Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4935502 | Diazo compounds, a process for their preparation and their use as colorants | Heinrich Hamal | 1990-06-19 |
| 4870164 | Symmetrical and asymmetrical disazo compounds having a bis-aryloxy alkane bridge | Heinrich Hamal | 1989-09-26 |
| 4231964 | Nitroamines, processes for their manufacture and their use as diazo components | Heinrich Hamal | 1980-11-04 |