Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5141416 | Plunger for a downhole reciprocating oil well pump and the method of manufacture thereof | Michael L. Cognevich | 1992-08-25 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5141416 | Plunger for a downhole reciprocating oil well pump and the method of manufacture thereof | Michael L. Cognevich | 1992-08-25 |