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3577361
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Patent number 3,577,361
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Issue date May 4, 1971
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C07 - ORGANIC CHEMISTRY
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3272881
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Patent number 3,272,881
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Issue date Sep 13, 1966
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C07 - ORGANIC CHEMISTRY
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3057801
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Patent number 3,057,801
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Issue date Oct 9, 1962
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C07 - ORGANIC CHEMISTRY
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2999120
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Patent number 2,999,120
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Issue date Sep 5, 1961
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C07 - ORGANIC CHEMISTRY
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2956086
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Patent number 2,956,086
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Issue date Oct 11, 1960
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C07 - ORGANIC CHEMISTRY