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US 8,865,621 B2Granted
Irreversible color changing ink compositions
AssigneeSanford, L.P.
InventorWing Sum Vincent Kwan
Life of this patent
Estimating the term…
Abstract
The disclosure is generally related to an irreversible thermochromic ink composition and, more particularly, to an irreversible thermochromic ink composition comprising a carrier and thermochromic capsules, the thermochromic capsules comprising a shell and a core, the core comprising an eradicable dye capable of becoming substantially colorless and/or of changing color from a first colored state to a second colored state when exposed to an eradicator.
Claims22
An irreversible color-changing ink comprising:
- a carrier and color-changing capsules dispersed in the carrier, the color-changing capsules comprising a shell and a core, the core comprising an eradicable dye capable of becoming substantially colorless and/or of changing color from a first colored state to a second colored state, wherein the carrier comprises an eradicator.
A writing instrument comprising:
- a writing point in fluid communication with an ink reservoir, wherein the ink reservoir contains an irreversible color-changing ink composition comprising a carrier and color-changing capsules dispersed in the carrier, the color-changing capsules comprising a shell and a core, the core comprising an eradicable dye capable of becoming substantially colorless and/or of changing color from a first colored state to a second colored state.
A method of irreversibly eradicating a written mark, comprising:
- forming an eradicable written mark by applying an irreversible color-changing ink to a substrate, wherein the irreversible color-changing ink comprises a carrier and color-changing capsules dispersed in the carrier, the color-changing capsules comprising a shell and a core, the core comprising an eradicable dye capable of becoming substantially colorless and/or of changing color from a first colored state to a second colored state, and the carrier comprising an eradicator;
- and
- applying a force directing component to the written mark thereby rupturing a portion of the color-changing capsules causing the eradicable dye to react with the eradicator thereby eradicating the written mark.
Dependencies are inferred from the claim text.