Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6079442 | Valve actuator | Michael J. Bertoja, Francis William Johnston, David Gent | 2000-06-27 |
| 6003837 | Valve actuator | Michael J. Bertoja, Francis William Johnston, David Gent | 1999-12-21 |
| 5564461 | Assembly for connecting an actuator to a rotary valve | Frank W. Johnston, Lawrence F. Boyd | 1996-10-15 |
| 5314165 | Rotary valve | John Dernovsek | 1994-05-24 |
| 5305781 | Valve positioning monitoring apparatus | Frank W. Johnston | 1994-04-26 |
| 5178187 | Valve position indicating apparatus | Frank W. Johnston | 1993-01-12 |
| 5152501 | Butterfly valve | — | 1992-10-06 |