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Drilling fluids
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Patent number 4,604,216
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Issue date Aug 5, 1986
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Phillips Petroleum Company
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Howard B. Irvin
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E21 - EARTH DRILLING MINING
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Drilling fluids
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Patent number 4,548,982
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Issue date Oct 22, 1985
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Phillips Petroleum Company
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Earl Clark
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Solvent purification
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Patent number 4,418,191
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Issue date Nov 29, 1983
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Phillips Petroleum Company
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Howard B. Irvin
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Polymer solution purification
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Patent number 4,278,506
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Issue date Jul 14, 1981
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Phillips Petroleum Company
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Howard B. Irvin
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Polyolefin reactor system
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Patent number 4,121,029
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Issue date Oct 17, 1978
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Phillips Petroleum Company
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Howard B. Irvin
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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