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Hide-curing additive
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Patent number 6,451,062
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Issue date Sep 17, 2002
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Birko Corporation
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Dana J. Johnson
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C14 - SKINS HIDES PELTS LEATHER
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Waste water treatment
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Patent number 4,744,903
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Issue date May 17, 1988
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Birko Corporation
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Terry L. McAninch
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Waste water treatment
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Patent number 4,744,904
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Issue date May 17, 1988
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Birko Corporation
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Terry L. McAninch
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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