Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE47618 | Acid dye mixture | Andreas Giehl | 2019-09-24 |
| 8323358 | Acid dye mixture | Andreas Giehl | 2012-12-04 |
| 7699898 | Metal complex dye mixtures | Oliver Steinau, Andreas Giehl | 2010-04-20 |