Patents by Inventor Peter D. Kondos

Peter D. Kondos 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 reduced alkali consumption in the recovery of silver
    Patent number: 8252254
    Abstract: The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by hot curing of the autoclave discharge slurry followed by decomposition of argentojarosite using strong acid consumers.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: August 28, 2012
    Assignee: Barrick Gold Corporation
    Inventors: Yeonuk Choi, Peter D. Kondos, Jacques McMullen
  • Multiple stage precipitation of heavy metals from acidic aqueous solution
    Patent number: 5672280
    Abstract: For the removal of heavy metal contaminants from industrial waste water, a method is proposed for preparing a dense precipitate having superior handling and disposal properties. The method comprises incremental adjustment of the pH to maintain a low saturation ratio and recycling of slurry to provide seed crystals for secondary nucleation.
    Type: Grant
    Filed: May 26, 1995
    Date of Patent: September 30, 1997
    Assignees: Her Majesty the Queen in right of Canada, as represented by the Minister of Natural Resources, McGill University
    Inventors: George P. Demopoulos, Janice M. Zinck, Peter D. Kondos
  • Use of microwave radiation to eliminate foam in ore leaching
    Patent number: 5091160
    Abstract: A method of eliminating the foam above a slurry of a corrosive liquid and solid matter where the foam is caused by a gas evolved by the reaction between the heated corrosive liquid and the solid matter comprising providing the heating energy by microwaves. This method has been found to be particularly useful in the sulphuric acid leaching of an ore concentrate in the production of beryllium hydroxide.
    Type: Grant
    Filed: November 5, 1990
    Date of Patent: February 25, 1992
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of Energy
    Inventors: Peter D. Kondos, Kazi E. Haque, John C. MacDonald, Wesley F. Griffith, Daniel Laforest, Joe Iuliano