Patents by Inventor Mercedes Teresita Oropeza Guzmán

Mercedes Teresita Oropeza Guzmán 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).

  • PROCESS FOR GOLD AND SILVER LEACHING WITH THIOUREA SOLUTIONS
    Publication number: 20130140186
    Abstract: A solution composition that permits the use of thiourea is provided. The process is to form a solution that improves, on one hand, the velocity of gold and silver extraction, from minerals and other materials that contain them, improving the stability of the thiourea in the leaching solution and, on the other, the direct electrorecovery of the metals from the solution. The leaching solution, beforehand or simultaneously, has been subjected to a controlled electro-oxidation to produce formamidine disulfide (FADS) which acts as an oxidizing agent for the mineral phases that contain the gold and silver. In a preferred mode, the FADS is present as 10 to 30% of the total thiourea contained in the solution and the electrodeposition of the metals is performed in the same cell (cathodic compartment) in which the FADS is formed (anodic compartment).
    Type: Application
    Filed: November 23, 2012
    Publication date: June 6, 2013
    Inventors: Gretchen Terri Lapidus Lavine, Maria Concepcion Lopez Escutia, Mercedes Teresita Oropeza Guzman, Ignacio Gonzalez Martinez, Fernando Rodriguez Hernandez, Maria Elena Poisot Diaz, Ita Giron Bautista
  • Process for gold and silver leaching with thiourea solutions
    Publication number: 20110290657
    Abstract: A solution composition that permits the use of thiourea is provided. The process is to form a solution that improves, on one hand, the velocity of gold and silver extraction, from minerals and other materials that contain them, improving the stability of the thiourea in the leaching solution and, on the other, the direct electrorecovery of the metals from the solution. The leaching solution, beforehand or simultaneously, has been subjected to a controlled electro-oxidation to produce formamidine disulfide (FADS) which acts as an oxidizing agent for the mineral phases that contain the gold and silver. In a preferred mode, the FADS is present as 10 to 30% of the total thiourea contained in the solution and the electrodeposition of the metals is performed in the same cell (cathodic compartment) in which the FADS is formed (anodic compartment).
    Type: Application
    Filed: December 6, 2010
    Publication date: December 1, 2011
    Inventors: Gretchen Terri Lapidus Lavine, Maria Concepción López Escutia, Mercedes Teresita Oropeza Guzmán, Ignacio González Martínez, Fernando Rodríguez Hernández, Maria Elena Poisot Diáz, Ita Girón Bautista