Patents by Inventor Sören Petersson

Sören Petersson 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).

  • Controllable inductor
    Patent number: 6429765
    Abstract: A controllable inductor comprises at least a tubular core, a main winding surrounding the core and a control winding passing substantially axially through the core. A yoke of a material having a high magnetic permeability is arranged to extend outside the core and the main winding and together with the core form a closed loop having at the most small air gaps for a main magnetic flux generated in the core by a current in the main winding and extending substantially axially to the core. The control winding comprises first plates of a material having a good electric conductivity extending substantially axially through the core.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: August 6, 2002
    Assignee: ABB AB
    Inventors: Stefan Valdemarsson, Lars Liljestrand, Erik Forsberg, Sören Petersson