Bar codes using luminescent invisible inks

Details Bar codes using luminescent invisible inks Bar codes using luminescent invisible inks

1994-12-01

1996-08-06

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 21R, 106 21D, C09D 1102

Patent

active

055429718

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 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. This allows the lower layer and upper layer bar code to contain more information than conventional bar codes.

REFERENCES:
patent: 4572803 (1986-02-01), Yamazoe et al.
George Kallistratos "Fluorescent Properties of Aromatic Complexes with Rare Earths And Other Elements Of The III .alpha.-Group" May 24, 1982 Chimka Chronika, New Series 11, 249-266.
Ingmar Grenthe "Stability Relationships Among The Rare Earth Dipicolinates" Jan. 20, 1961.

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