Patents by Inventor Karl E. Hammar

Karl E. Hammar 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).

  • On-load tap changer switch assembly
    Patent number: 4207445
    Abstract: In an on-load tap changer comprising a step selector operated by two shafts which are rotatable with respect to each other, a damping switch for temporarily switching in a damping resistor during a plus/minus or a coarse/fine switching operation is operated by a cam member fixedly mounted on one of the two shafts.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: June 10, 1980
    Assignee: ASEA Aktiebolag
    Inventor: Karl E. Hammar