Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859443 | Preparation of silicon nitride powder | — | 1989-08-22 |
| 4849395 | Preparation of amorphous metal/magnesium silicates | Joachim Stabenow, Knut Eger, Matthias Irgang, Guenter Zirker | 1989-07-18 |