Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12258718 | Paving machine having a containment basin | Douglas R. Olsen, Huachun Zhai | 2025-03-25 |
| 11993896 | Adjustable paving machine | Douglas R. Olsen, Huachun Zhai | 2024-05-28 |
| 11753778 | Adjustable paving machine | Douglas R. Olsen, Huachun Zhai | 2023-09-12 |