Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6686468 | H-annellated benzo[f]chromenes | Manfred Melzig, Udo Weigand | 2004-02-03 |
| 6683709 | Photochromic pyran compounds | Udo Weigand, Manfred Melzig | 2004-01-27 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6686468 | H-annellated benzo[f]chromenes | Manfred Melzig, Udo Weigand | 2004-02-03 |
| 6683709 | Photochromic pyran compounds | Udo Weigand, Manfred Melzig | 2004-01-27 |