Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4366024 | Process for making solar cell base material | Gerhard Ast, Dieter Helmreich, Hans-Dieter Miller, Erhard Sirtl | 1982-12-28 |
| 4312850 | Semicontinuous process for the manufacture of pure silicon | Claus Holm, Erhard Sirtl | 1982-01-26 |