Compositions: coating or plastic – Coating or plastic compositions – Marking
Reexamination Certificate
2004-10-28
2010-02-23
Lorengo, Jerry (Department: 1793)
Compositions: coating or plastic
Coating or plastic compositions
Marking
Reexamination Certificate
active
07666256
ABSTRACT:
Ink-jet ink sets, pigment-based ink formulations, methods of printing, and methods of enhancing print quality, are disclosed. One exemplary ink-jet ink set, among others, includes a pigment-based ink formulation at a first pH, including: a pigment, and an amphoteric dispersant having an isoelectric point; and a second ink formulation at a second pH, wherein the first pH and the second pH are each selected from an acidic pH and a basic pH, wherein the first pH and the second pH are not the same, and wherein the amphoteric dispersant has a higher isoelectric point than the first pH when the dispersant is acidic, and a lower isoelectric point than the first pH when the dispersant is basic.
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Faison Gee Veronica
Hewlett--Packard Development Company, L.P.
Lorengo Jerry
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