Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6729795 | Modular drain and drain system | Donald E. Dahowski, James G. Wilson | 2004-05-04 |
| 6612780 | Modular trench drain system | Donald E. Dahowski, James G. Wilson, Allen L. Kinner, Matthew Schlager | 2003-09-02 |