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3230216
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Patent number 3,230,216
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Issue date Jan 18, 1966
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C07 - ORGANIC CHEMISTRY
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2302468
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Patent number 2,302,468
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Issue date Nov 17, 1942
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C07 - ORGANIC CHEMISTRY
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2302467
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Patent number 2,302,467
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Issue date Nov 17, 1942
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C07 - ORGANIC CHEMISTRY
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2302463
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Patent number 2,302,463
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Issue date Nov 17, 1942
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C07 - ORGANIC CHEMISTRY