Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6832783 | Optically-based methods and apparatus for performing sorting, coding and authentication using a gain medium that provides a narrowband emission | — | 2004-12-21 |
| 6795464 | Temperature control of laser action in scattering media | — | 2004-09-21 |
| 6780564 | Methods and apparatus for rendering an optically encoded medium unreadable and tamper-resistant | Charles M. Zepp, Andrei Smuk, Marianne Krieg-Kowald | 2004-08-24 |
| 6709802 | Methods and apparatus for rendering an optically encoded medium unreadable | Charles M. Zepp, Kenneth S. Norland | 2004-03-23 |