Radiant energy – Coded record and readers; invisible radiant energy type
Patent
1994-12-01
1996-06-11
Fields, Carolyn E.
Radiant energy
Coded record and readers; invisible radiant energy type
235468, 235469, 235491, G06K 712, G06K 710
Patent
active
055257984
ABSTRACT:
Inks have been discovered that are selectively excitable by different wavelengths of incident radiation. This allows a lower layer bar code to be written on an object with an invisible ink and an upper layer bar code to be written over the lower layer bar code with an ink that is invisible to the naked eye. The apparatus of this invention is a detector that is able to read the upper and lower layer bar codes.
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Auslander Judith D.
Berson William
Fields Carolyn E.
Glick Edward J.
Pitney Bowes Inc.
Reichman Ronald
Scolnick Melvin J.
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