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| US4846279 | 13 Ene 1988 | 11 Jul 1989 | Marathon Oil Company | Method and means for introducing treatment fluid into a well bore |
| US4899820 | 21 Mar 1988 | 13 Feb 1990 | Marathon Oil Company | Method and means for injecting well treatment fluid |
| US7419937 | 19 Dic 2003 | 2 Sep 2008 | Schlumberger Technology Corporation | Method for providing treatment chemicals in a subterranean well |
| USH635 | 3 Abr -13 | | | Injection mandrel |
