Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6967249 | Photochromic 3H-naphtho[2,1-b]-pyran compounds and photochromic articles produced therewith | Manfred Melzig, Udo Weigand | 2005-11-22 |
| 6881850 | Heterocyclically annellated indenochromene derivatives | Manfred Melzig, Udo Weigand | 2005-04-19 |