Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4357245 | Water-soluble copolymer and its preparation | Friedrich Engelhardt, Martin Hille, Heinz Wittkus | 1982-11-02 |
| 4309523 | Water-soluble copolymer of acrylamidomethylpropanesulfonic acids salts | Friedrich Engelhardt, Martin Hille, Heinz Wittkus | 1982-01-05 |