Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7597771 | Pultrusion method and related article | Robert D. Spaans, John L. Sigmund, Robert W. Jennings | 2009-10-06 |
| 7518060 | Prefabricated structural member having a wire routing system | Jeffery V. Miller, John L. Sigmund, Robert D. Spaans | 2009-04-14 |