Patents by Inventor Louis F. Keller

Louis F. Keller 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).

  • Truck mounted pavement marking applicator
    Patent number: 5059061
    Abstract: Method and apparatus are disclosed for automatically applying pavement marking tape to roadway surfaces using a self-propelled vehicle. Tapes can be applied in continuous stripes or intermittent stripes of variable spacing or length while the vehicle is in motion. Methods are also disclosed for changing rolls of tapes while the vehicle is in motion, and thereby reducing stopping times for splicing. The tape application mechanism can be enclosed within the vehicle so that the operator is protected from traffic hazards.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: October 22, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Heinrich F. Stenemann, Louis F. Keller
  • Method and apparatus for applying a reflective sleeve to a traffic cone
    Patent number: 5047107
    Abstract: A method and apparatus for applying one or more reflective sleeves to a traffic cone. The sleeve is supported on a platform and the traffic cone is positioned in contact with one end edge of the sleeve and rotated to wind the sleeve onto the traffic cone.
    Type: Grant
    Filed: June 27, 1989
    Date of Patent: September 10, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Louis F. Keller, James P. McAuley, Heinrich F. Stenemann