Issued Patents 2003
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6570648 | Machine-detectable security marking with an increased level of proof against forgery, production of the security marking, and security system comprising this security marking | Christoph Muller-Rees, Jurgen Kupfer, Georg Schwalb | 2003-05-27 |