Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837376 | Process for refining silicon and silicon purified thereby | Ingo Schwirtlich, Werner Kannchen | 1989-06-06 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4837376 | Process for refining silicon and silicon purified thereby | Ingo Schwirtlich, Werner Kannchen | 1989-06-06 |