Patents by Inventor Eduardo Diaz Nogueira

Eduardo Diaz Nogueira 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 non-ferrous metals production from complex sulphide ores containing copper, lead, zinc, silver and/or gold
    Patent number: 4266972
    Abstract: Metal sulphide ore is leached by water under a low pressure and oxidizing atmosphere to dissolve zinc and copper, hydrolyze iron to hematite, and leave lead and precious metals as insoluble sulphates. The residue is leached by sodium chloride and calcium chloride to dissolve lead and the precious metals.
    Type: Grant
    Filed: December 14, 1979
    Date of Patent: May 12, 1981
    Inventors: Angel L. Redondo-Abad, Eduardo Diaz-Nogueira, Martin Gerez-Pascual, Jose M. Regife-Vega
  • Process for the elimination of accumulated iron in organic phases of fluid-fluid extraction that contain di-2-ethyl-hexyl phosphoric acid
    Patent number: 4235713
    Abstract: The present invention refers to a process for the elimination of accumulated iron in organic phases of fluid-fluid extraction that contain di-2-ethyl-hexyl phosphoric acid, by means of its treatment by direct contact with an acid aqueous solution of chloride ions, which is subsequently subjected to the action of an anionic ion exchanger that extracts the iron and leaves it iron-free for its re-utilization, and the regeneration of the anionic exchanger by means of treating it with water, purifying the iron from the system in the form of a relatively concentrated ferric chloride aqueous solution.
    Type: Grant
    Filed: June 6, 1978
    Date of Patent: November 25, 1980
    Inventors: Eduardo Diaz Nogueira, Angel L. Redondo Abad, Jose M. Regife Vega