrogen peroxide by reducing oxygen and a catalyst B that decomposes the produced hydrogen peroxide to oxygen.
    Type: Application
    Filed: August 29, 2002
    Publication date: May 15, 2003
    Inventors: Tadashi Sotomura, Takeo Ohsaka
  • Publication number: 20030082437
    Abstract: A positive electrode, a negative electrode, and an electrolyte intervening between the positive electrode and the negative electrode are employed, and a molecule capable of being excited due to absorption of light and electrochemically oxidizing carbohydrate is provided at at least either the negative electrode or the electrolyte, with production of electromotive force occurring between the positive electrode and the negative electrode as a result of supply of carbohydrate while the molecule is irradiated with light and oxidization of carbohydrate by the molecule at the negative electrode. This method makes it possible for the chemical energy which carbohydrates possess to be directly utilized as electrical energy.
    Type: Application
    Filed: May 23, 2002
    Publication date: May 1, 2003
    Inventor: Tadashi Sotomura
  • Patent number: 6245458
    Abstract: To provide a composite electrode, which does not lose large capacity and high energy density of sulfur and proceeds oxidation-reduction reaction rapidly even at room temperature. There is disclosed in the specification that a composite electrode comprising a composition containing an organic sulfide compound having at least a thiol or thiolate group in the molecule, polyaniline, and sulfur.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: June 12, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Tadashi Sotomura
  • Patent number: 5869206
    Abstract: An electrode of the present invention comprises a complex of at least one organic disulfide compound and at least one copper ion. The electrode maintains a high charging and discharging efficiency and has favorable charge and discharge cycle characteristic without losing a high energy density that is characteristic of the organic disulfide compound.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: February 9, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Tadashi Sotomura
  • Patent number: 5665492
    Abstract: A composite electrode in which a complex of an organic disulfide compound and polyaniline is supported by a substrate of metallic copper or silver is disclosed. Also, a composite electrode in which a composition including an organic disulfide compound, polyaniline and a metallic powder of copper or silver is supported by a conductive substrate is disclosed.
    Type: Grant
    Filed: January 23, 1996
    Date of Patent: September 9, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Tadashi Sotomura
  • Patent number: 5571292
    Abstract: A method is disclosed for producing a composite electrode which can be configured in a battery. The method comprises steps of (1) preparing a solution of an organic disulfide compound in 2-pyrrolidone or its derivative, (2) adding polyaniline to the solution to dissolve, thereby obtaining a homogeneous liquid, and then (3) removing at least a part of the 2-pyrrolidone or its derivative from the homogeneous liquid to obtain a solid product wherein the organic disulfide compound and the polyaniline are homogeneously mixed.
    Type: Grant
    Filed: January 24, 1996
    Date of Patent: November 5, 1996
    Assignee: Matsushita Electronic Industrial Co., Ltd.
    Inventors: Tadashi Sotomura, Hiroshi Uemachi, Yoshiko Miyamoto, Kenichi Takeyama