US Patent No: 5,464,470
Number of patents in Portfolio can not be more than 2000
Color-changing marking composition system
Stats
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Nov 7, 1995
Issued date -
Feb 10, 1995
filing date -
08/386,695
serial no -
Expired
status
Importance
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Abstract
A color-changing marking composition system, suitable for use in the form of crayons and pencils, comprising a first marking composition comprising wax, a dye, which is other than a Leuco dye and which is capable of changing color upon contact with a color change-inducing compound, and a solvent capable of solubilizing the dye; and a second marking composition comprising wax and a color change-inducing compound, which is capable of inducing a color change in a dye in a marking composition with which it is brought in contact.
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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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| 4,193,906 Compositions for solid writing materials and writing implements | 23 | 1978 | |
| 4,212,676 Compositions for solid writing materials and writing implements | 27 | 1979 | |
| 4,256,494 Erasable ink composition for writing on an impervious surface | 44 | 1979 | |
| 4,604,139 Dual color ink composition | 26 | 1982 | |
| 4,460,727 Water base pigment ink composition for writing | 23 | 1982 | |
| 4,525,216 Ink composition | 34 | 1982 | |
| 4,490,177 Dual color ink composition | 29 | 1983 | |
| 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 | |
| 4,942,185 Water base pigment ink compositions for use in marking pens | 20 | 1989 | |
| 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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| 5,262,535 Surfactant composition and method of making the same | 21 | 1992 | |
| 5,232,494 Color changing compositions | 38 | 1992 | |
| 5,352,282 Color changing compositions | 23 | 1993 | |
| 5,326,388 Color changing compositions | 32 | 1993 | |
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| 4,213,717 Ball point pen, ink and its eradicator system | 38 | 1978 | |
| 4,227,930 Ball point pen, ink, and its eradicator system | 37 | 1978 | |
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| 5,017,226 Ink and method for the development of concealed images | 14 | 1988 | |
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| 4,744,826 Ink composition | 11 | 1986 | |
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| 4,262,935 Donor material for carbonless copying and coating composition for the same | 6 | 1978 | |
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| 4,681,471 Kit comprising multicolored fluid dispenser markers together with eradicating fluid dispenser, stamps and stamp pad | 35 | 1984 | |
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| 4,988,123 Erasable system including marking surface and erasable ink composition | 48 | 1988 | |
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| 5,222,823 Device for marking tickets for game of chance with translucent, vibrant colored ink | 44 | 1986 | |
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| 4,505,749 Method of forming color images | 26 | 1983 | |
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| 4,252,845 Graphic arts ink and eradicator combination | 36 | 1978 | |
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| 4,725,316 Color compositions and method | 16 | 1985 | |
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| 4,954,544 Modified adhesive composition which undergoes color changes upon application | 40 | 1989 | |
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| 2005/0185,915 Light guide plate with subwavelength grating and backlight module using the same | 2004 | ||
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| 5,118,350 Dye-set for improved color quality for ink-jet printers | 33 | 1991 | |
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| 4,428,994 Anti-graffiti facing of walls or similar surfaces | 18 | 1981 | |
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| 4,413,266 Method and apparatus for erasing ink jet printing | 26 | 1981 | |
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| 4,889,559 Latent ink | 10 | 1984 | |
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| 4,322,466 Sheet printed with invisible inks | 25 | 1978 | |
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| 5,279,859 Method for coloring fabric with crayon | 11 | 1992 | |
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| 5,043,013 Washable ink compositions | 52 | 1989 | |
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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 | 26 | 1990 | |
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| 5,006,171 Ink eradicator for inks containing triaryl methane dyestuffs | 30 | 1989 | |
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| 4,246,033 Arrangement for applying written or drawn information onto image carriers for overhead projection | 11 | 1977 | |
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| 4,557,618 Ink and eraser of the ink | 77 | 1982 | |
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| 5,024,699 Leuco dyes and recording materials using the same | 12 | 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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| 4,617,058 Process for producing blackboard crayon | 8 | 1985 | |
| 4,708,817 Creative art medium for forming artistic expressions having a latent luminescent image pattern | 23 | 1986 | |
| 4,741,774 Plastic colored crayon | 11 | 1986 | |
| 4,907,903 Representing utensil | 15 | 1988 | |
| 5,139,572 Reusable hidden indicia printed sheet | 78 | 1990 | |
| 5,215,956 Color changing print | 28 | 1991 | |
| 5,196,243 Printed matter | 18 | 1992 | |
| 5,324,348 Disposable orthodontic wire marker | 5 | 1993 | |