|
| US3990510 | 18 nov. 1974 | 9 nov. 1976 | | Releasable well anchor tool |
| US4051899 | 5 oct. 1976 | 4 oct. 1977 | Otis Engineering Corporation | Reset and pulling tool for manipulating well safety valve |
| US4260021 | 9 janv. 1979 | 7 avr. 1981 | Hydril Company | Plug catcher tool |
| US4667736 | 24 mai 1985 | 26 mai 1987 | Otis Engineering Corporation | Surface controlled subsurface safety valve |
| US4722393 | 29 avr. 1987 | 2 févr. 1988 | Otis Engineering Corporation | Latch assembly for well tools |
| US8201623 | 4 sept. 2009 | 19 juin 2012 | Baker Hughes Incorporated | Reduced wear position indicating subterranean tool |
