Patents by Inventor Paul B. Archibald

Paul B. Archibald 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).

  • Explosive fluid transmitted shock method for mining deeply buried coal
    Patent number: 3964792
    Abstract: A method for recovering coal from deeply buried deposits comprising drilling a hole down into a coal seam, filling the hole with water, and periodically detonating an explosive charge at the bottom of the water-filled hole. The water transmits the explosive shock wave to the face of the coal seam, thereby fracturing and dislodging the coal. The resulting suspension of loose coal in water is then pumped to the surface where the coal is recovered and the water is recycled to the mining operation.
    Type: Grant
    Filed: January 28, 1975
    Date of Patent: June 22, 1976
    Assignee: The United States of America as represented by the United States Energy Research and Development Administration
    Inventor: Paul B. Archibald