Document authentification paper
AssigneePortals Limited
InventorWilliam Albert Wood
Life of this patent
Estimating the term…
Abstract
Paper for use in the production of security documents incorporates planchettes which have incorporated therein or applied thereto a substance which is capable of taking part in a color-forming reaction. A second substance which is capable of taking part in a different color-forming reaction may be incorporated in other planchettes. When a reagent or reagents is or are applied to the security document to verify the authenticity of the document the substances change color by the color-forming reactions. Examples of security documents which may be made from such paper are bank cheques, travellers' cheques and other negotiable documents convertible to cash.
Claims15
Paper for use in the production of security documents by printing thereon, which paper incorporates planchettes, said planchettes having incorporated therein or applied thereto a substance which is capable of taking part in a color-forming reaction whereby, when a security document produced from said paper is verified by the application of a reagent or reagents, the said substance changes color by the color-forming reaction, and wherein said paper may additionally comprise one or more substances capable of taking part in a color-forming reaction, said substance not being incorporated in said planchettes.
A security document which comprises printed paper which paper incorporates planchettes, said planchettes having incorporated therein or applied thereto a substance which is capable of taking part in a color-forming reaction whereby, when a security document produced from said paper is verified by the application of a reagent or reagents, the said substance changes color by the color-forming reaction, and wherein said paper may additionally comprise one or more substances capable of taking part in a color-forming reaction, said substance not being incorporated in said planchettes.
A security document which comprises printed paper which paper incorporates planchettes wherein the planchettes are a mixture of planchettes having a first substance which is capable of taking part in a color-forming reaction incorporated therein or applied thereto and other planchettes having a second substance which is capable of taking part in a different color-forming reaction whereby when verification of the security document is effected by the application of a reagent or reagents, the said first and second substances change color by the color-forming reactions, and wherein said paper may additionally comprise one or more substances capable of taking part in a color-forming reaction, said substance not being incorporated in said planchettes.
Dependencies are inferred from the claim text.