Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6755441 | Machine detectable document of value | Gerhard Stenzel | 2004-06-29 |
| 6726813 | Security device and method for producing it | Gregor Grauvogl, Jurgen Schutzmann, Friedrich Kretschmar | 2004-04-27 |
| 6688221 | Valuable document with a security element | — | 2004-02-10 |