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US 6,607,268 B2Granted
Inkjet inks which improve drop-velocity stability and prolong resistor life in inkjet pens
AssigneeHewlett-Packard Development Company, L.P.
InventorsPaul J. Bruinsma, Noah C. Lassar
Life of this patent
Estimating the term…
Abstract
An inkjet ink composition and a method of printing with the ink composition comprising at least one colorant and an aqueous vehicle comprising at least one metal salt or metal-organic complex that forms a film on the thermal inkjet resistor surface after repeated energizing of the resistor.
Claims28
Thermal inkjet ink comprising:
- at least one colorant;
- and
- an aqueous vehicle, the vehicle comprising
- aluminum ion in an amount sufficient, when the ink is used in an inkjet pen, to form a protective thin layer on an outer layer of a resistor surface of the inkjet pen, the outer layer comprising a refractory metal, a noble metal, a silicon composition or mixtures thereof.
1 more element
A method for inkjet printing, said method comprising the step of ejecting ink, said ink comprising:
- at least one colorant;
- and
- an aqueous vehicle, the vehicle comprising
- aluminum ion in an amount sufficient, when the ink is used in an inkjet pen, to form a protective thin layer on an outer layer of a resistor surface of the inkjet pen, the outer layer comprising a refractory metal, a noble metal, a silicon composition or mixtures thereof.
1 more element
Dependencies are inferred from the claim text.