Printed matter – Having revealable concealed information – fraud preventer or...
Patent
1992-12-09
1994-09-06
Bell, Paul A.
Printed matter
Having revealable concealed information, fraud preventer or...
283 87, 283 94, 283904, B42D 1500
Patent
active
053441915
ABSTRACT:
A hidden entry system comprises a document having a localized coating of a non-pressure sensitive heat activated autogenous chromogenic composition to provide a latent image which reveals hidden indicia when heated at moderate temperatures. The hidden entry system is especially useful for contests and promotional forms. Quickly striking the chromogenic composition with a fingernail or blunt object converts the latent image to a visible colored image by frictional heat. The chromogenic composition contains a chromogenic compound and a color developer which are non-pressure sensitive and non-reactive at room temperature. The latent image can be provided by an intimate mixture of the chromogenic compound and the developer or alternatively, one component can be printed on a separate layer or coating of the other component.
REFERENCES:
patent: 3713861 (1973-01-01), Sharp
patent: 3829133 (1974-08-01), Smagala-Romanoff
patent: 4037007 (1977-07-01), Wood
patent: 4109047 (1978-08-01), Fredrickson
patent: 4175774 (1979-11-01), Tonges et al.
patent: 4183989 (1980-01-01), Tooth
patent: 4186020 (1980-01-01), Wachtel
patent: 4210346 (1980-07-01), Mowry, Jr. et al.
patent: 4303307 (1981-12-01), Tureck et al.
patent: 4360548 (1982-11-01), Skees et al.
patent: 4376887 (1983-03-01), Greenaway et al.
patent: 4488646 (1984-12-01), McCorkle
patent: 4505498 (1985-03-01), Weinberger
patent: 4726608 (1988-02-01), Walton
patent: 4846502 (1989-07-01), Chang et al.
patent: 5193854 (1993-03-01), Borowski, Jr. et al.
Chang John C. H.
Walter Peter A.
Bell Paul A.
Wallace Computer Services Inc.
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