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3810936
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Patent number 3,810,936
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Issue date May 14, 1974
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C07 - ORGANIC CHEMISTRY
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3644342
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Patent number 3,644,342
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Issue date Feb 22, 1972
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C07 - ORGANIC CHEMISTRY
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3549663
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Patent number 3,549,663
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Issue date Dec 22, 1970
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C07 - ORGANIC CHEMISTRY
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2615041
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Patent number 2,615,041
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Issue date Oct 21, 1952
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C07 - ORGANIC CHEMISTRY