Troy Group, Inc.

Hewlett-packard Company

Key Safety Systems, Inc.

John Cooper

Michael R Riley

Kevin L Heilman

Richard A Fotland

Nabil F Nasser

Robert A Moore

John M Burdock

Mutaz A Shkoukani

Robert J Sadenwater

Robert L Arwood

Jin Ho Jung

Walter R Green

Jean-Luc Blancou

Nabil Nasser

A system and method for printing documents that are difficult to forge and that are easy to visually verify are disclosed. The system includes a colorant for printing an image on a surface of a document and a dye for forming a latent version of the image underneath the surface and a substrate that includes a migration agent for facilitating the migration of the dye through at least a portion of the substrate. The migration-enhancing agent may be coated onto a portion of the substrate or embedded within the substrate.

System for producing secure toner-based images and methods of forming and using the same

A toner for printing documents that are difficult to forge and that are readily easy to visually verify and methods of using and forming the toner are disclosed. The toner includes a colorant for printing an image on a surface of a document and a dye for forming a latent version of the image underneath a surface of a substrate. An image formed using the toner of the invention is readily verified by comparing the colorant-formed image and the dye-formed image.

Toner for producing secure images and methods of forming and using the same

Imaging systems and methods are described. In one aspect, an ink layer having an electrorheological fluid composition including a suspension of colorant particles dispersed in an electrically insulating carrier fluid is formed on a surface of an electrically conducting substrate. A charge image is projected onto the ink layer to selectively form charge-stiffened regions adhering to the electrically conducting substrate and representing respective regions of the projected charge image. Non-charge-stiffened ink layer components are physically separated from the charge-stiffened regions.

Imaging systems and methods

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Dennis, MA, United States of America

John Cooper