Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5775365 | Flood protection sewer backflow control valve and adapter assembly | Stuart E. Hayden, Douglas A. Kieper | 1998-07-07 |
| 5577531 | Flood protection sewer backflow control valve and adapter assembly | Stuart E. Hayden, Douglas A. Kieper | 1996-11-26 |