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3843554
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Issue date Oct 22, 1974
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C07 - ORGANIC CHEMISTRY
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3201355
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Patent number 3,201,355
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Issue date Aug 17, 1965
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2810698
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Patent number 2,810,698
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Issue date Oct 22, 1957
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2724703
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Patent number 2,724,703
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Issue date Nov 22, 1955
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL