| 10015354 |
Authentication device and associated authentication method based on a difference in alignment or a similarity in relative position of features of unique identifiers printed over images and/or text |
— |
2018-07-03 |
| 9666008 |
Optically variable security device, and article employing same and method for verifying the authenticity of an article |
— |
2017-05-30 |
| 9234992 |
Optically variable device with diffraction-based micro-optics, method of creating the same, and article employing the same |
Robert E. Renton, Andrew K. Rowe, Paul Dunn |
2016-01-12 |
| 8488242 |
Optically variable device with diffraction-based micro-optics, method of creating the same, and article employing the same |
Robert E. Renton, Andrew K. Rowe, Paul Dunn |
2013-07-16 |
| 6361889 |
Tamperproof window seurable informational article |
— |
2002-03-26 |