Issued Patents All Time
Showing 76–84 of 84 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4716974 | Method and apparatus for coring with an in situ core barrel sponge | J. Stanley Davis | 1988-01-05 |
| 4664205 | Hydraulic inner barrel in a drill string coring tool | Kelly Knighton, J. Stanley Davis | 1987-05-12 |
| 4607710 | Cammed and shrouded core catcher | — | 1986-08-26 |
| 4606416 | Self activating, positively driven concealed core catcher | Kelly Knighton, J. Stanley Davis | 1986-08-19 |
| 4605075 | Shrouded core catcher | J. Stanley Davis | 1986-08-12 |
| 4603749 | Apparatus for downward displacement of an inner tube within a coring barrel | J. Stanley Davis | 1986-08-05 |
| 4580635 | Automatic drill pipe inside wiper | Craig R. Hyland | 1986-04-08 |
| 4553613 | Hydraulic lift inner barrel in a drill string coring tool | — | 1985-11-19 |
| 4552229 | Externally powered core catcher | Craig R. Hyland | 1985-11-12 |