Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887629 | Plug valve and method of assembly | John V. Ballun | 1989-12-19 |
| 4863144 | Plug valve | John V. Ballun | 1989-09-05 |
| 4491300 | Valve with improved sealing structure | Ronald E. Barker | 1985-01-01 |