Issued Patents All Time
Showing 26–35 of 35 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 |
| 5246158 | Method of manufacturing a selective isolation screen | Derry D. Sparlin | 1993-09-21 |
| 5069279 | Well structure having a screen element with wire supporting rods | — | 1991-12-03 |
| 4818403 | Double cylinder screen | — | 1989-04-04 |
| 4657079 | Screen | — | 1987-04-14 |
| 4578248 | Distributor/collector assembly | — | 1986-03-25 |
| 4366608 | Method for manufacturing fluid contacting device | — | 1983-01-04 |