Patents by Inventor Atsuo Yamada

Atsuo Yamada 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: 6805985
    Abstract: A fuel cell usable as a small-sized secondary cell such as a button type cell and a fuel cell system including the fuel cells are provided. The fuel cell has a first electrode, an electrolyte membrane, a second electrode, and a hydrogen storing material. The electrolyte membrane has polyfullerene hydroxide as a proton conductor. When a negative voltage is applied to the first electrode and a positive electrode is applied to the second electrode, protons, electrons, and oxygen are generated from water at the second electrode, and hydrogen is generated from the electrons and the protons at the first electrode. The hydrogen thus generated is stored in the hydrogen storing material, thus performing so-called charging. At the time of power generation, protons and electrons are generated, at the first electrode, from hydrogen supplied from the hydrogen storing material, and the generated protons are conducted to the second electrode via the electrolyte membrane and water is generated at the second electrode.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: October 19, 2004
    Assignee: Sony Corporation
    Inventors: Atsuo Yamada, Masafumi Ata
  • Patent number: 6794598
    Abstract: An arc electrode structure, for producing carbon nanostructures, which includes a first electrode and two or more second electrodes disposed within a chamber is provided. The electrodes are connected to a voltage potential to produce an arc-plasma region. The first electrode has a sloped surface with a plurality of holes therein for holding catalyst. The first electrode's sloped surface, and the positioning of the plurality of second electrodes allows control of the direction and region of arc-plasma. Further, the first electrode has a central bore which may be either a blind bore, or a through bore. The blind bore collects unwanted deposits that slide off of the sloped surface of the first electrode. The throughbore either allows soot and carbon nanostructures to be removed from the chamber, or allows organic vapor to be introduced into the chamber.
    Type: Grant
    Filed: July 25, 2003
    Date of Patent: September 21, 2004
    Assignee: Sony Corporation
    Inventors: Houjin Huang, Hisashi Kajiura, Mitsuaki Miyakoshi, Atsuo Yamada, Masashi Shiraishi
  • Patent number: 6749967
    Abstract: A positive electrode active material and a non-aqueous electrolyte cell which uses the positive electrode active material. The cell has a high discharge voltage without lowering the capacity and superior charging/discharging characteristics. To this end, the positive electrode active material contains a compound represented by the general formula LixMnyFe1-yPO4, wherein 0<x≦2 and 0.5<y<0.95, or a compound represented by the general formula LixMnyA1-yPO4, where 0<x≦2 and 0<y<1 and wherein A is a metal element selected from among Ti, Zn, Mg and Co or plural metal elements selected from among Ti, Fe, Zn, Mg and Co.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: June 15, 2004
    Assignee: Sony Corporation
    Inventors: Guohua Li, Atsuo Yamada
  • Patent number: 6746799
    Abstract: A lithium ion cell less costly than a control lithium ion cell is provided. The lithium ion cell is improved appreciably in operational stability under special conditions, such as high temperatures, and exhibits superior characteristics against over-discharging, while guaranteeing compatibility to the operating voltage of a conventional lithium ion cell and an energy density equivalent to that of the conventional lithium ion cell. To this end, the lithium ion cell includes a positive electrode, a negative electrode and a non-aqueous electrolyte, and uses, as a positive electrode active material, a composite material of a first lithium compound represented by the general formula LixMyPO4, where 0<x<2, 0.8<y<1.2 and M contains Fe, and a second lithium compound having a potential holder than the potential of the first lithium compound.
