Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885199 | Fiber-reinforced silicon nitride composite ceramics | Craig A. Willkens | 1989-12-05 |
| 4869943 | Fiber-reinforced silicon nitride ceramics | Stephen D. Hartline, George A. Rossetti, Jr. | 1989-09-26 |