Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5702523 | Rotating head for crystal pulling systems | Winfried Schulmann, Helmut Kaiser | 1997-12-30 |
| 5631511 | Gear motor with an electric motor having a hollow shaft | Winfried Schulmann, Helmut Kaiser | 1997-05-20 |