Patents by Inventor Colwyn S. van der Linde

Colwyn S. van der Linde 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).

  • Extraction methods from refractory ores
    Patent number: 11401578
    Abstract: A method for extracting and separating Gold, Silver, Copper, Zinc and/or Lead from an Arsenic-containing ore, concentrate or tailings characterized in that the extraction is carried by roasting in the presence of a calcium-containing material and at least one of an alkali metal halide and alkaline metal halide. In the method, Arsenic remains immobilized in the extraction residue.
    Type: Grant
    Filed: November 10, 2017
    Date of Patent: August 2, 2022
    Assignee: TCM RESEARCH LTD.
    Inventors: Dmitri S. Terekhov, Colwyn S. van der Linde
  • EXTRACTION METHODS FROM REFRACTORY ORES
    Publication number: 20200056260
    Abstract: A method for extracting and separating Gold, Silver, Copper, Zinc and/or Lead from an Arsenic-containing ore, concentrate or tailings characterized in that the extraction is carried by roasting in the presence of a calcium-containing material and at least one of an alkali metal halide and alkaline metal halide. In the method, Arsenic remains immobilized in the extraction residue.
    Type: Application
    Filed: November 10, 2017
    Publication date: February 20, 2020
    Inventors: Dmitri S. Terekhov, Colwyn S. van der Linde