|
| US4291763 | 5 Nov 1979 | 29 Sep 1981 | | Dispenser for oil well treating chemicals |
| US4846279 | 13 Jan 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 |
| US5533570 | 13 Jan 1995 | 9 Jul 1996 | Halliburton Company Atlantic Richfield Company | Apparatus for downhole injection and mixing of fluids into a cement slurry |
| US5718287 | 28 Mar 1996 | 17 Feb 1998 | Halliburton Company | Apparatus for downhole injection and mixing of fluids into a cement slurry |
| US7419937 | 19 Dec 2003 | 2 Sep 2008 | Schlumberger Technology Corporation | Method for providing treatment chemicals in a subterranean well |