    Type: Grant
    Filed: April 25, 2001
    Date of Patent: June 8, 2004
    Assignee: Sony Corporation
    Inventors: Atsuo Yamada, Takayuki Yamahira
  • Publication number: 20040076561
    Abstract: A hydrogen storing and desorbing apparatus is adapted to store hydrogen by a hydrogen storage material and desorb the stored hydrogen from a hydrogen storage material. The hydrogen storing and desorbing apparatus comprises a pressure-proof vessel (2), a cartridge (3) having an outside diameter smaller than the inside diameter of the pressure-proof vessel and an outer peripheral wall part (3a) and a bottom wall part (3b) made of a porous material and capable of providing a carbonaceous material therein, legs (6) for holding the cartridge (3) in the pressure-proof vessel (2) so that the bottom wall part is spaced from the bottom surface (2b) of the pressure-proof vessel (2) and the outer peripheral wall part is spaced from the inner side surface (2a) of the pressure-proof vessel (2), gas passages (11a) and (11b) connected to the pressure-proof vessel (2), valves (12a) and (12b) provided in the gas passages and a hydrogen gas supply source (14) connected to the pressure-proof vessel (2) by the gas passage.
    Type: Application
    Filed: January 31, 2003
    Publication date: April 22, 2004
    Inventors: Hisashi Kajiura, Masashi Shiraishi, Eisuke Negishi, Masafumi Ata, Atsuo Yamada
  • Publication number: 20040058213
    Abstract: The present invention is relative with a power generating apparatus including a proton conductor unit (6), containing a fullerene derivative, a hydrogen electrode (4) bonded to one surface of the proton conductor unit (6), an oxygen electrode (5) bonded to the other surface of the proton conductor unit (6), and a hydrogen gas supplying unit (2) for supplying a hydrogen gas at a pressure of approximately 0.2 to approximately 3.5 atm to the hydrogen electrode (4). The present power generating apparatus effectively suppresses transmission of hydrogen and oxygen gases so that it is possible to prevent the hydrogen gas from being emitted to atmosphere due to transmission as well as to prevent the oxygen gas from reaching the hydrogen electrode on transmission to prevent the hydrogen gas from being consumed without contributing to power generation.
    Type: Application
    Filed: July 15, 2003
    Publication date: March 25, 2004
    Inventors: Atsuo Yamada, Hisashi Kajiura, Masashi Shiraishi, Ryuichiro Maruyama, Yasuhiro Watanabe, Takahiro Nakamura, Hiroshi Miyazawa
  • Publication number: 20040050686
    Abstract: An arc electrode structure, for producing carbon nanostructures, which includes a first electrode and two or more second electrodes disposed within a chamber. The electrodes are connected to a voltage potential to produce an arc-plasma region. The first electrode has a sloped surface with a plurality of holes therein for holding catalyst. The first electrode's sloped surface, and the positioning of the plurality of second electrodes allows control of the direction and region of arc-plasma. Further, the first electrode has a central bore which may be either a blind bore, or a through bore. The blind bore collects unwanted deposits that slide off of the sloped surface of the first electrode. The throughbore either allows soot and carbon nanostructures to be removed from the chamber, or allows organic vapor to be introduced into the chamber.
    Type: Application
    Filed: July 25, 2003
    Publication date: March 18, 2004
    Inventors: Houjin Huang, Hisashi Kajiura, Mitsuaki Miyakoshi, Atsuo Yamada, Masashi Shiraishi
  • Publication number: 20040002003
    Abstract: A non-aqueous electrolyte secondary battery employing a positive electrode active material containing a compound represented by the general formula LixMyPO4, where 0<x≦2 and 0.8≦y≦1.2, with M containing a 3d transition metal, where LixMyPO4 encompasses that with the grain size not larger than 10 &mgr;m. The non-aqueous electrolyte secondary battery has superior cyclic characteristics and a high capacity.
