Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5679332 | Hair keratin-reducing cysteine esters and compositions for permanent shaping of hair based on same | Guenther Lang, Gerhard Maresch | 1997-10-21 |
| 5637115 | Oxidation hair dye compositions containing developers, couplers, and AZO dyes | Wolfgang Balzer | 1997-06-10 |