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US 6,599,353 B2Granted
Shear-thinning writing compositions, writing instruments, and methods
AssigneeBerol Corporation
InventorsJean L. Spencer, Pawel Czubarow
Life of this patent
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Abstract
An erasable, shear-thinning writing composition includes a shear-thinning additive and graphite particles dispersed within an aqueous solvent system.
Claims47
An erasable, shear-thinning writing composition comprising:
- a shear-thinning additive and
- graphite particles having a flake morphology in a liquid.
An erasable, shear-thinning writing composition, the composition comprising:
- a shear-thinning additive;
- and,
- graphite particles having a flake morphology dispersed in a liquid, wherein the composition has a shear-thinning index between about 0.01 and about 0.8.
A writing instrument comprising:
- a reservoir containing an erasable, shear-thinning writing composition comprising an aqueous solvent system, a shear-thinning additive, and graphite particles having a flake morphology, wherein the graphite particles and the shear-thinning additive are dispersed within the aqueous solvent system;
- and,
- a writing point in fluid communication with the reservoir.
A method of forming a marking, comprising:
- making a marking on a substrate with an erasable, shear-thinning writing composition comprising a shear-thinning additive and graphite particles having a flake morphology.
Dependencies are inferred from the claim text.