Patents by Inventor Luis de la Pena Porth

Luis de la Pena Porth 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).

  • Patent number: 3954453
    Abstract: Metallic copper is recovered from an ammoniacal copper sulfate solution by treating such solution with sulfur dioxide to form a precipitate of copper ammonium sulfite. The crystals are suspended in an acidic solution containing initially from 20 to 75 grams per liter of sulfuric acid, which preferably contains a substantial concentration (up to saturation) of ammonium sulfate, said solution containing from 40% to 70% by weight of such crystals, and the resulting suspension is heated at 140.degree.C. to 170.degree.C. and at 150 to 220 psi. until substantially all the copper ammonium sulfite has been converted to metallic copper. The metallic copper thereafter is separated from the residual solution.
    Type: Grant
    Filed: July 24, 1974
    Date of Patent: May 4, 1976
    Inventors: Luis de la Pena Porth, Luis Espinosa DE Leon, Raymundo Delgado, Tomas Perez