Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5449552 | White opaque barrier layer film with excellent lay-flat properties | Heiko Tamke, Karl Hammerschmidt | 1995-09-12 |
| 5230948 | Metal-free barrier-layer films | Holger Preiss, Klaus Lund | 1993-07-27 |
| 4456667 | Tamperproof document and a process for producing the same | Helmut Bergmann, Siegfried Eikemeier | 1984-06-26 |