Method and apparatus for coding heat sensitive media
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United States of America Patent
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Sep 18, 1990
Issued Date -
N/A
app pub date -
Aug 1, 1988
filing date -
Sep 14, 1984
priority date (Note) -
Expired
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Abstract
A method of coding an optically-readable medium comprises: applying to the medium at least one coating of a heat-sensitive material to produce a specified combination of at least two optical changes as a function of time when heated to a predetermined temperature above ambient; heating the medium to the predetermined temperature; and sensing the optical changes undergone by the medium to determine whether the sensed changes match the specified combination. The method and apparatus are described particularly to an optically-readable medium wherein the heat-sensitive coating is in a plurality of windows formed in the medium, each window signifying a value element.
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