Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5089412 | Bacteria for oxidizing multimetallic sulphide ores | Ralph Peter Hackl, Albert Bruynesteyn | 1992-02-18 |
| 4987081 | Chemical/biological process to oxidize multimetallic sulphide ores | Ralph Peter Hackl, Albert Bruynesteyn | 1991-01-22 |
| 4888293 | Adapting bacteria to low pH and high arsenic concentration for use in oxidizing sulfide ores | Ralph Peter Hackl, Albert Bruynesteyn | 1989-12-19 |