Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5281480 | Optically variable multilayer structure on flexible web | Roger W. Phillips, Thomas Mayer | 1994-01-25 |
| 5279657 | Optically variable printing ink | Roger W. Phillips, Thomas Mayer | 1994-01-18 |