Issued Patents 2011
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7991198 | Visible authentication patterns for printed document | Jian Zhao, Niels J. Thorwirth | 2011-08-02 |
| 7937588 | Techniques for detecting, analyzing, and using visible authentication patterns | Jian Zhao | 2011-05-03 |