Patents by Inventor Gordon E. Agar

Gordon E. Agar 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).

  • Gold and silver recovery method
    Patent number: 5074909
    Abstract: A process for recovering gold and silver from refractory ores containing precious metals locked in sulfide and arsenide minerals including roasting a concentrate of said sulfide and arsenide minerals with lime at a temperature of about 600.degree. C. Thereafter the resultant calcine is ground, leached with cyanide and precious metals are recovered from the cyanide solution.
    Type: Grant
    Filed: November 15, 1990
    Date of Patent: December 24, 1991
    Assignee: Inco Limited
    Inventor: Gordon E. Agar
  • Scheelite flotation process
    Patent number: 4488959
    Abstract: A process for separating scheelite from gange wherein the ore is ground with 0.4 to 10 grams of alkali metal carbonate per kg. of ore, forming a pulp and removing sulfide minerals from pulp liquor. Carrying out froth floatation in the presence of paraffin oil, 0.1-0.4 gram of fatty acid per kg. of ore and 3.2-5.5 grams of sodium silicate per kg. of ore wherein the weight ratio of paraffin oil to fatty acid is 0.5:1 to 2.8:1.
    Type: Grant
    Filed: September 13, 1982
    Date of Patent: December 18, 1984
    Inventor: Gordon E. Agar