Patents by Inventor Olof Hjortstam

Olof Hjortstam 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).

  • Electric Insulation Material, An Electric Device Comprising The Insulation Material And A Transformer
    Publication number: 20110030987
    Abstract: An electric insulation material for an electric device includes one or several electrical conductors and an electric insulation material arranged around the conductor or between the conductors, which insulation material is impregnated with a dielectric insulation liquid. The electric insulation material includes a main layer that is provided with a surface layer that has a dielectric constant that is lower than the dielectric constant of the main layer.
    Type: Application
    Filed: June 28, 2010
    Publication date: February 10, 2011
    Inventors: Olof Hjortstam, Rongsheng Liu, Albert Jaksts, Gunilla Eken, Leif A. Pettersson
  • Induction Regulator for Power Flow Control in an AC Transmission Network
    Publication number: 20100213906
    Abstract: An induction regulator for controlling the voltage amplitude and/or phase angle of a polyphase electric transmission network connected between the primary side and the secondary side of the transmission network. The rotor is fixed in relation to the stator and the volume between stator and rotor includes a magnetic volume with a region including a controllable magnetic flux region of solid material that has a relative permeability that is controllable by changing its temperature.
    Type: Application
    Filed: September 27, 2006
    Publication date: August 26, 2010
    Inventors: Mikael Dahlgren, Stefan Johansson, Olof Hjortstam, Gunnar Russberg
  • High-voltage bushing
    Publication number: 20080179077
    Abstract: The bushing has a conductor and a core surrounding the conductor. The core comprises a sheet-like spacer, wherein the spacer contains filler particles. The bushing can be a resin-impregnated graded bushing impregnated with an electrically insulating matrix material. The spacer may comprise paper, in particular creped paper. The filler particles can be electrically insulating or semiconductive particles. An increased thermal conductivity of the core can be achieved.
    Type: Application
    Filed: December 6, 2007
    Publication date: July 31, 2008
    Applicant: ABB Research Ltd
    Inventors: Andrej Krivda, Vincent Tilliette, Jens Rocks, Henrik Hillborg, Olof Hjortstam, Leopold Ritzer, Patrick Meier
  • Power cable
    Publication number: 20040020681
    Abstract: A power cable containing at least one conductor comprising individual nanostructures that are substantially homogeneously dispersed in a matrix.
    Type: Application
    Filed: January 24, 2003
    Publication date: February 5, 2004
    Inventors: Olof Hjortstam, Peter Isberg, Svante Soderholm, Hakan Korske
  • Induction winding
    Publication number: 20020186113
    Abstract: An induction winding containing at least one turn of current-carrying means that include at least one electric conductor comprising nanostructures
    Type: Application
    Filed: February 5, 2002
    Publication date: December 12, 2002
    Inventors: Olof Hjortstam, Peter Isberg, Svante Soderholm
  • Conducting material
    Publication number: 20020183207
    Abstract: Conducting material for an electric conductor comprising nanostructures (31) and a charge-transfer agent that shifts the nanostructures' fermi level so that said nanostructures attain an enhanced conductivity.
    Type: Application
    Filed: February 5, 2002
    Publication date: December 5, 2002
    Inventors: Olof Hjortstam, Peter Isberg