초록 ▼

A tamper evident document comprising a support bearing an autogenous coating including chromogenic material isolated from an electron-acceptor color developer material in which the autogenous coating bears a principal image comprising visible indicia of a transfer medium imprinted on the surface of

A tamper evident document comprising a support bearing an autogenous coating including chromogenic material isolated from an electron-acceptor color developer material in which the autogenous coating bears a principal image comprising visible indicia of a transfer medium imprinted on the surface of the localized autogenous coating. Tampering with the principal image causes chromogen to react with the electron-acceptor color developer material to provide a color indication of tampering. The tamper evident document can be part of a multi-ply record system comprising a plurality of sheets in superposed relationship, comprising a first sheet including a support bearing an autogenous coating including chromogenic material isolated from an electron-acceptor color developer material, said localized autogenous coating bearing a principle image comprising invisible indicia of a transfer medium imprinted on the surface of said localized autogenous coating, and a second sheet including a support bearing a coating of a transfer medium on the first side of said support, said second sheet being positioned adjacent said first sheet with said first side adjacent and in superposed relationship to said autogenous coating such that when pressure is applied to the second side of said second sheet transfer medium in the form of visible indicia is imprinted onto said autogenous coating, wherein tampering with said principal image causes chromogen to contact with said electron-acceptor color developer material to provide a color indication of tampering.

대표청구항 ▼

A tamper evident document comprising a support bearing an information area comprising a first layer consisting essentially of chromogenic material and a second layer consisting essentially of an electron-acceptor color developer material, said first and second layers being in a superimposed relation

A tamper evident document comprising a support bearing an information area comprising a first layer consisting essentially of chromogenic material and a second layer consisting essentially of an electron-acceptor color developer material, said first and second layers being in a superimposed relationship; said information area bearing a visible principal image subject to alteration imprinted in the information area, said first and second layers being non-coextensive and the less extensive layer comprising a latent image of an alerting message non-coextensive with said visible principal image, said latent image being discontinuous under said visible principal image; such that tampering with said principal image causes chromogen to contact said electron-acceptor color developer material, which in turn, causes latent image to become a visible, alerting message indicative of tampering.