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United States of America Patent
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Aug 18, 1992
Grant Date -
N/A
app pub date -
Jun 6, 1990
filing date -
Jun 20, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A print of this invention has a color-forming area and a discoloring area. The color-forming area is printed by an ink containing a first color-changing agent which changes from substantially invisible colorlessness to visibleness by applying a color former. The discoloring area is printed by an ink containing a second color-changing agent which changes a from substantially invisible colorlessness to visibleness by applying the color former and returns to invisible colorlessness state as the time passes naturally after changing its color.
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