Patents by Inventor Robert J. Kuczynski

Robert J. Kuczynski 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).

  • Cyanide leaching method for recovering platinum group metals from a catalytic converter catalyst
    Patent number: 5160711
    Abstract: A method for recovering platinum group metals from a catalyst material comprises leaching the material with a cyanide solution at a temperature greater than about 100.degree. C. to form soluble platinum group metal-cyanide complexes in solution. Solids are removed from the resulting pregnant leach solution, and the pregnant leach solution is then heated to a temperature sufficient to decompose the platinum group metal-cyanide complexes and precipitate the platinum group metals.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: November 3, 1992
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Gary B. Atkinson, Robert J. Kuczynski, Dennis P. Desmond