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3772412
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Patent number 3,772,412
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Issue date Nov 13, 1973
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C07 - ORGANIC CHEMISTRY
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3691077
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Patent number 3,691,077
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Issue date Sep 12, 1972
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C07 - ORGANIC CHEMISTRY
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3649722
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Patent number 3,649,722
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Issue date Mar 14, 1972
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C07 - ORGANIC CHEMISTRY
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3579449
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Patent number 3,579,449
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Issue date May 18, 1971
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C07 - ORGANIC CHEMISTRY