Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6692187 | Flood gate for door | E. Carl Sprengle, Jr., Michael J. Graham | 2004-02-17 |
| 6485231 | Foundation flood gate with ventilation | Martin J. Montgomery | 2002-11-26 |
| 6287050 | Foundation flood gate with ventilation | Martin J. Montgomery | 2001-09-11 |