Patents by Inventor Koji Sakata

Koji Sakata 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).

  • Publication number: 20060024014
    Abstract: On a wiring board, an optical connection cable is provided in which a wiring light cord and a conducting wire are laid out in parallel. A primary side port and a secondary side port are optically connected for wiring, and are electrically connected to confirm the connection. When both ports are electrically connected, it is possible to confirm that the primary side port and the secondary side port are connected and a circuit is formed.
    Type: Application
    Filed: November 29, 2004
    Publication date: February 2, 2006
    Inventors: Shogo Ota, Koji Sakata
  • Patent number: 6870725
    Abstract: An electric double layer capacitor, including at least one basic cell, an electrode plate, and an outer package which covers the basic cell and the electrode plate in a decompression state. The basic cell may be laminated in its thickness direction to form a layered cell and includes a separator, a pair of polarized electrodes disposed so as to sandwich the separator, a pair of collectors disposed so as to sandwich the polarized electrodes, and a gasket disposed between the pair of collectors so as to surround the pair of polarized electrodes. The electrode plate body is attached to each of the collectors located at the outermost side in a laminated direction of the layered cell. A sealing material having a higher gas barrier property than the collectors is disposed so as to seal an interface between the collectors and the electrode plate in the outer package.
    Type: Grant
    Filed: July 7, 2003
    Date of Patent: March 22, 2005
    Assignee: NEC Tokin Corporation
    Inventors: Koji Sakata, Kazuya Mimura, Yutaka Nakazawa, Satoshi Abe
  • Patent number: 6843810
    Abstract: An electric double layer capacitor is disclosed which is capable of preventing transmission of an electrolytic solution vaporized in a basic cell through current collectors and capable of improving a yield. A method for preparing the electric double layer capacitor is also disclosed.
    Type: Grant
    Filed: January 2, 2004
    Date of Patent: January 18, 2005
    Assignee: NEC Tokin Corporation
    Inventors: Yutaka Nakazawa, Ryuichi Kasahara, Koji Sakata
  • Publication number: 20040262093
    Abstract: An elevator system having multiple elevator cars efficiently assigns cars and communicates the car assignments to the potential passengers. A hallway intuitive user interface is readily adapted to installations having varying numbers of elevator cars with varying floor access by incorporating a graphical display that is rendered accordingly. Moreover, a combination of visual, textual and aural indications are given to the passenger that the destination entered is valid and assigned to a car. For those instances where a potential passenger fails to enter a destination correctly, the elevator system retains a traditional elevator control interface in the elevator car.
    Type: Application
    Filed: June 27, 2003
    Publication date: December 30, 2004
    Applicant: Fujitec America, Inc.
    Inventors: Steven Edson Forsythe, Koji Sakata, Joseph P. Rennekamp, John F. Miller
  • Patent number: 6797202
    Abstract: 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: Grant
    Filed: March 5, 2002
    Date of Patent: September 28, 2004
    Assignees: Bridgestone Corporaton, Mitsui Mining Company, Limited
    Inventors: Shigeki Endo, Howard See, Tasuku Saito, Koji Sakata, Kenji Fukuda, Youichiro Hara, Tatsuo Umeno
  • Publication number: 20040141280
    Abstract: An electric double layer capacitor is disclosed which is capable of preventing transmission of an electrolytic solution vaporized in a basic cell through current collectors and capable of improving a yield. A method for preparing the electric double layer capacitor is also disclosed.
    Type: Application
    Filed: January 2, 2004
    Publication date: July 22, 2004
    Applicant: NEC TOKIN CORPORATION
    Inventors: Yutaka Nakazawa, Ryuichi Kasahara, Koji Sakata
  • Patent number: 6751084
    Abstract: An electric double layer capacitor is disclosed which is capable of preventing transmission of an electrolytic solution vaporized in a basic cell through current collectors and capable of improving a yield. A method for preparing the electric double layer capacitor is also disclosed.
