Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4813968 | Retanning process | Dolf Stockhausen, Hans-Georg Hartan, Alfons Landscheidt | 1989-03-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4813968 | Retanning process | Dolf Stockhausen, Hans-Georg Hartan, Alfons Landscheidt | 1989-03-21 |