Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4932994 | Evaporation inhibitors | Josef Koester, Adolf Asbeck, Holger Tesmann, Margarete Gruenert, Konrad Albrecht +1 more | 1990-06-12 |
| 4793850 | Evaporation inhibitor compositions | Josef Koester, Karl Schmid, Konrad Albrecht, Paul Bittner | 1988-12-27 |