Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE40729 | Liquid pavement marking compositions | Mark D. Purgett, David C. May, Mark D. Zender, Daniel J. Willie | 2009-06-09 |
| RE40088 | Liquid pavement marking compositions | Mark D. Purgett, David C. May, Mark D. Zender, Daniel J. Willie | 2008-02-19 |