Patents by Inventor Brian T. Field

Brian T. Field 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).

  • Treatment of gold bearing ore
    Patent number: 5380504
    Abstract: The present invention relates to a process for roasting gold containing ore in which a flash furnace means is provided, in particular a gas suspension furnace for roasting the ore. Hot gas and the gold containing ore to be roasted are supplied to the furnace means, wherein the hot gas roasts the ore within the furnace means at temperatures between about 500.degree. C. and 700.degree. C. while the ore is suspended in the hot gas, after which the roasted ore is discharged from the furnace means along with the hot gas. In the apparatus of the present the ore to be calcined may optionally be preheated, prior to the ore entering the furnace means, by suspending the fresh ore in hot gas.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: January 10, 1995
    Assignee: Fuller Company
    Inventors: William E. Lindquist, Brian T. Field, Bernard T. McCormick