US Patent No: 5,498,282
Number of patents in Portfolio can not be more than 2000
Color changing pan paint compositions
Stats
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Mar 12, 1996
Issued date -
Oct 3, 1994
filing date -
08/317,212
serial no -
In Force
status
Importance
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Abstract
Pan paints and associated color-changing systems are disclosed. In a first embodiment, the color-changing system comprises an undercolor pan paint coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 10 or greater and/or in the presence of a reducing agent; and an overcolor composition comprising a colorant capable of maintaining its characteristic color in the presence of a pH of about 10 or greater and/or in the presence of a reducing agent, and a base such that the pH of the overcolor composition is about 10 or greater and/or a reducing agent. In a second embodiment, the color-changing system comprises an undercolor coloring composition comprising an undercolor dye whose coloring ability is destroyed in the presence of a pH of about 4 or less; and an overcolor coloring composition comprising a colorant capable of maintaining its characteristic color in the presence of a pH of about 4 or less and an acid such that the pH of the overcolor coloring composition is about 4 or less; wherein one or both of the coloring compositions is a pan paint.
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First Claim
Related Publications
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International Classification(s)
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- [Patents Count]
Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,212,676 Compositions for solid writing materials and writing implements | 27 | 1979 | |
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| 4,525,216 Ink composition | 34 | 1982 | |
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| 4,525,215 Ink composition | 9 | 1984 | |
| 4,578,117 Erasable ink composition | 32 | 1984 | |
| 4,620,941 Thermochromic compositions | 28 | 1984 | |
| 4,954,174 Erasable ink compositions | 32 | 1988 | |
| 5,120,359 Erasable ink compositions | 38 | 1989 | |
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| 5,009,536 Water base pigment ink compositions for use in marking pens | 19 | 1990 | |
| 5,004,763 Water base erasable ink compositions | 43 | 1990 | |
| 5,106,881 Water base pigment ink compositions for use in marking pens | 20 | 1991 | |
| 5,176,746 Oil ink composition | 10 | 1991 | |
| 5,203,913 Erasable aqueous ink composition | 29 | 1991 | |
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| 5,326,388 Color changing compositions | 32 | 1993 | |
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| 5,196,237 Method for coloring fabric with crayon | 13 | 1991 | |
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| 5,302,194 Heat sensitive color developing material | 6 | 1991 | |
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| 5,082,386 Paper adhesive applicator with adhesive having pH indicator | 25 | 1990 | |
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| 4,352,691 Liquid ink for printers | 32 | 1980 | |
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| 4,732,614 Novel correction compositions and process for using same | 20 | 1985 | |
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| 4,525,214 Crayon adapted for development of latent images | 21 | 1983 | |
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| 5,325,282 Low voltage-to-high voltage converter | 20 | 1992 | |
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| 5,196,243 Printed matter | 18 | 1992 | |