Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5623075 | Thiazolemethine dyes | Stefan Beckmann, Karl-Heinz Etzbach | 1997-04-22 |
| 5616678 | Azo dyestuff- and urethane-containing polyadduct and its use in nonlinear optics | Stefan Beckmann, Karl-Heinz Etzbach, Karl H aberle | 1997-04-01 |