Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6666897 | Black alcohol soluble dye formulation | Michael R. Friswell | 2003-12-23 |
| 5980593 | Silent fluorescent petroleum markers | Michael R. Friswell, Peter A. Caputo | 1999-11-09 |
| 5902750 | Tagging of waterborne compositions with oil-soluble markers | James J. Fuerholzer, Peter A. Caputo, James J. Baluyut | 1999-05-11 |
| 5707405 | Water-reducible nigrosine dye compositions | Peter A. Caputo | 1998-01-13 |
| 5603735 | Water-reducible dye compositions comprising solvent dyes and citrus solvents | Peter A. Caputo | 1997-02-18 |
| 5306343 | Tagging and identifying asphalt additives | Walter A. Richardson, James J. Fuerholzer, Michael R. Friswell, Michael P. Hinton, Peter A. Caputo | 1994-04-26 |
| 5142030 | Disazo colorants having a 4,4'-diaminobenzanilide tetrazo component | Michael R. Friswell, Adam E. Verillo | 1992-08-25 |
| 5049189 | Method of preparing a solution of sulfonated aryl azo/diaryl guanidine-complexed dye | Michael R. Friswell, Michael P. Hinton | 1991-09-17 |