Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8002190 | Stability of covert pigments | Daoshen Bi, Robert L. Jones | 2011-08-23 |
| 7086666 | Identification card with embedded halftone image security feature perceptible in transmitted light | — | 2006-08-08 |
| 6752432 | Identification card with embedded halftone image security feature perceptible in transmitted light | — | 2004-06-22 |