Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6485231 | Foundation flood gate with ventilation | E. Carl Sprengle, Sr. | 2002-11-26 |
| 6287050 | Foundation flood gate with ventilation | E. Carl Sprengle, Sr. | 2001-09-11 |
| 5944445 | Device and method for relieving flooding from enclosed space | — | 1999-08-31 |