Liquid ink
AssigneeBerol Corporation
InventorsNan-Jae Lin, Andrew R. Klassman, Roy Nicoll, Charles Christopher Packham, Vliet Hulse, John Thompson
Life of this patent
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Abstract
A non-erasable liquid ink for a marking instrument including a colorant and a solvent and having a water content of about 0-15% by weight and a viscosity of about 15 to 4,500 cps. Also disclosed is a marking instrument filled with an ink of such a viscosity or lower in its reservoir.
Claims9
A marking instrument which comprises a body, a reservoir chamber within said body, and a non-erasable liquid ink in said chamber, said ink comprising a colorant, a solvent, and one or more polymers with number average molecular weights ranging from about 1×104 to 1×106 daltons said ink having a viscosity of from about 15 to 4,500 cps and a water content of less than 15% by weight.
Dependencies are inferred from the claim text.