Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6786513 | Security document with a perforation pattern | Arnoud Augustinus, Jan Jasper van den Berg | 2004-09-07 |
| 6739627 | Security feature comprising a perforation pattern | Abraham Elenbaas | 2004-05-25 |
| 6302444 | Document made fraud-proof by an irreversibly distortable weakening pattern | — | 2001-10-16 |