Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6126360 | Raised retroreflective pavement marker | David C. May, Sithya S. Khieu, Cristina U. Thomas, Ronald W. Gerdes, David J. Lundin | 2000-10-03 |
| 5981033 | Pavement marking tape | Dale H. Haunschild, Neil A. Hodson, Terrence W. Miller, Larry K. Stump, James H. C. Harper +1 more | 1999-11-09 |