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3767694
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Patent number 3,767,694
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Issue date Oct 23, 1973
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C07 - ORGANIC CHEMISTRY
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3711538
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Patent number 3,711,538
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Issue date Jan 16, 1973
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C07 - ORGANIC CHEMISTRY
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3639666
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Patent number 3,639,666
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Issue date Feb 1, 1972
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C07 - ORGANIC CHEMISTRY
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3624126
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Patent number 3,624,126
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Issue date Nov 30, 1971
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C07 - ORGANIC CHEMISTRY
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3322752
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Patent number 3,322,752
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Issue date May 30, 1967
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C07 - ORGANIC CHEMISTRY