    Type: Application
    Filed: June 30, 2003
    Publication date: January 1, 2004
    Inventors: Atsuo Yamada, Guohua Li, Hideto Azuma
  • Patent number: 6632566
    Abstract: A non-aqueous electrolyte secondary battery employing a positive electrode active material containing a compound represented by the general formula LixMyPO4, where 0<x≦2 and 0.8≦y≦1.2, with M containing a 3d transition metal, where LixMyPO4 encompasses that with the grain size not larger than 10 &mgr;m. The non-aqueous electrolyte secondary battery has superior cyclic characteristics and a high capacity.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: October 14, 2003
    Assignee: Sony Corporation
    Inventors: Atsuo Yamada, Guohua Li, Hideto Azuma
  • Publication number: 20030015414
    Abstract: An arc discharge is generated between a pair of carbon rod electrodes 1 and 2 and gas containing carbon is supplied to a part between the pair of carbon electrodes 1 and 2 from a gas supply pipe 8 or a through bole 16, so that a large amount of fullerenes, especially carbon nanotubes is simply produced with high yield.
    Type: Application
    Filed: December 18, 2001
    Publication date: January 23, 2003
    Inventors: Hisashi Kajiura, Mitsuaki Miyakoshi, Masashi Shiraishi, Masafumi Ata, Atsuo Yamada
  • Publication number: 20020106541
    Abstract: A fuel cell usable as a small-sized secondary cell such as a button type cell and a fuel cell system including the fuel cells are provided. The fuel cell has a first electrode, an electrolyte membrane, a second electrode, and a hydrogen storing material. The electrolyte membrane has polyfullerene hydroxide as a proton conductor. When a negative voltage is applied to the first electrode and a positive electrode is applied to the second electrode, protons, electrons, and oxygen are generated from water at the second electrode, and hydrogen is generated from the electrons and the protons at the first electrode. The hydrogen thus generated is stored in the hydrogen storing material, thus performing so-called charging. At the time of power generation, protons and electrons are generated, at the first electrode, from hydrogen supplied from the hydrogen storing material, and the generated protons are conducted to the second electrode via the electrolyte membrane and water is generated at the second electrode.
    Type: Application
    Filed: October 31, 2001
    Publication date: August 8, 2002
    Inventors: Atsuo Yamada, Masafumi Ata
  • Patent number: 6376811
    Abstract: A heating apparatus 1 for preventing increase of the temperature difference on the heating surfaces and occurrence of heat spots in a broad temperature range including a high temperature region includes a substrate 2 made of a ceramic material with a heating surface 2A, a plurality of resistance-heating elements 3 and 4 buried in said substance 2, pairs of terminals 5 and 6, each pair of the terminals 6 and 5 being attached to a respective one of the resistance-heating elements to supply alternating current there to, and AC power sources 11A and 11B each connected to respective one of said pairs of the terminals 6 and 5 for the respective resistance-heating elements to supply the alternating current thereto. Insulating transformers 10A and 10B each are interposed between the respective AC power source and the pair of the terminals.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: April 23, 2002
    Assignee: NGK Insulators, Ltd.
    Inventors: Shinji Yamaguchi, Atsuo Yamada
  • Publication number: 20020004169
    Abstract: A lithium ion cell less costly than a control lithium ion cell is provided. The lithium ion cell is improved appreciably in operational stability under special conditions, such as high temperatures, and exhibits superior characteristics against over-discharging, while guaranteeing compatibility to the operating voltage of a conventional lithium ion cell and an energy density equivalent to that of the conventional lithium ion cell. To this end, the lithium ion cell includes a positive electrode, a negative electrode and a non-aqueous electrolyte, and uses, as a positive electrode active material, a composite material of a first lithium compound represented by the general formula LixMyPO4, where 0<x<2, 0.8<y<1.2 and M contains Fe, and a second lithium compound having a potential holder than the potential of the first lithium compound.
    Type: Application
    Filed: April 25, 2001
    Publication date: January 10, 2002
    Inventors: Atsuo Yamada, Takayuki Yamahira
  • Publication number: 20010055718
    Abstract: A positive electrode active material and a non-aqueous electrolyte cell which uses the positive electrode active material. The cell has a high discharge voltage without lowering the capacity and superior charging/discharging characteristics. To this end, the positive electrode active material contains a compound represented by the general formula LixMnyFe1-yPO4, wherein 0<x≦2 and 0.5<y<0.95, or a compound represented by the general formula LixMnyA1-yPO4, where 0<x≦2 and 0<y<1 and wherein A is a metal element selected from among Ti, Zn, Mg and Co or plural metal elements selected from among Ti, Fe, Zn, Mg and Co.
