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3408381
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Patent number 3,408,381
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Issue date Oct 29, 1968
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C07 - ORGANIC CHEMISTRY
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3280199
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Patent number 3,280,199
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Issue date Oct 18, 1966
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C07 - ORGANIC CHEMISTRY
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2818440
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Patent number 2,818,440
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Issue date Dec 31, 1957
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C07 - ORGANIC CHEMISTRY
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2753380
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Patent number 2,753,380
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Issue date Jul 3, 1956
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C07 - ORGANIC CHEMISTRY