Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11702606 | Compositions and methods for marking hydrocarbon compositions with non-mutagenic dyes | Michael R. Friswell, Thomas E. Nowakowski | 2023-07-18 |
| 10774280 | Compositions and methods for marking hydrocarbon compositions with non-mutagenic dyes | Michael R. Friswell, Thomas E. Nowakowski | 2020-09-15 |
| 6274381 | Method for invisibly tagging petroleum products using visible dyes | Theodore D. Pauls, Susan I. Steuer, Brian Foley, Michael J. Denci | 2001-08-14 |
| 6083285 | N,N-dialkylaniline azo dye solutions | Mike Friswell, Justin J. Frederico | 2000-07-04 |
| 5984983 | Use of carbonyl compounds as markers | Anjali Asgaonkar | 1999-11-16 |
| 5962330 | Method for detecting acid- and base-extractable markers | Justin J. Frederico | 1999-10-05 |