Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing chemical
Patent
1993-06-14
1995-03-28
Vo, Peter Dungba
Printed matter
Having revealable concealed information, fraud preventer or...
Utilizing chemical
283 57, 283 94, 283114, 427145, 428199, 4283215, B42D 1510, B41M 528, B32B 316
Patent
active
054010608
ABSTRACT:
A pressure and heat-sensitive composition comprising chromogen-containing pressure-rupturable microcapsules and heat-sensitive color developer useful for verification of document authenticity system when applied as a localized coating on documents, such as checks and prescriptions. Quickly striking the chromogenic composition with a fingernail or blunt object to generate pressure and heat in the coating produces a colored image by friction. The chromogenic composition possesses a fugitive characteristic, whereby the colored image gradually disappears and can be made to reappear when the chromogenic coating is again subjected to external pressure and heat. This feature can be used for repeated verification of the authenticity of the document.
REFERENCES:
patent: 2929736 (1960-03-01), Miller et al.
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: 4140733 (1979-02-01), Meyer, Jr. et al.
patent: 4175774 (1979-11-01), Tonges et al.
patent: 4183989 (1980-01-01), Tooth
patent: 4186020 (1980-01-01), Wachtel
patent: 4197346 (1980-04-01), Steven
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: 4425386 (1984-01-01), Chang
patent: 4726608 (1988-02-01), Walton
patent: 4839396 (1989-06-01), Tusim
patent: 4846502 (1989-07-01), Chang et al.
patent: 4873219 (1989-10-01), Brown et al.
patent: 5132034 (1992-07-01), Hsu et al.
patent: 5212219 (1993-05-01), Griffin
Research Disclosure (No. 187), Nov. 1979, pp. 638-639.
Chang John C. H.
Johnson Richard H.
Dungba Vo Peter
Wallace Computer Services Inc.
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