Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5943144 | Process for the manufacture of non-replicable holograms possessing authenticity features and a reading device to check authenticity | Gunther Dausmann, Zishao Yang | 1999-08-24 |
| 4989929 | Process of making an achromatic hologram which is adapted to be reconstructed with white light | Gunther Dausmann, Rudi T. de Jongh | 1991-02-05 |