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Synthetic melanin
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Patent number 5,227,459
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Issue date Jul 13, 1993
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Yale University
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John Pawelek
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3908021
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Patent number 3,908,021
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Issue date Sep 23, 1975
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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3214294
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Patent number 3,214,294
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Issue date Oct 26, 1965
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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3113029
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Patent number 3,113,029
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Issue date Dec 3, 1963
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C12 - BIOCHEMISTRY BEER SPIRITS WINE VINEGAR MICROBIOLOGY ENZYMOLOGY MUTATION...
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1418945
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Patent number 1,418,945
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Issue date Jun 6, 1922
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C12 - BIOCHEMISTRY BEER SPIRITS WINE VINEGAR MICROBIOLOGY ENZYMOLOGY MUTATION...