Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5156653 | Silent markers for petroleum, method of tagging, and method of detection | Michael R. Friswell | 1992-10-20 |
| 4764474 | Method for detecting a tagging compound | — | 1988-08-16 |
| 4735631 | Colored petroleum markers | — | 1988-04-05 |
| 4514503 | Reagent and process for detecting furfural in petroleum products | — | 1985-04-30 |
| 4209302 | Marker for petroleum fuels | — | 1980-06-24 |