Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818246 | Process for improving the light-fastness of leather dyeings | Alois Puntener, Gerhard Back | 1989-04-04 |
| 4799933 | Process for the trichromatic dyeing of leather | Fabio Beffa | 1989-01-24 |