Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847222 | Basic refractory shapes | David J. Michael | 1989-07-11 |
| 4833109 | Low thermal conductivity magnesite-spinel brick and method | Christopher L. Macey | 1989-05-23 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4847222 | Basic refractory shapes | David J. Michael | 1989-07-11 |
| 4833109 | Low thermal conductivity magnesite-spinel brick and method | Christopher L. Macey | 1989-05-23 |