Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5082552 | Hydrotreating with catalyst particles using length and density grading | Robert E. Ellingham | 1992-01-21 |
| 4720473 | Production of improved catalyst-type particles using length and density grading | Robert E. Ellingham | 1988-01-19 |