Browse Prior Art Database

Safety Paper

IP.com Disclosure Number: IPCOM000078926D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Godlewski, RB: AUTHOR

Abstract

A multiply safety paper for checks, stock certificates, licenses, etc. is provided, in which any attempt to alter critical indicia can readily be detected.

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Safety Paper

A multiply safety paper for checks, stock certificates, licenses, etc. is provided, in which any attempt to alter critical indicia can readily be detected.

This safety paper comprises ply 1 of lightweight translucent bond paper and ply 2, which is a conventional so-called self-contained carbonless sheet (such as 3M* Action 100 paper). If required for opacity and/or thickness, a ply 3 is included. These plies 1, 2 or 1, 2, 3 are bonded into a laminate using an adhesive that will defeat any attempted delamination.

Before lamination, desired background indicia (such as company name, crest, symbols, instructions) may be printed by a conventional printing press on what will become the upper surface of ply 1 and/or 3. After lamination, distinctive indicia (such as name, address, signature) is applied to the upper surface of ply 1 by application of localized pressure through an appropriate stylus (such as a pen, pencil, typewriter key, or high-speed print hammer). As the image is thus formed on the exposed upper surface of ply 1, an identical image will be formed on the inaccessible yet visible upper surface of ply 2 by the reaction of the coreactants in the carbonless coating. Even if the image on upper ply 1 is altered, it is impossible to alter the image on ply 2 without destroying the document.

If preferred, the coreactants of the carbonless system may be applied to adjacent surfaces (such as the under side of ply 1 and upper side of ply 2) instead of b...