Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5663386 | Method for marking mineral oils with amthraquinones | Christos Vamvakaris | 1997-09-02 |
| 5627077 | Anilines as markers for mineral oils | Rainer Dyllick-Brenzinger, Ulrike Schlosser | 1997-05-06 |