Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5714291 | System for authenticating printed or reproduced documents | Louis H. Liang, William McGinness | 1998-02-03 |
| 5666417 | Fluorescence authentication reader with coaxial optics | Louis H. Liang, William J. Ryan, Donald L. Wray | 1997-09-09 |
| 5574790 | Fluorescence authentication reader with coaxial optics | Louis H. Liang, William J. Ryan, David E. Silverglate, Donald L. Wray | 1996-11-12 |
| 5548106 | Methods and apparatus for authenticating data storage articles | Louis H. Liang, William J. Ryan | 1996-08-20 |
| 5418855 | Authentication system and method | Louis H. Liang, William J. Ryan, Donald L. Wray | 1995-05-23 |