Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5645655 | Process to anneal steel strips in an annealing furnace without generating carbon black | Peter Zylla | 1997-07-08 |
| 5605104 | Method and device for melting down solid combustion residues | Frank Lichtmann | 1997-02-25 |