Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8012318 | Process for multiple stage direct electrowinning of copper | John O. Marsden, Susan R Brewer, Joanna M. Robertson, David R. Baughman, Philip Thompson +2 more | 2011-09-06 |
| 7736488 | Process for recovery of copper from copper-bearing material using pressure leaching, direct electrowinning and solvent/solution extraction | John O. Marsden, Susan R Brewer, Joanna M. Robertson, David R. Baughman, Philip Thompson +2 more | 2010-06-15 |
| 7722756 | Process for multiple stage direct electrowinning of copper | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2010-05-25 |
| 7666371 | Method for recovering metal values from metal-containing materials using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman | 2010-02-23 |
| 7517384 | Method for improving metals recovery using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2009-04-14 |
| 7485216 | Process for recovery of copper from copper-bearing material using pressure leaching, direct electrowinning and solvent/solution extraction | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2009-02-03 |
| 7476308 | Process for multiple stage direct electrowinning of copper | John O. Marsden, Joanna M. Robertson, David R. Baughman, Phillip Thompson, Wayne W. Hazen +1 more | 2009-01-13 |
| 7473413 | Method for recovering metal values from metal-containing materials using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman | 2009-01-06 |
| 7462272 | Process for multiple stage direct electrowinning of copper | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2008-12-09 |
| 7341700 | Method for recovery of metals from metal-containing materials using medium temperature pressure leaching | John O. Marsden, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman +1 more | 2008-03-11 |
| 7125436 | Method for improving metals recovery using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2006-10-24 |
| 7041152 | Method for processing elemental sulfur-bearing materials using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman | 2006-05-09 |
| 6972107 | System for direct electrowinning of copper | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2005-12-06 |
| 6893482 | Method for improving metals recovery using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2005-05-17 |
| 6890371 | Method for processing elemental sulfur-bearing materials using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman | 2005-05-10 |
| 6680034 | Method for recovering metal values from metal-containing materials using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman | 2004-01-20 |
| 6676909 | Method for recovery of metals from metal-containing materials using medium temperature pressure leaching | John O. Marsden, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman +1 more | 2004-01-13 |
| 6663689 | Process for direct electrowinning of copper | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2003-12-16 |
| 6626979 | Method for improving metals recovery using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2003-09-30 |
| 6497745 | Method for processing elemental sulfur-bearing materials using high temperature pressure leaching | John O. Marsden, Joanna M. Robertson, Wayne W. Hazen, Philip Thompson, David R. Baughman | 2002-12-24 |
| 6451088 | Method for improving metals recovery using high temperature leaching | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2002-09-17 |
| 6451089 | Process for direct electrowinning of copper | John O. Marsden, Joanna M. Robertson, David R. Baughman, Philip Thompson, Wayne W. Hazen +1 more | 2002-09-17 |
| 5071477 | Process for recovery of gold from refractory ores | Kenneth G. Thomas, Herman Pieterse, Kevin S. Fraser | 1991-12-10 |