Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4883586 | Process for beneficiating ores containing fine particles | Laurence W. Bierman, Roger B. Humberger | 1989-11-28 |
| 4836854 | Stabilization of setting times of phosphate-bonded magnesia cements | Laurence W. Bierman | 1989-06-06 |