Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6536740 | Disconnected piston for a valve actuator | Randall Dean Harkins, Thomas P. Kelly | 2003-03-25 |
| 4926937 | Compound linkage-arm assembly for use in bore-hole tools | — | 1990-05-22 |