Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5809055 | Metallurgical vessel heated by direct current and having a bottom electrode | Heinz Stark | 1998-09-15 |
| 5733356 | Method and device for processing free-flowing materials | Gero Rath, Wolfgang Richter, Hermann Staubner | 1998-03-31 |
| 5566200 | Process and device for disposal of filter materials | Heinz Stark | 1996-10-15 |
| 5500870 | Process and device for the extraction of valuable substances | Heinz Stark | 1996-03-19 |
| 4907244 | Electric reduction furnace | Heinz Stark | 1990-03-06 |
| 4406008 | Three phase arc melting and reduction furnace | Heinz Stark | 1983-09-20 |