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3538217
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Patent number 3,538,217
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Issue date Nov 3, 1970
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C07 - ORGANIC CHEMISTRY
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3493607
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Patent number 3,493,607
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Issue date Feb 3, 1970
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C07 - ORGANIC CHEMISTRY
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3190906
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Patent number 3,190,906
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Issue date Jun 22, 1965
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C07 - ORGANIC CHEMISTRY
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1929079
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Patent number 1,929,079
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Issue date Oct 3, 1933
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C07 - ORGANIC CHEMISTRY