Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6679654 | Flood control system | Donn Wittenberg, Bruce A. Knobloch | 2004-01-20 |
| 6334736 | Flood barrier | Harold W. Johnson, Donn Wittenberg | 2002-01-01 |
| 5971661 | Water containment device and levee for impeding a flow of water | Harold W. Johnson, Don Wittenberg | 1999-10-26 |