Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5131477 | Method and apparatus for preventing drilling of a new well into an existing well | Edward R. Clinton, Scott D. Selfridge | 1992-07-21 |
| 5029641 | Inverted wellbore completion | — | 1991-07-09 |
| 4945994 | Inverted wellbore completion | — | 1990-08-07 |
| 4869323 | Cementing and rotating an upper well casing attached by swivel to a lower casing | — | 1989-09-26 |