Patents by Inventor Dennis Franklin Rutherford

Dennis Franklin Rutherford 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).

  • Mine roof support
    Patent number: 4114387
    Abstract: A mine roof support having a roof-engageable means which includes a roof-engageable pad connected to the remainder of the means by a lever or levers. Ram means is provided which is operative in a direction at right-angles to, or substantially at right-angles to, the fore-and-aft direction of the support to move the lever or levers to adjust the height of the pad with respect to the remainder of the roof-engageable means.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: September 19, 1978
    Assignee: Dowty Mining Equipment Limited
    Inventor: Dennis Franklin Rutherford
  • Mine roof support
    Patent number: 3952525
    Abstract: A mine roof support arranged for propulsion over a mine floor by means of an advancing jack wherein the advancing jack is arranged to exert an inclined force on the support of which one component is parallel to the floor for propelling the support along the floor and the other component lifts or tends to lift the support from the floor thereby reducing frictional engagement with the floor.
    Type: Grant
    Filed: October 11, 1974
    Date of Patent: April 27, 1976
    Assignee: Dowty Mining Equipment Limited
    Inventors: John Hirst Walker, Dennis Franklin Rutherford, James Anthony Sutton