Patents by Inventor Rolf Soderholm

Rolf Soderholm 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).

  • Arrangement in transformers
    Patent number: 4600877
    Abstract: In a transformer having a primary winding which is connectable to an a.c. voltage source via switch means which opens and closes at a controllable frequency, there is connected in parallel with the primary or secondary winding of the transformer a circuit which for at least a part of the time during which the switch means opens maintains magnetization of the transformer in a direction opposite to the direction of the magnetization caused by the subsequent closing of the switch means.
    Type: Grant
    Filed: September 19, 1984
    Date of Patent: July 15, 1986
    Assignee: Kraftelektronik AB
    Inventor: Rolf Soderholm