Method for formation of invisible marking and method for reading

Details Method for formation of invisible marking and method for reading Method for formation of invisible marking and method for reading

1995-05-05

1996-08-20

Klemanski, Helene

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 21A, 106 21E, C09D 1102

Patent

active

055475019

ABSTRACT:
Information is printed on the surface of a substrate with a marking ink containing a mixture of an indium-tin mixed oxide and at least one compound selected from the group consisting of alumina, barium sulfate, silicon dioxide and calcium carbonate, to prepare an invisible marking-printed material; and infrared rays of 2-10 .mu.m wavelength are applied onto the invisible marking-printed material to measure the infrared absorptivities of the invisible marking area and other area of said material and identify the information signified by the invisible marking.

REFERENCES:
patent: 4029506 (1977-06-01), Dessauer
patent: 5286286 (1994-02-01), Winnik et al.
patent: 5460646 (1995-10-01), Lazzouni et al.
patent: 5478381 (1995-12-01), Ohiwa et al.
"IR-RAY Absorbing Printing Ink For Invisible Bar Code Printings", Database WPI, Week 9420, Apr. 19, 1994, Derwent Publications Ltd., London, Great Britain, AN 164182, and JP-A-6 107 985.

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