Writing instruments with eradicable inks and eradicating fluids
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United States of America Patent
Stats
-
Nov 18, 2008
Grant Date -
Oct 4, 2007
app pub date -
Jun 11, 2007
filing date -
Jan 14, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Improved eradicating fluids and eradicable inks are disclosed. A color changing eradicating fluid is disclosed which includes a volatile base, a pH sensitive dye and an eradicating agent whereby the dye changes color as the volatile base evaporates thereby provided a visual indication to the user when the eradicating fluid is sufficiently dry and ready to receive a corrected marking. A non-color changing eradicating fluid having a more moderate pH is also disclosed. The combination eradicable and re-write ink is disclosed which features phosphoric acid (or phosphorus pentoxide in solution) along with an eradicable dye. A combination writing and correction instrument that combines a disclosed eradicating fluid and a combination eradicable and re-write ink is also disclosed.
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