Method for distinguishing printed originals from copies
First Claim
Patent Images
1. Method for making printed originals distinguishable from copies, which comprises:
- (a) using an ink ribbon as a printing medium for printing originals;
(b) adding a substance to the ink ribbon in the form of a marking;
(c) printing an original with the marked ink ribbon for producing invisible distinguishable markings in the printed original being recognizable solely by means of special scanners.
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Abstract
In order to distinguish originals from copies, a method adds substances to printing medium that produces markings, which are not visible to the naked eye and are only recognizable by using special scanners.
25 Citations
8 Claims
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1. Method for making printed originals distinguishable from copies, which comprises:
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(a) using an ink ribbon as a printing medium for printing originals; (b) adding a substance to the ink ribbon in the form of a marking; (c) printing an original with the marked ink ribbon for producing invisible distinguishable markings in the printed original being recognizable solely by means of special scanners. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification