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Dye couplers
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Patent number 5,073,173
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Issue date Dec 17, 1991
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Clairol Incorporated
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Yuh-Guo Pan
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C07 - ORGANIC CHEMISTRY
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3905825
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Patent number 3,905,825
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Issue date Sep 16, 1975
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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3729458
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Patent number 3,729,458
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Issue date Apr 24, 1973
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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3562246
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Patent number 3,562,246
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Issue date Feb 9, 1971
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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3539348
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Patent number 3,539,348
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Issue date Nov 10, 1970
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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3502644
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Patent number 3,502,644
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Issue date Mar 24, 1970
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
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2357977
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Patent number 2,357,977
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Issue date Sep 12, 1944
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C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...