Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4845060 | Sinterable Si.sub.3 N.sub.4 powder and a process for its preparation | Ulrike Wickel, Benno Laubach | 1989-07-04 |
| 4798714 | Process for the preparation of silicon nitride low in carbon content | Lothar Schonfelder | 1989-01-17 |