Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4831075 | Leather treatment agent | Harro Traubel, Helmut Woynar | 1989-05-16 |
| 4810251 | Fatliquoring solution dispersion or emulsion and a process for treating leather therewith | Harro Traubel, Helmut Woynar, Hans J. Focks | 1989-03-07 |