Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5787980 | Well screen having a uniform outer diameter | Tadayoshi Nagaoka | 1998-08-04 |
| 5476143 | Well screen having slurry flow paths | Tadayoshi Nagaoka, Jeff Ashton | 1995-12-19 |
| 5450898 | Gravity enhanced maintenance screen | Tadayoshi Nagaoka | 1995-09-19 |
| 5355949 | Well liner with dual concentric half screens | Tadayoshi Nagaoka | 1994-10-18 |
| 5355948 | Permeable isolation sectioned screen | Tadayoshi Nagaoka | 1994-10-18 |
| 5307984 | Method of manufacturing a selective isolation screen | Tadayoshi Nagaoka | 1994-05-03 |
| 5246158 | Method of manufacturing a selective isolation screen | Tadayoshi Nagaoka | 1993-09-21 |
| 4771829 | Well liner with selective isolation screen | — | 1988-09-20 |
| 4239084 | Acid soluble coating for well screens | Keith W. Sharp | 1980-12-16 |
| 4202411 | Acid soluble coating for well screens | Keith W. Sharp | 1980-05-13 |