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Referenced by

Citing PatentFiling dateIssue dateOriginal AssigneeTitle
US495363827 Jun 19884 Sep 1990The Charles Machine Works, Inc.Method of and apparatus for drilling a horizontal controlled borehole in the earth
US514888031 Aug 199022 Sep 1992The Charles Machine Works, Inc.Apparatus for drilling a horizontal controlled borehole in the earth
US524202625 Mar 19927 Sep 1993The Charles Machine Works, Inc.Method of and apparatus for drilling a horizontal controlled borehole in the earth
US534188725 May 199330 Aug 1994The Charles Machine Works, Inc.Directional multi-blade boring head
US579974027 Feb 19951 Sep 1998The Charles Machine Works, Inc.Directional boring head with blade assembly
US594132222 Jun 199824 Aug 1999The Charles Machine Works, Inc.Directional boring head with blade assembly
US639021121 Jun 199921 May 2002Baker Hughes IncorporatedVariable orientation nozzles for earth boring drill bits, drill bits so equipped, and methods of orienting
USRE3745019 Jan 200020 Nov 2001The Charles Machine Works, Inc.Directional multi-blade boring head
USRE3797525 Sep 20004 Feb 2003The Charles Machine Works, Inc.Directional boring head with blade assembly

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