Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7115164 | Preparation of yellow pigments | George H. Robertson, Edward Sung | 2006-10-03 |
| 6537362 | Polyphosphoric acid swelling of organic pigments | Edward Sung, Humberto Velasquez, George H. Roberston | 2003-03-25 |