Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5336474 | Process for leaching of precious metals | Manfred Diehl, Karl-Heinz Koenig, Eckhart Krone, Norbert Steiner, Jochen Ullmann +1 more | 1994-08-09 |
| 5275791 | Process for the leaching of gold and silver with cyanidic leaching solution and controlled addition of hydrogen peroxide | Helmut Knorre, Andrew Griffiths, Joachim Fischer | 1994-01-04 |