Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5653423 | Knife gate valve with mechanically retained gate seat | Calvin Young, David L. Gambetta, Jon A. Hansen, Darrel J. DesRochers, Richard A. Sutherland | 1997-08-05 |
| 4773627 | Gate valve | Jeffrey M. Bowman | 1988-09-27 |
| 4703915 | Knife gate valve with semi-hard, resilient seat | — | 1987-11-03 |