Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865661 | Product of a high-strength nitrogen containing fully austenitic cobalt steel having yield strengths above 600 N/MM2 | Peter Dahlmann, Johannes Jachowski, Gerald Stein | 1989-09-12 |
| 4844747 | Process of producing a composite roll | Johannes Jachowski, Udo Riepe, Gerald Stein | 1989-07-04 |