Issued Patents All Time
Showing 76–81 of 81 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5424119 | Polymeric sheet having oriented multilayer interference thin film flakes therein, product using the same and method | Roger W. Phillips, Patrick K. Higgins, Charles T. Markantes | 1995-06-13 |
| 5278590 | Transparent optically variable device | Roger W. Phillips | 1994-01-11 |
| 5214530 | Optically variable interference device with peak suppression and method | Roger W. Phillips | 1993-05-25 |
| 5005719 | Tamper evident optical device and article utilizing the same | Roger W. Phillips, Vernon C. Spellman, Wayne L. Gossett, Marc A. Kamerling, David W. Todd +1 more | 1991-04-09 |
| 4840281 | Tamper evident optical device and article utilizing the same | Roger W. Phillips, Vernon C. Spellman, Wayne L. Gossett, Marc A. Kamerling | 1989-06-20 |
| 4838648 | Thin film structure having magnetic and color shifting properties | Roger W. Phillips | 1989-06-13 |