Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4252652 | Process of using a semi-permeable membrane of acrylonitrile copolymers | Klaus Elfert, Hans J. Rosenkranz, Gerhard D. Wolf | 1981-02-24 |
| 4245110 | Polyalkylene oxide-containing urethane polyols with sulphonic acid groups | Helmut Engelhard, Gerhard D. Wolf, Gunther Nischk | 1981-01-13 |
| 4221903 | Semipermeable membranes of heterocyclic copolyamides | Klaus Elfert, Gerhard D. Wolf, Hans Egon Kunzel | 1980-09-09 |
| 4217227 | Semipermeable membranes of copolyamides | Klaus Elfert, Gerhard D. Wolf, Hans Egon Kunzel | 1980-08-12 |