Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822583 | Phosphate feed material for phosphorus electric furnaces and production of same | Lewis L. Hammermeister, Jared S. Sproul | 1989-04-18 |
| 4806326 | Phosphate feed material for phosphorus electric furnace | — | 1989-02-21 |