Issued Patents 1994
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5355948 | Permeable isolation sectioned screen | Derry D. Sparlin | 1994-10-18 |
| 5355949 | Well liner with dual concentric half screens | Derry D. Sparlin | 1994-10-18 |
| 5311942 | Well screen having a protective frame for a horizontal or high-angle well | — | 1994-05-17 |
| 5307984 | Method of manufacturing a selective isolation screen | Derry D. Sparlin | 1994-05-03 |