Patents by Inventor Paul D. McQuade

Paul D. McQuade 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).

  • Patent number: 4445723
    Abstract: A circular mining process for deep mining in which a substantially circular tunnel is cut in the mountain against the advancing continuous face of the mine. As coal is cut from the face and hauled outside, additional strata from below the coal, which includes rock and stone are piled and packed to the ceiling against the opposite wall to serve as a roof support. Vehicles with special implements move in one direction only and cut the advance wall, gather the mined ore, and haul the mined ore, as well as rock and stone to a clearing out of the mine on the side of the mountain, and adjacent to the portals of the circular passageway.
    Type: Grant
    Filed: July 26, 1982
    Date of Patent: May 1, 1984
    Inventor: Paul D. McQuade