Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818440 | Novel polyether carboxylic acid derivatives, as well as their uses | Rolf Schafer, Doris Schafer, Johan G. Aalbers, Jacob K. Smid | 1989-04-04 |
| 4798759 | Multi-layer polyester film for magnetic tape | Hermann Dallman, Hartmut Hensel | 1989-01-17 |