Patents by Inventor Tommy Lejonberg

Tommy Lejonberg 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).

  • Plant for feeding alternating voltage with reduced losses
    Patent number: 6339263
    Abstract: A plant for feeding alternative voltage between places located remotely through a long first line includes a feeding arrangement for feeding electric power to the first line. This arrangement has a second line conducting direct voltage and adapted to extend along the first line, and inverters arranged at locations along the extension of the lines. The inverters are connected between the direct voltage line and the alternating voltage line for converting direct voltage into alternating voltage which is fed to the first line.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: January 15, 2002
    Assignee: Balfour Beatty plc
    Inventor: Tommy Lejonberg
  • Converter device for connection between a single-phase side on a single or multi-phase side
    Patent number: 6052293
    Abstract: A device for converting current and voltage between a first single-phase side and a second single- or multi-phase side is provided. At least two converter modules are connected between these sides. Each converter module has two converters interacting with one of the sides and an intermediate link interconnecting them. The converter modules are connected in series on the first side.
    Type: Grant
    Filed: June 12, 1998
    Date of Patent: April 18, 2000
    Assignee: DaimlerChrysler AG
    Inventors: Sven Ivner, Tommy Lejonberg