    Type: Application
    Filed: April 25, 2001
    Publication date: December 27, 2001
    Inventors: Guohua Li, Atsuo Yamada
  • Publication number: 20010027972
    Abstract: A heating apparatus 1 for preventing increase of the temperature difference on the heating surfaces and occurrence of heat spots in a broad temperature range including a high temperature region is disclosed. The heating apparatus 1 comprises a substrate 2 made of a ceramic material with a heating surface 2A, a plurality of resistance-heating elements 3 and 4 buried in said substance 2, pairs of terminals 3 and 4, each pair of the terminals 6 and 5 being attached to a respective one of the resistance-heating elements to supply alternating current there to, and AC power sources 11A and 11B each connected to respective one of said pairs of the terminals 6 and 5 for the respective resistance-heating elements to supply the alternating current thereto. Insulating transformers 10A and 10B each are interposed between the respective AC power source and the pair of the terminals.
    Type: Application
    Filed: January 31, 2001
    Publication date: October 11, 2001
    Applicant: NGK Insulators,Ltd.
    Inventors: Shinji Yamaguchi, Atsuo Yamada
  • Publication number: 20010016283
    Abstract: A carbonaceous material for hydrogen storage capable of storing hydrogen in the form of protons is provided. The carbonaceous material is composed of molecules having structural curvatures and has a work function of 4.9 eV or more. The carbonaceous material can be produced by an arc discharge process using a carbon based electrode. Examples of these carbonaceous materials include a baked body composed of a polymer produced from fullerenes by baking thereof, a polymer produced from fullerenes by electrolytic polymerization, a carbonaceous derivative produced by introducing groups allowing hydrogen bonding with protons to a carbonaceous material, and a carbonaceous material composed of molecules having structural bending portions. The carbonaceous materials for hydrogen storage are used for electrochemical devices, such as an alkali battery, air cell, and a fuel cell.
    Type: Application
    Filed: March 11, 2001
    Publication date: August 23, 2001
    Inventors: Masashi Shiraishi, Eisuke Negishi, Koichiro Hinokuma, Atsuo Yamada, Hisashi Kajiura, Koichi Tanaka, Masafumi Ata
  • Patent number: 5341450
    Abstract: Disclosed herein is an optical waveguide device of LiNbO.sub.3 which guides efficiently both or either of ordinary ray and extraordinary ray of visible light in the short wavelength region. It is prepared by forming an LiNbO.sub.3 thin film optical waveguide on an LiNbO.sub.3 substrate undoped or doped with MgO, with or without a base layer interposed between them, by liquid phase epitaxy which employs Li.sub.2 O-B.sub.2 O.sub.3 as the flux.
    Type: Grant
    Filed: March 31, 1992
    Date of Patent: August 23, 1994
    Assignee: Sony Corporation
    Inventors: Atsuo Yamada, Hitoshi Tamada, Masaki Saitoh
  • Patent number: 5150447
    Abstract: An optical waveguide, a dielectric device and method for fabricating such devices in which a substrate is polarized in a first direction and a dielectric thin film is formed on the surface of the substrate and polarized in the opposite direction to the substrate. Parallel grooves may be formed in the substrate. In one embodiment, a first dielectric thin film is formed on the substrate and is formed with grooves and is polarized in the same direction as the substrate. Then, a second dielectric thin film is formed over the first dielectric thin film and it is polarized in a direction which is opposite to the substrate and the first thin film.
    Type: Grant
    Filed: August 20, 1991
    Date of Patent: September 22, 1992
    Assignee: Sony Corporation
    Inventors: Hitoshi Tamada, Atsuo Yamada, Yukie Taneyama, Masaki Saitoh