Patents by Inventor Mamdouh M. El Tawil

Mamdouh M. El Tawil 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).

  • Reduction roasting of metal ores
    Patent number: 4985216
    Abstract: A process is provided for the reduction roasting of ores using a C.sub.2 to C.sub.8 hydrocarbon. The process is particularly applicable to manganese dioxide containing ores and provides enhanced reduction of the manganese to lower oxidation states at low operating temperatures for manganese dioxide ores and provides increased silver recoveries from refractory manganese-silver ores.
    Type: Grant
    Filed: July 20, 1988
    Date of Patent: January 15, 1991
    Assignee: ASARCO Incorporated
    Inventors: Mamdouh M. El Tawil, Adrian E. Albrethsen