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Ansamycin antibiotic
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Patent number 4,247,462
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Issue date Jan 27, 1981
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Pfizer Inc.
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Walter D. Celmer
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C07 - ORGANIC CHEMISTRY
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New polycyclic ether antibiotic
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Patent number 4,195,079
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Issue date Mar 25, 1980
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Pfizer Inc.
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Walter D. Celmer
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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Polycyclic ether antibiotic
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Patent number 4,062,945
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Issue date Dec 13, 1977
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Pfizer Inc.
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Walter D. Celmer
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Polycyclic ether antibiotic
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Patent number 4,022,885
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Issue date May 10, 1977
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Pfizer Inc.
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Walter D. Celmer
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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