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US 7,094,278 B2Granted
Multi-color writing inks
AssigneeSanford, L.P.
InventorsVincent Kwan, Philip W. Ambler
Life of this patent
Estimating the term…
Abstract
The disclosure is generally related to a multi-color writing ink and, more particularly, to a multi-color writing instrument comprising a mixture of a first ink composition and a second ink composition, wherein the first and second ink compositions are immiscible with each other.
Claims38
A multi-color writing ink, consisting essentially of:
- a mixture of a first ink composition consisting essentially of a first solvent, a first dye, and optionally at least one ink additive, and a second ink composition consisting essentially of a second solvent, a second dye, and optionally at least one ink additive, wherein the first and second ink compositions are immiscible with each other, the first ink composition comprises at least about 0.1 weight percent of the first dye, and the second ink composition comprises at least about 0.1 weight percent of the second dye.
A multi-color marker, comprising:
- a fibrous ink reservoir containing at least a mixture of a first ink composition comprising a first solvent and a first colorant and a second ink composition comprising a second solvent and a second colorant;
- and,
- a fibrous nib in fluid communication with the fibrous ink reservoir, wherein the first and second ink compositions are immiscible with each other.
A multi-color writing ink, comprising:
- a mixture of a first ink composition comprising a first solvent and a first colorant and a second ink composition comprising a second solvent and a second colorant, wherein the first and second ink compositions are immiscible with each other, and the first solvent is water and the second solvent is dibasic ester solvent or the first solvent is dimethylformamide and the second solvent is diisopropylether.
Dependencies are inferred from the claim text.