Patents by Inventor Itaru Minakawa

Itaru Minakawa 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).

  • Power cable
    Patent number: 9129722
    Abstract: A power cable includes a steel pipe coupled to a reference potential node, three transmission cables within the steel pipe and respectively including a conductor to transmit three-phase alternating current power, and a return cable within the steel pipe and coupled to the reference potential node. Each of the three transmission cables includes a first insulating layer covering the conductor, a metal layer covering the first insulating layer, and a second insulating layer covering the metal layer. The three transmission cables are twisted around a periphery of the return cable along a longitudinal direction of the return cable, and the metal layer is coupled to the reference potential node.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: September 8, 2015
    Assignee: J—Power Systems Corporation
    Inventors: Satoshi Ona, Shoji Mashio, Kinya Kumagawa, Itaru Minakawa
  • POWER CABLE
    Publication number: 20150206628
    Abstract: A power cable includes a steel pipe coupled to a reference potential node, three transmission cables within the steel pipe and respectively including a conductor to transmit three-phase alternating current power, and a return cable within the steel pipe and coupled to the reference potential node. Each of the three transmission cables includes a first insulating layer covering the conductor, a metal layer covering the first insulating layer, and a second insulating layer covering the metal layer. The three transmission cables are twisted around a periphery of the return cable along a longitudinal direction of the return cable, and the metal layer is coupled to the reference potential node.
    Type: Application
    Filed: June 18, 2014
    Publication date: July 23, 2015
    Inventors: Satoshi ONA, Shoji Mashio, Kinya Kumagawa, Itaru Minakawa
  • POWER CABLE
    Publication number: 20150206629
    Abstract: A power cable includes a steel pipe coupled to a reference potential node, three transmission cables within the steel pipe and respectively including a conductor to transmit three-phase alternating current power, and a return cable within the steel pipe and coupled to the reference potential node. Each of the three transmission cables includes a first insulating layer covering the conductor, a metal layer covering the first insulating layer, and a second insulating layer covering the metal layer. The three transmission cables are twisted around a periphery of the return cable along a longitudinal direction of the return cable, and the metal layer is coupled to the reference potential node.
    Type: Application
    Filed: March 18, 2015
    Publication date: July 23, 2015
    Inventors: Satoshi ONA, Shoji MASHIO, Kinya KUMAGAWA, Itaru MINAKAWA