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Composition for H.sub.2 S removal
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Patent number 5,149,460
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Issue date Sep 22, 1992
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Shell Oil Company
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Donald C. Olson
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Method for drilling wells
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Patent number 5,083,622
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Issue date Jan 28, 1992
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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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Drilling fluids
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Patent number 5,076,373
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Issue date Dec 31, 1991
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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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Gas hydrate inhibition
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Patent number 5,076,364
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Issue date Dec 31, 1991
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Shell Oil Company
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Arthur H. Hale
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E21 - EARTH DRILLING MINING
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Alcohol-in-oil drilling fluid system
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Patent number 5,072,794
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Issue date Dec 17, 1991
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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...