Patents by Inventor Birgitta Källstrand

Birgitta Källstrand 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: 10679772
    Abstract: An electric power cable and a process for the production of the cable including a metal conductor and an electric insulation system surrounding the conductor coaxially and radially outwards of the conductor having improved electric properties. The insulation system includes an inner semi-conducting layer surrounded radially outwards by an insulation layer and wherein the insulation layer is surrounded radially outwards by an outer semi-conducting layer. The electric power cable further includes an inner water blocking material arranged in the conductor and/or to surround the conductor radially outwards and an outer water blocking material arranged radially outwards from the insulation system. An inner barrier layer is arranged as a diffusion hindering layer between the inner water blocking material and the insulation system and an outer barrier layer is arranged as a diffusion hindering layer between the insulation system and the outer water blocking material.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: June 9, 2020
    Assignee: NKT HV Cables AB
    Inventors: Hossein Ghorbani, Peter Sunnegårdh, Birgitta Källstrand, Carl-Olof Olsson, Ulf Nilsson, Per-Ola Hagstrand, Villgot Englund, Emy Silfverberg, Niklas Thorn
  • Publication number: 20180190409
    Abstract: An electric power cable and a process for the production of the cable including a metal conductor and an electric insulation system surrounding the conductor coaxially and radially outwards of the conductor having improved electric properties. The insulation system includes an inner semi-conducting layer surrounded radially outwards by an insulation layer and wherein the insulation layer is surrounded radially outwards by an outer semi-conducting layer. The electric power cable further includes an inner water blocking material arranged in the conductor and/or to surround the conductor radially outwards and an outer water blocking material arranged radially outwards from the insulation system. An inner barrier layer is arranged as a diffusion hindering layer between the inner water blocking material and the insulation system and an outer barrier layer is arranged as a diffusion hindering layer between the insulation system and the outer water blocking material.
    Type: Application
    Filed: June 23, 2015
    Publication date: July 5, 2018
    Inventors: Hossein Ghorbani, Peter Sunnegårdh, Birgitta Källstrand, Carl-Olof Olsson, Ulf Nilsson, Per-Ola Hagstrand, Villgot Englund, Emy Silfverberg, Niklas Thorn
  • Patent number: 8067694
    Abstract: An extruded high voltage cable including a conductor with at least three concentric layers of helically wound metal wires, an extruded inner conducting layer surrounding the conductor, and an extruded electrical insulation arranged outside the inner conducting layer. The two outermost layers of the conductor have the same lay direction.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: November 29, 2011
    Assignee: Abb Research Ltd.
    Inventors: Poorvi Patel, Birgitta Källstrand, Michal Ciach, Elisabeth Strandemo, Ulf Öberg, Tommy Johansson, Carl-Olof Olsson
  • Publication number: 20100078195
    Abstract: An extruded high voltage cable including a conductor with at least three concentric layers of helically wound metal wires, an extruded inner conducting layer surrounding the conductor, and an extruded electrical insulation arranged outside the inner conducting layer. The two outermost layers of the conductor have the same lay direction.
    Type: Application
    Filed: October 18, 2007
    Publication date: April 1, 2010
    Inventors: Poorvi Patel, Birgitta Källstrand, Michal Ciach, Elisabeth Strandemo, Ulf Öberg, Tommy Johansson, Carl-Olof Olsson