Patents by Inventor Frank Kolkmann

Frank Kolkmann 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).

  • Building elevator
    Patent number: 6910553
    Abstract: A building elevator with an elevator mast and an elevator car with at least one electric drive motor for the elevator car for moving the same along the elevator mast. A novel overload-prevention device for the building elevator has two drive motors with the device intended for adding the forces occurring in the abutments of the drive motors and connected to a limit switch.
    Type: Grant
    Filed: August 7, 2000
    Date of Patent: June 28, 2005
    Assignee: Herman Steinweg GmbH Co. & KG Baumaschinenfabrik
    Inventors: Hartmut Löbbe, Frank Kolkmann