Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6790880 | Liquid pavement marking compositions | Mark D. Purgett, David C. May, Mark D. Zender, Daniel J. Willie | 2004-09-14 |
| 6551014 | Raised pavement marker with improved lens | Sithya S. Khieu, Gregory E. Gilligan | 2003-04-22 |
| 6451874 | Liquid pavement marking compositions | Mark D. Purgett, David C. May, Mark D. Zender, Daniel J. Willie | 2002-09-17 |
| 6166106 | Liquid pavement marking compositions | Mark D. Purgett, David C. May, Mark D. Zender, Daniel J. Willie | 2000-12-26 |
| 4725494 | Retroreflective sheeting | Louis C. Belisle, Raymond E. Grunzinger | 1988-02-16 |
| 4721649 | Retroreflective sheeting | Louis C. Belisle, Raymond E. Grunzinger | 1988-01-26 |