Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4874638 | Process for improving the adhesion of polymeric substances | Gerald Fleischmann, Alfred Prasse, Kunigunde Kolbig | 1989-10-17 |
| 4851047 | Process for preparing water-repellent articles from gypsum powder containing hydrophobic agents | Ulrich Demlehner, Heinrich Hopf, Erich Pilzweger, Otto Zeller | 1989-07-25 |