Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5976717 | Coating comprising a photochromic material, a method for its production as well as its use | Karl Holdik, Clemens S. Bechinger, Eckehard Wirth | 1999-11-02 |
| 4504357 | Security with identifying marks printed in the substance of a paper layer | Hans J. Holbein, Walter Schneider | 1985-03-12 |