Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4614623 | Sulfonation of crude oils with gaseous SO.sub.3 to produce petroleum sulfonates | Donald E. Schroeder, Jr., Mark A. Plummer | 1986-09-30 |
| 4581128 | Hydrocarbon desulfurization process | Mark A. Plummer | 1986-04-08 |
| 4560517 | Sulfonation of crude oils with gaseous SO.sub.3 to produce petroleum sulfonates | Donald E. Schroeder, Jr., Mark A. Plummer | 1985-12-24 |