Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4369171 | Production of pitch and coke from raw petroleum coke | Lloyd S. Grindstaff | 1983-01-18 |
| 4291008 | Process for calcining and desulfurizing petroleum coke | Harry L. Hsu, Lloyd I. Grindstaff | 1981-09-22 |