Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834928 | Doped silicon nitride article | — | 1989-05-30 |
| 4814128 | Process for making a homogeneous doped silicon nitride article | Sheldon Lieberman, Elizabeth A. Trickett | 1989-03-21 |