Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5826915 | Method of using thermochromic material on security documents and product | — | 1998-10-27 |
| 5644352 | Multicolor heat-sensitive verification and highlighting system | John C. H. Chang, Eric Wendler | 1997-07-01 |
| 5618063 | Multicolor heat-sensitive verification and highlighting system | John C. H. Chang, Eric Wendler | 1997-04-08 |