Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5676317 | Method and apparatus for combined grinding of at least two materials of differing grindability | Gotthardt Blasczyk | 1997-10-14 |
| 5642863 | Method of extracting metals from ore material | Johann Knecht | 1997-07-01 |