Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4846083 | Method of processing contaminated mineral substances | — | 1989-07-11 |
| 4806158 | Process of reducing fine-grained iron-containing material by means of solid carbonaceous reducing agents | Martin Hirsch, Fritz Rose | 1989-02-21 |