Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6646016 | Aromatic aldehyde resins and their use as emulsion breakers | Frank Holtrup, Elisabeth Wasmund, Michael Feustel | 2003-11-11 |
| 6465528 | Aromatic aldehyde resins and their use as emulsion breakers | Frank Holtrup, Elisabeth Wasmund, Michael Feustel | 2002-10-15 |