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Applying Safety Features and Custom Watermarks

IP.com Disclosure Number: IPCOM000076359D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Connelly, JF: AUTHOR

Abstract

A safety feature, imitation watermark, invisible identification mark or similar unique background image is printed on a web by a dry offset or wet offset rotary press in line with printing of a conventional format, to obviate the need for printing of checks, licenses, etc. on special, relatively expensive safety papers.

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Applying Safety Features and Custom Watermarks

A safety feature, imitation watermark, invisible identification mark or similar unique background image is printed on a web by a dry offset or wet offset rotary press in line with printing of a conventional format, to obviate the need for printing of checks, licenses, etc. on special, relatively expensive safety papers.

The desired safety background image is printed from either metal type or raised polymer or rubber characters that are provided on one of the cylinders in a rotary web press and inked from a separate cylinder, having either a urethane or felt surface. This surface is impregnated with a safety ink comprising CLOROSTAIN* dyes and/or fluorescent dyes that are alcohol soluble to assure rapid drying. The color, coating thickness and degree of penetration of these inks is preferably such that the ink will be effectively removed and expose a differently colored background if any attempt is made to erase or eradicate a printed character, such as the amount of a check.

To apply a custom watermark, the urethane or felt surface is suitably impregnated from a reservoir with a suitable oil mixed with ethyl cellulose, cellulose acetate, and/or glycerine for transfer to the web. The surface may be impregnated with an ink that is invisible, when dried, to apply some distinguishing number or character for subsequent verification of authenticity of the document. In either event, the imprinted safety image, as well as th...