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US Patent 8041645 Document security utilizing color gradients

Patent 8041645 was granted and assigned to Pitney Bowes on October, 2011 by the United States Patent and Trademark Office.

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Patent abstract

The present invention includes apparatus and methods for printing and verifying postage stamps on demand via a personal postage stamp printer. The indicium by which the stamp is printed includes a color stripe and a data field including authentication data that corresponds to the color stripe. To authenticate the stamp, the authentication data in the data field is read and compared with authentication data extracted from the color stripe.

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