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3686253
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Patent number 3,686,253
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Issue date Aug 22, 1972
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C07 - ORGANIC CHEMISTRY
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3646090
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Patent number 3,646,090
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Issue date Feb 29, 1972
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C07 - ORGANIC CHEMISTRY
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3162662
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Patent number 3,162,662
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Issue date Dec 22, 1964
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C07 - ORGANIC CHEMISTRY
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3101361
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Patent number 3,101,361
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Issue date Aug 20, 1963
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C07 - ORGANIC CHEMISTRY