Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6045335 | Differential pressure operated free piston for lifting well fluids | — | 2000-04-04 |
| 5427504 | Gas operated plunger for lifting well fluids | Joseph B. Heath, Jr. | 1995-06-27 |
| 4923372 | Gas lift type casing pump | Paul L. Ferguson | 1990-05-08 |
| 4765403 | Apparatus for placing and removing well flow control devices | Douglas W. Crawford, William B. Crawford | 1988-08-23 |