Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5279993 | Gas injection stone and process of manufacture thereof | Hans Rothfuss, Herbert Metzger, Manfred Winkelmann | 1994-01-18 |
| 5160478 | Gas flushing apparatus for metallurgical vessel | Hans Rothfuss, Herbert Metzger, Manfred Winkelman, Hans G. Winkler | 1992-11-03 |
| 4952343 | Process for the manufacture of thin plates with low binding strength | Norbert Gerharz, Eduard Kessler, Albert Kleinevoss, Hans Kleudgen, Bernd Stein | 1990-08-28 |
| 4905971 | Refractory ceramic sink | Hans Rothfuss, Jurgen Sauthoff | 1990-03-06 |
| 4842172 | Composite refractory member | Albert Kleinevoss | 1989-06-27 |