Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9789889 | Slack adjuster for narrow gauge railroad cars | Brian Graves, Jeffrey F. Sauter, Derick Call | 2017-10-17 |
| 7514050 | Processing of acid-consuming mineral materials involving treatment with acidic biooxidation effluent | Fritz-Peter Sawyer | 2009-04-07 |
| 6696283 | Particulate of sulfur-containing ore materials and heap made therefrom | David L. Hill | 2004-02-24 |
| 6383458 | Biooxidation process for recovery of metal values from sulfur-containing ore materials | David L. Hill | 2002-05-07 |
| 5834294 | Biooxidation process for recovery of metal values from sulfur-containing ore materials | David L. Hill | 1998-11-10 |
| 5332559 | Biooxidation process for recovery of metal values from sulphur-containing ore materials | David L. Hill | 1994-07-26 |
| 5246486 | Biooxidation process for recovery of gold from heaps of low-grade sulfidic and carbonaceous sulfidic ore materials | David L. Hill | 1993-09-21 |
| 5244493 | Biometallurgical treatment of precious metal ores having refractory carbon content | Charles F. Kulpa | 1993-09-14 |
| 5127942 | Microbial consortium treatment of refractory precious metal ores | Charles F. Kulpa | 1992-07-07 |
| 4992179 | Metal recovery | Corale L. Brierley, Raymond F. Decker, George M. Goyak | 1991-02-12 |
| 4898827 | Metal recovery | Corale L. Brierley, Raymond F. Decker, George M. Goyak | 1990-02-06 |
| 4789481 | Metal recovery | Corale L. Brierley, Raymond F. Decker, George M. Goyak | 1988-12-06 |
| 4729788 | Thermophilic microbial treatment of precious metal ores | Stephen Hutchins, Michael S. Davidson, Corale L. Brierley | 1988-03-08 |
| 4690894 | Treatment of microorganisms with alkaline solution to enhance metal uptake properties | Corale L. Brierley, Raymond F. Decker, George M. Goyak | 1987-09-01 |