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 | Werner Schafer, Rolf Schafer, Johan G. Aalbers, Jacob K. Smid | 1989-04-04 |
| 4808239 | Method of cleaning contact lens using compositions containing polyether carboxylic acid surfactant | Rolf Schafer | 1989-02-28 |