Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11542449 | Marker compositions with nitrogen compounds, and methods for making and using same | Justin J. Frederico | 2023-01-03 |
| 11385218 | Marker compositions, and methods for making and using same | Justin J. Frederico | 2022-07-12 |
| 10509020 | Marker compositions, and methods for making and using same | Justin J. Frederico | 2019-12-17 |
| 7825159 | Mixtures of aromatic esters for marking or tagging organic products, marker compositions comprising the same and manufacturing methods thereof | Justin J. Frederico, Bharat Desai, Michael J. Smith | 2010-11-02 |
| 5560855 | Method of tagging and subsequently indentifying refrigerant lubricants | Michael J. Denci, Peter J. Heffron | 1996-10-01 |
| 5504199 | Method of introducing dyes to ethanol | Alejandra Zimin, Peter A. Caputo, Michael R. Friswell, David L. Booth | 1996-04-02 |
| 5490872 | Acid extractable petroleum fuel markers | Michael R. Friswell, Michael J. Hallisy | 1996-02-13 |
| 5306343 | Tagging and identifying asphalt additives | Walter A. Richardson, Alejandro Zimin, Sr., James J. Fuerholzer, Michael R. Friswell, Peter A. Caputo | 1994-04-26 |
| 5205840 | Markers for petroleum, method of tagging, and method of detection | Michael R. Friswell | 1993-04-27 |
| 5049189 | Method of preparing a solution of sulfonated aryl azo/diaryl guanidine-complexed dye | Michael R. Friswell, Alejandro Zimin, Sr. | 1991-09-17 |