Security document verification system with pressure-rupturable m

Details Security document verification system with pressure-rupturable m Security document verification system with pressure-rupturable m

1993-06-14

1995-03-07

Vo, Peter Dungba

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing chemical

283 58, 283114, B42D 1510, B44F 112

Patent

active

053951387

ABSTRACT:
A pressure-sensitive, laser printer heat-resistant verification system for preventing unauthorized photoduplication of security documents comprising a support bearing an information area comprising a visible principal image, and a verification area comprising a localized, autogenous coating of a pressure-sensitive chromogenic composition for producing a visible colored image by external pressure. The chromogenic composition comprises (a) pressure-rupturable microcapsules containing a chromogen and (b) a color developer capable of reacting with the chromogen to form a visible image. The pressure-rupturable microcapsules and color developer are substantially coextensive on the support, and the verification area is spaced apart from the information area.

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Research Disclosure (No. 18747), Nov. 1979, pp. 638-639.

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