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US Patent 7806969 Black inkjet ink

Patent 7806969 was granted and assigned to E.I. Du Pont De Nemours And Company on October, 2010 by the United States Patent and Trademark Office.

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Patent abstract

The present invention pertains to an aqueous-based black inkjet ink comprising a mixture of Direct Black 168, Acid Blue 290 and a certain magenta dye. The ink exhibits good color neutrality and gray scale.

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