Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7223038 | Spreading apparatus for flowable materials | David E. Livingstone, Ronald W. Matechuk | 2007-05-29 |
| 5895170 | Flexible raised pavement marker, mounting device and method | David C. Chambers | 1999-04-20 |