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US 4,284,774 AGranted
Sulfoarylated nigrosine dye and use in jet-printing inks
AssigneeAmerican Cyanamid Company
InventorBennett G. Buell
Life of this patent
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Abstract
Nigrosine base is aryl sulfonated to produce a dye useful in jet-printing inks.
Claims10
Nigrosine base aryl monosulfonate containing at least about 0.5 aryl monosulfonate groups of the structure --Ar--SO.sub.3 A wherein Ar is aryl and A is hydrogen or alkali metal per effective formula weight of nigrosine base.
Dependencies are inferred from the claim text.