Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883776 | Self-reinforced silicon nitride ceramic of high fracture toughness and a method of preparing the same | Aleksander J. Pyzik, Douglas B. Schwarz, Donald R. Beaman | 1989-11-28 |