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Low toxicity oil-based drilling fluid
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Patent number 4,787,990
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Issue date Nov 29, 1988
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Conoco Inc.
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Phillip A. Boyd
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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Borehole drilling fluid and method
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Patent number 4,486,316
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Issue date Dec 4, 1984
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NL Industries, Inc.
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David B. Carriere
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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Patent number 4,396,734
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Issue date Aug 2, 1983
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GAF Corporation
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Earl P. Williams
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Water-based industrial fluids
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Patent number 4,257,902
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Issue date Mar 24, 1981
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Singer & Hersch Industrial Development (Pty.) Ltd.
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Haimi N. Singer
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E21 - EARTH DRILLING MINING
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3865736
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Patent number 3,865,736
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Issue date Feb 11, 1975
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E21 - EARTH DRILLING MINING
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3741895
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Patent number 3,741,895
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Issue date Jun 26, 1973
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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3716426
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Patent number 3,716,426
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Issue date Feb 13, 1973
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C06 - EXPLOSIVES MATCHES
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3515667
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Patent number 3,515,667
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Issue date Jun 2, 1970
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3371037
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Patent number 3,371,037
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E21 - EARTH DRILLING MINING
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3111491
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Patent number 3,111,491
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Issue date Nov 19, 1963
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2740758
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Patent number 2,740,758
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2698833
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Patent number 2,698,833
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2659046
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Patent number 2,659,046
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2195798
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2007465
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Patent number 2,007,465
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Issue date Jul 9, 1935
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E21 - EARTH DRILLING MINING