Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4877596 | Process for the production of low carbon silicon | Peter Woditsch, Wolfgang Koch | 1989-10-31 |
| 4837376 | Process for refining silicon and silicon purified thereby | Horst Lange, Werner Kannchen | 1989-06-06 |