    Type: Grant
    Filed: October 17, 2002
    Date of Patent: June 15, 2004
    Assignee: NEC Tokin Corporation
    Inventors: Yutaka Nakazawa, Ryuichi Kasahara, Koji Sakata
  • Patent number: 6741450
    Abstract: An electric double-layer capacitor includes a cell structure formed by laminating basic cells in series one on another. Each of the basic cells includes a pair of collectors, a separator disposed between said collectors, gaskets disposed at peripheral edges of said pair of collectors and said separator to define a pair of closed spaces, and a pair of polarizable electrodes which are disposed in said closed spaces defined by said collectors, said separator and said gaskets, respectively and which contain an electrolytic solution. The basic cells are laminated one on another with a back of each of said collectors opposed to said polarizable electrode serving as a connection surface. The electric double-layer capacitor further includes a lead terminal/electrode plate assembly having electrode plates bonded to the collectors located at opposite ends of the cell structure through conductive bond layers.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: May 25, 2004
    Assignee: NEC Tokin Corporation
    Inventors: Yutaka Nakazawa, Ryuichi Kasahara, Koji Sakata
  • Publication number: 20040066604
    Abstract: An electric double layer capacitor, including at least one basic cell, an electrode plate, and an outer package which covers the basic cell and the electrode plate in a decompression state. The basic cell may be laminated in its thickness direction to form a layered cell and includes a separator, a pair of polarized electrodes disposed so as to sandwich the separator, a pair of collectors disposed so as to sandwich the polarized electrodes, and a gasket disposed between the pair of collectors so as to surround the pair of polarized electrodes. The electrode plate body is attached to each of the collectors located at the outermost side in a laminated direction of the layered cell. A sealing material having a higher gas barrier property than the collectors is disposed so as to seal an interface between the collectors and the electrode plate in the outer package.
    Type: Application
    Filed: July 7, 2003
    Publication date: April 8, 2004
    Applicant: NEC TOKIN CORPORATION
    Inventors: Koji Sakata, Kazuya Mimura, Yutaka Nakazawa, Satoshi Abe
  • Patent number: 6717795
    Abstract: An electric double-layer capacitor includes a cell structure constituted by laminating basic cells in series with their collectors serving as connections. Each of the basic cells includes a pair of collectors, a separator disposed between the collectors, and a pair of polarizable electrodes which are disposed between the collectors and the separator and in which an electrolytic solution is contained. The capacitor further includes lead terminal/electrode plate assemblies each having an electrode plate electrically connected to the collectors at opposite ends of the cell structure. Each of the collectors includes a matrix made of an elastomer having a hardness Hs in a range of about 55 (inclusive) to lower than about 85 at ambient temperature, and conductive particles dispersed in the matrix. Thus, in the electric double-layer capacitor, a lower ESR can be realized at in initial stage and even after the service for a long period.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: April 6, 2004
    Assignee: NEC Tokin Corporation
    Inventors: Yutaka Nakazawa, Ryuichi Kasahara, Koji Sakata
  • Patent number: 6671165
    Abstract: A separator, a pair of polarized electrodes, gaskets holding the separator and the polarized electrodes from their sides, and a pair of the collectors provided in contact with the outer surfaces of polarized electrodes and gaskets are provided in an electric double layer capacitor. The collectors are a lamination having a conductive film formed by coating a conductive resin solution containing a conductive material to at least one surface of copper foil.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: December 30, 2003
    Assignee: NEC Tokin Corporation
    Inventors: Yutaka Nakazawa, Koji Sakata, Kazuya Mimura, Takashi Yasuda
  • Patent number: 6657850
    Abstract: An electrical double layer capacitor includes a capacitor cell structure comprising: a separator; polarization electrodes; collectors; and a gasket, wherein at least a part of at least either one of the collectors and the gasket has a gas permeability coefficient of at least 4.0E-12[m3/(m2·S·Pa)].
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: December 2, 2003
    Assignee: NEC Tokin Corporation
    Inventors: Yutaka Nakazawa, Koji Sakata, Ryuuichi Kasahara
  • Patent number: 6636417
    Abstract: An electric double layer capacitor, including at least one basic cell, an electrode plate, and an outer package which covers the basic cell and the electrode plate in a decompression state. The basic cell may be laminated in its thickness direction to form a layered cell and includes a separator, a pair of polarized electrodes disposed so as to sandwich the separator, a pair of collectors disposed so as to sandwich the polarized electrodes, and a gasket disposed between the pair of collectors so as to surround the pair of polarized electrodes. The electrode plate body is attached to each of the collectors located at the outermost side in a laminated direction of the layered cell. A sealing material having a higher gas barrier property than the collectors is disposed so as to seal an interface between the collectors and the electrode plate in the outer package.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: October 21, 2003
    Assignee: NEC Tokin Corporation
    Inventors: Koji Sakata, Kazuya Mimura, Yutaka Nakazawa, Satoshi Abe
  • Patent number: 6625007
    Abstract: A component cell of an electric double layer capacitor is fabricated by forming first and second half portions of the cell. In each of the half portions a polarized electrode impregnated with electrolyte is pasted to a collector electrode so that a stepped portion is formed on the periphery of the collector electrode. A gasket is attached to the stepped portion of each half portion, and a center gasket is attached to the periphery of a separator which is placed between the first and second half portions. Pressure is then applied to the first and second half portions of the cell in directions towards each other at an elevated temperature so that all gaskets are thermally joined together. A plurality of such component cells are stacked in a layered structure and sealed in a package.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: September 23, 2003
    Assignee: NEC Tokin Corporation
    Inventors: Koji Sakata, Yutaka Nakazawa, Ryuichi Kasahara
  • Publication number: 20030147201
    Abstract: An electric double-layer capacitor includes a cell structure formed by laminating basic cells in series one on another. Each of the basic cells includes a pair of collectors, a separator disposed between said collectors, gaskets disposed at peripheral edges of said pair of collectors and said separator to define a pair of closed spaces, and a pair of polarizable electrodes which are disposed in said closed spaces defined by said collectors, said separator and said gaskets, respectively and which contain an electrolytic solution. The basic cells are laminated one on another with a back of each of said collectors opposed to said polarizable electrode serving as a connection surface. The electric double-layer capacitor further includes a lead terminal/electrode plate assembly having electrode plates bonded to the collectors located at opposite ends of the cell structure through conductive bond layers.
