| Title of Invention | INK-JET PRINTING SYSTEM FOR IMPROVED PRINT QUALITY |
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| Abstract | An ink-jet printing system is disclosed comprising a set of ink-jet inks comprising a first anionic ink comprising an aqueous vehicle, at least one first colorant, and at least one first anionic polymer; a second anionic ink comprising an aqueous vehicle; at least one second colorant, at least one second anionic polymer, and an acid additive having a pKa up to the pKa of the at least first polymer of the first ink; a third cationic ink comprising an aqueous vehicle, at least one third colorant, at least one third cationic polymer, and a pH in the range from about 2 to about 5; and a fourth anionic ink comprising an aqueous vehicle, at least one fourth anionic dye, and a precipitating agent. The printing system provides improved print quality, specifically, reduced bleed; improved edge-acuity, uniform area fills, and color quality; while maximizing lightfastness without sacrificing printing reliability. |
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145-CAL-1999-(22-03-2012)-CORRESPONDENCE.pdf
145-CAL-1999-(22-03-2012)-PA-CERTIFIED COPIES.pdf
145-cal-1999-granted-abstract.pdf
145-cal-1999-granted-claims.pdf
145-cal-1999-granted-correspondence.pdf
145-cal-1999-granted-description (complete).pdf
145-cal-1999-granted-drawings.pdf
145-cal-1999-granted-examination report.pdf
145-cal-1999-granted-form 1.pdf
145-cal-1999-granted-form 13.pdf
145-cal-1999-granted-form 18.pdf
145-cal-1999-granted-form 2.pdf
145-cal-1999-granted-form 3.pdf
145-cal-1999-granted-form 5.pdf
145-cal-1999-granted-form 6.pdf
145-cal-1999-granted-letter patent.pdf
145-cal-1999-granted-reply to examination report.pdf
145-cal-1999-granted-specification.pdf
145-cal-1999-granted-translated copy of priority document.pdf
| Patent Number | 221003 | |||||||||
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| Indian Patent Application Number | 145/CAL/1999 | |||||||||
| PG Journal Number | 24/2008 | |||||||||
| Publication Date | 13-Jun-2008 | |||||||||
| Grant Date | 11-Jun-2008 | |||||||||
| Date of Filing | 24-Feb-1999 | |||||||||
| Name of Patentee | HEWLETT-PACKARD COMPANY | |||||||||
| Applicant Address | 3000 HANAOVER STREET, PALO ALTO, CALIFORNIA 94304 | |||||||||
Inventors:
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| PCT International Classification Number | B41J 2/195 | |||||||||
| PCT International Application Number | N/A | |||||||||
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PCT Conventions:
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