Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4848145 | In-situ linear flow proppant conductivity test cell | Keith Edward Blaschke | 1989-07-18 |
| 4829811 | Fluid testing apparatus and method | Mark C. Ehlert | 1989-05-16 |
| 4818197 | Progessive cavity pump | — | 1989-04-04 |