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| US4685518 | 7 Ago 1985 | 11 Ago 1987 | Rickert Precision Industries, Inc. | Blast joint | | US5377751 | 29 Ene 1992 | 3 Ene 1995 | Rickert Precision Industries | Apparatus and method for centralizing downhole pipe and blast joints | | US5549333 | 8 Sep 1994 | 27 Ago 1996 | | Blast joint | | US7096946 | 30 Dic 2003 | 29 Ago 2006 | Baker Hughes Incorporated | Rotating blast liner |
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