Patents by Inventor Robert D. Jeffress

Robert D. Jeffress 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).

  • Two-stage ferrosilicon smelting process
    Patent number: 4898712
    Abstract: The present invention relates to a process for the production of ferrosilicon in a closed two-stage reduction furnace. In the present invention, carbon monoxide released as a result of the smelting process, in the first stage of the furnace, is used to prereduce higher oxides of iron, for example Fe.sub.2 O.sub.3 and Fe.sub.3 O.sub.4, contained in a second stage of a furnace, to iron monoxide (FeO). The iron monoxide is then used as a feed material to the first stage of the furnace. The use of a closed furnace and a pre-reduction process results in substantial energy savings in the production of ferrosilicon alloy.
    Type: Grant
    Filed: March 20, 1989
    Date of Patent: February 6, 1990
    Assignee: Dow Corning Corporation
    Inventors: Vishu D. Dosaj, James B. May, Robert D. Jeffress