Issued Patents 2003
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6655098 | Stair module support and leveling system | William A. Dillen, II, Donald E. Dahowski, Matthew Cramer, James G. Wilson | 2003-12-02 |
| 6612780 | Modular trench drain system | Donald E. Dahowski, James G. Wilson, Christopher B. Presler, Matthew Schlager | 2003-09-02 |