Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5596402 | Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device | Roger W. Phillips | 1997-01-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5596402 | Viewing device and method for ascertaining simultaneously optical color shift characteristics of an optically variable device | Roger W. Phillips | 1997-01-21 |