Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880755 | Sialon cutting tool composition | — | 1989-11-14 |
| 4852999 | Cutting tool | Elizabeth R. Billman, Bernard North | 1989-08-01 |
| 4826791 | Silicon carbide-alpha prime sialon beta prime sialon | Klaus-Markus Peters, Joyce L. Swiokla | 1989-05-02 |
| 4820663 | Whisker reinforced ceramic and a method of clad/hot isostatic pressing same | Joyce L. Swiokla, Elizabeth R. Billman | 1989-04-11 |
| 4801510 | Alumina coated silcon carbide whisker-alumina composition | Elizabeth R. Billman | 1989-01-31 |