Patents by Inventor Ralph Peter Hackl

Ralph Peter Hackl 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).

  • Method for thiosulfate leaching of precious metal-containing materials
    Patent number: 7704298
    Abstract: Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: April 27, 2010
    Assignee: Placer Dome Technical Services Limited
    Inventors: Jinxing Ji, Christopher Andrew Fleming, Paul George West-Sells, Ralph Peter Hackl
  • Method for thiosulfate leaching of precious metal-containing materials
    Patent number: 7559974
    Abstract: Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.
    Type: Grant
    Filed: October 29, 2007
    Date of Patent: July 14, 2009
    Assignee: Placer Dome Technical Services Ltd.
    Inventors: Jinxing Ji, Christopher Andrew Fleming, Paul George West-Sells, Ralph Peter Hackl
  • Method for thiosulfate leaching of precious metal-containing materials
    Patent number: 7544232
    Abstract: Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ heap leaching or lixiviants that include one or more blinding agents.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: June 9, 2009
    Assignee: Placer Dome Technical Services Ltd.
    Inventors: Ralph Peter Hackl, Jinxing Ji, Paul George West-Sells
  • Method for thiosulfate leaching of precious metal-containing materials
    Patent number: 7066983
    Abstract: Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: June 27, 2006
    Assignee: Placer Dome Technical Services Limited
    Inventors: Jinxing Ji, Christopher Andrew Fleming, Paul George West-Sells, Ralph Peter Hackl
  • Method for thiosulfate leaching of precious metal-containing materials
    Publication number: 20040206207
    Abstract: Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.
    Type: Application
    Filed: April 30, 2004
    Publication date: October 21, 2004
    Applicant: Placer Dome Technical Services Limited
    Inventors: Jinxing Ji, Christopher Andrew Fleming, Paul George West-Sells, Ralph Peter Hackl
  • Method for thiosulfate leaching of precious metal-containing materials
    Publication number: 20040115108
    Abstract: Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ heap leaching or lixiviants that include one or more blinding agents.
    Type: Application
    Filed: November 13, 2003
    Publication date: June 17, 2004
    Inventors: Ralph Peter Hackl, Jinxing Ji, Paul George West-Sells
  • Method for thiosulfate leaching of precious metal-containing materials
    Publication number: 20040035252
    Abstract: Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.
    Type: Application
    Filed: May 27, 2003
    Publication date: February 26, 2004
    Applicant: Placer Dome Technical Services Limited
    Inventors: Jinxing Ji, Christopher Andrew Fleming, Paul George West-Sells, Ralph Peter Hackl
  • Method for thiosulfate leaching of precious metal-containing materials
    Patent number: 6660059
    Abstract: Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: December 9, 2003
    Assignee: Placer Dome Technical Services Limited
    Inventors: Jinxing Ji, Christopher Andrew Fleming, Paul George West-Sells, Ralph Peter Hackl
  • Method for thiosulfate leaching of precious metal-containing materials
    Publication number: 20020092377
    Abstract: Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to control polythionate production, and electrolytic solutions which provide relatively high rates of precious metal recovery.
    Type: Application
    Filed: May 11, 2001
    Publication date: July 18, 2002
    Inventors: Jinxing Ji, Christopher Andrew Fleming, Paul George West-Sells, Ralph Peter Hackl