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Tinting hydrogel materials with vat dyes
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Patent number 5,534,038
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Issue date Jul 9, 1996
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Pilkington Barnes Hind, Inc.
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John M. Evans
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D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
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Opaque tinting process for contact lens
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Patent number 4,634,449
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Issue date Jan 6, 1987
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International Hydron Corporation
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Evan J. Jenkins
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D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
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3927973
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Patent number 3,927,973
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Issue date Dec 23, 1975
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D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...