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| US5436227 | 27 May 1993 | 25 Jul 1995 | Shell Oil Company | Soluble/insoluble alcohol in drilling fluid |
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| US6267812 | 15 Apr 1999 | 31 Jul 2001 | Roquette Freres Lestrem | Aqueous dispersion of pigment(s) and/or filler(s) containing a particular saccharide composition |
| US8071509 | 26 Nov 2008 | 6 Dec 2011 | Engineered Drilling Solutions Inc. | Glycerol based drilling fluids |
