Patents by Inventor Robert K. Papps

Robert K. Papps 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).

  • Loading and unloading of vehicles
    Patent number: 4261682
    Abstract: Apparatus for loading and unloading of vehicles such as a semi-trailer in which two pairs of continuous chains riding on their side plates extend substantially the length of the vehicle, the pairs being separated by a vertical wall, each pair of chains having a sprocket equipped drive shaft at the rear end of the vehicle with a hydraulic motor for driving the shaft and hydrauically operated struts connected to the bearing housings of the shaft for varying the chain tension.
    Type: Grant
    Filed: August 21, 1978
    Date of Patent: April 14, 1981
    Assignee: Metal Box Limited
    Inventors: Robert K. Papps, Frank E. Webber