Bar code scanner for reading a visible ink and a luminescent inv

Details Bar code scanner for reading a visible ink and a luminescent inv Bar code scanner for reading a visible ink and a luminescent inv

1994-12-01

1996-03-26

Fields, Carolyn E.

Radiant energy

Coded record and readers; invisible radiant energy type

235468, 235491, G06K 712, G06K 714

Patent

active

055023045

ABSTRACT:
A lower layer bar code is written on an object with a normal ink and an upper layer bar code is 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 level bar codes.

REFERENCES:
patent: 3500047 (1970-03-01), Berry
patent: 4572803 (1986-02-01), Yamazoe et al.
patent: 4983817 (1991-01-01), Dolash et al.
patent: 5367148 (1994-11-01), Storch et al.
patent: 5401960 (1995-03-01), Fisun et al.
Abstract of Japan Patent (JP 63-191,870) to Takuma et al., CA:Selects Coatings, Inks, & Related Products, No. 7, 1989, p. 17.
George Kallistratos "Fluorescent Properties of Aromatic Complexes with Rare Earths and Other Elements of the II a-Group" May 24, 1982 Chimka Chronika, New Series II 249-266.
Ingmar Grenthe "Stability Relationships Among the Rare Earth Dipicolinates" Jan. 20, 1961, vol. 83, pp. 360-364.

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