Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5685881 | Aromatic allylaminonitro compounds, hair dye compositions containing aromatic allylaminonitio compounds, and synthetic and natural fiber dyeing process | David Rose, Horst Hoeffkes, Iduna Matzik | 1997-11-11 |
| 5609650 | Dyeing of keratin fibres with indolines using metal salts as catalysts | Georg Knuebel, Horst Hoeffkes, Winifried Neuhaus | 1997-03-11 |