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Solidification of water based muds
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Patent number 5,673,753
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Issue date Oct 7, 1997
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Shell Oil Company
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Arthur Herman Hale
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Glycoside-in-oil drilling fluid system
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Patent number 5,494,120
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Issue date Feb 27, 1996
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Shell Oil Company
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Arthur H. Hale
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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Solidification of water based muds
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Patent number 5,423,379
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Issue date Jun 13, 1995
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Shell Oil Company
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Arthur H. Hale
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Anchor plug for open hole test tools
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Patent number 5,343,947
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Issue date Sep 6, 1994
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Shell Oil Company
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Kenneth M. Cowan
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Cement plug for well abandonment
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Patent number 5,343,952
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Issue date Sep 6, 1994
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Shell Oil Company
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Kenneth M. Cowan
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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