Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4846871 | Lignosulfonate treated fertilizer particles | — | 1989-07-11 |
| 4846888 | Oil well drilling cement dispersant | — | 1989-07-11 |
| RE32895 | Solubilized lignosulfonate derivatives | Michael E. Sanford | 1989-03-28 |