Patents by Inventor Dian E. Roberts

Dian E. Roberts 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).

  • Recovery of platinum group metals and gold by synergistic reaction between allylalkyl thionocarbamates and dithiophosphates
    Patent number: 5232581
    Abstract: Collector compositions for use in froth flotation processes for the beneficiation of gold, silver and platinum group values from base metal ores are disclosed. The collector compositions comprise at least one dithiophosphate compound of the formula: ##STR1## and at least one allylalkylthionocarbamate of the formula: ##STR2## wherein each R is, individually, a C.sub.2 -C.sub.8 alkyl radical. The use of the collector combination provides excellent selective recovery of the gold, silver and platinum group metal values into froth flotation processes conducted under neutral to alkaline conditions.
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: August 3, 1993
    Assignee: American Cyanamid Company
    Inventors: Dian E. Roberts, Robert J. Jackson, Alexander S. Lambert