Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5089412 | Bacteria for oxidizing multimetallic sulphide ores | Ralph Peter Hackl, Frank R. Wright | 1992-02-18 |
| 4987081 | Chemical/biological process to oxidize multimetallic sulphide ores | Ralph Peter Hackl, Frank R. Wright | 1991-01-22 |
| 4888293 | Adapting bacteria to low pH and high arsenic concentration for use in oxidizing sulfide ores | Ralph Peter Hackl, Frank R. Wright | 1989-12-19 |
| 4571387 | Biological-acid leach process | Ralph Peter Hackl, Richard W. Lawrence, Andrew I. Vizsolyi | 1986-02-18 |