Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4306428 | Torque drive mechanism | Reynaldo Calderon | 1981-12-22 |
| 4237978 | Method for cleaning a helical spring sand screen in a well | Reynaldo Calderon | 1980-12-09 |
| 4201266 | Rotatable washer self-cleaning helical spring screen and methods | Reynaldo Calderon | 1980-05-06 |