Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5775365 | Flood protection sewer backflow control valve and adapter assembly | Douglas A. Kieper, George H. Hunt | 1998-07-07 |
| 5577531 | Flood protection sewer backflow control valve and adapter assembly | Douglas A. Kieper, George H. Hunt | 1996-11-26 |