Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4903362 | Sulfited fats as oiling agents for leather and skins | Hans-Herbert Friese, Friedrich Pieper | 1990-02-27 |
| 4800045 | Sulfited fats | Hans-Herbert Friese, Friedrich Pieper | 1989-01-24 |