|
| US4300636 | 7 Mar 1980 | 17 Nov 1981 | Dailey Oil Tools, Inc. | Constant bottom contact tool |
| US4319784 | 4 Jun 1980 | 16 Mar 1982 | Conzinc Riotinto Malaysia Sendirian Berhard | Apparatus for water jet and impact drilling and mining |
| US4361193 | 28 Nov 1980 | 30 Nov 1982 | Mobil Oil Corporation | Method and arrangement for improving cuttings removal and reducing differential pressure sticking of drill strings in wellbores |
| US4392527 | 3 Mar 1981 | 12 Jul 1983 | Hawk Industries, Inc. | Water well developing system |
| US4645006 | 7 Dec 1984 | 24 Feb 1987 | | Annulus access valve system |
| US6732793 | 26 Mar 2002 | 11 May 2004 | Drilling Systems International Ltd. | Downhole jetting tool |
| US6923255 | 2 Aug 2001 | 2 Aug 2005 | | Activating ball assembly for use with a by-pass tool in a drill string |
| US8210250 | 6 Oct 2011 | 3 Jul 2012 | Thru Tubing Solutions, Inc. | Methods and devices for one trip plugging and perforating of oil and gas wells |
