Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828811 | Method for producing phosphoric acid from phosphate ore | Gary Derdall, William R. Erickson, James D. Wilson | 1989-05-09 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4828811 | Method for producing phosphoric acid from phosphate ore | Gary Derdall, William R. Erickson, James D. Wilson | 1989-05-09 |