Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4904796 | Preparation of a blue anthraquinonoid disperse dye of 1,4-naphthoquinone-[2,]-phthalimides | Helmut Hoch | 1990-02-27 |
| 4871481 | Preparation of 1,4-diamino-2,3-dicyanoanthraquinone | Peter Miederer | 1989-10-03 |