Patents by Inventor Dennis E. Petticrew

Dennis E. Petticrew 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).

  • Beneficiation process for oil shale
    Patent number: 4257878
    Abstract: A beneficiation process for increasing the oil content of clay-bearing oil shale ore wherein the oil shale ore is subjected to an aqueous medium, agitated to disintegrate at least a portion of the clay, and the disintegrated clay is separated from the remaining oil shale to yield an oil shale having a greater amount of recoverable hydrocarbon values per ton than the unprocessed oil shale ore.
    Type: Grant
    Filed: April 12, 1979
    Date of Patent: March 24, 1981
    Assignee: The Superior Oil Company
    Inventors: J. William Fishback, Dennis E. Petticrew