Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8596910 | Environmental culvert system | Ronald W. Hammerstedt, Michael D. Rae | 2013-12-03 |
| 6474907 | Environmentally compatible archway for road building | Barry C. Nybo | 2002-11-05 |
| 5216793 | Hose fitting removal apparatus | — | 1993-06-08 |
| 5068953 | Hose fitting removal apparatus | — | 1991-12-03 |