    Type: Application
    Filed: December 17, 2002
    Publication date: August 7, 2003
    Applicant: NEC TOKIN CORPORATION
    Inventors: Yutaka Nakazawa, Ryuichi Kasahara, Koji Sakata
  • Publication number: 20030095372
    Abstract: An electric double-layer capacitor includes a cell structure constituted by laminating basic cells in series with their collectors serving as connections. Each of the basic cells includes a pair of collectors, a separator disposed between the collectors, and a pair of polarizable electrodes which are disposed between the collectors and the separator and in which an electrolytic solution is contained. The capacitor further includes lead terminal/electrode plate assemblies each having an electrode plate electrically connected to the collectors at opposite ends of the cell structure. Each of the collectors includes a matrix made of an elastomer having a hardness Hs in a range of about 55 (inclusive) to lower than about 85 at ambient temperature, and conductive particles dispersed in the matrix. Thus, in the electric double-layer capacitor, a lower ESR can be realized at in initial stage and even after the service for a long period.
    Type: Application
    Filed: October 31, 2002
    Publication date: May 22, 2003
    Applicant: NEC TOKIN CORPORATION
    Inventors: Yutaka Nakazawa, Ryuichi Kasahara, Koji Sakata
  • Publication number: 20030081372
    Abstract: An electric double layer capacitor is disclosed which is capable of preventing transmission of an electrolytic solution vaporized in a basic cell through current collectors and capable of improving a yield. A method for preparing the electric double layer capacitor is also disclosed.
    Type: Application
    Filed: October 17, 2002
    Publication date: May 1, 2003
    Applicant: NEC TOKIN CORPORATION
    Inventors: Yutaka Nakazawa, Ryuichi Kasahara, Koji Sakata
  • Publication number: 20020191369
    Abstract: An electrical double layer capacitor includes a capacitor cell structure comprising: a separator; polarization electrodes; collectors; and a gasket, wherein at least a part of at least either one of the collectors and the gasket has a gas permeability coefficient of at least 4.0E-12[m3/(m2·S·Pa)].
    Type: Application
    Filed: March 19, 2002
    Publication date: December 19, 2002
    Applicant: NEC CORPORATION
    Inventors: Yutaka Nakazawa, Koji Sakata, Ryuuichi Kasahara
  • Publication number: 20020154467
    Abstract: An electric double layer capacitor comprises: a separator; a pair of electrodes separated by the separator, and the electrodes including activated carbon particles and a binder binding the activated carbon particles; and a pair of collectors separated by the pair of electrodes, wherein a density of the electrodes is in the range of 1.4 g/cm3 to 1.8 g/cm3.
    Type: Application
    Filed: February 6, 2002
    Publication date: October 24, 2002
    Applicant: NEC CORPORATION
    Inventors: Yutaka Nakazawa, Koji Sakata, Ryuuichi Kasahara
  • Publication number: 20020131232
    Abstract: A component cell of an electric double layer capacitor is fabricated by forming first and second half portions of the cell. In each of the half portions a polarized electrode impregnated with electrolyte is pasted to a collector electrode so that a stepped portion is formed on the periphery of the collector electrode. A gasket is attached to the stepped portion of each half portion, and a center gasket is attached to the periphery of a separator which is placed between the first and second half portions. Pressure is then applied to the first and second half portions of the cell in directions towards each other at an elevated temperature so that all gaskets are thermally joined together. A plurality of such component cells are stacked in a layered structure and sealed in a package.
    Type: Application
    Filed: March 14, 2002
    Publication date: September 19, 2002
    Applicant: NEC CORPORATION
    Inventors: Koji Sakata, Yutaka Nakazawa, Ryuichi Kasahara