Cryptography – Electric signal modification – Having production of printed copy
Patent
1990-05-29
1991-07-09
Tarcza, Thomas H.
Cryptography
Electric signal modification
Having production of printed copy
380 30, 380 54, H04L 900
Patent
active
050312154
ABSTRACT:
An item bearing an indicia which verifies a status of the item and a method and apparatus for applying such indicia. The indicia represents an encrypted message and has the form of a number n base N number system represented by characters selected from an unambiguous machine-readable character set having n characters. The characters consist of connected graphs drawn on a predetermined grid and meeting certain selected requirements. A set of descripters is selected, including a number of type 1 and type 3 points in a character and a subset of characters is selected from the set of all possible characters meeting the requirements so that each character is unambiguously described in terms of the selected descripters. In one embodiment disclosed the item is a mail piece and the status is the payment of postage.
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patent: 1021189 (1912-03-01), Hill
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patent: 3890596 (1975-06-01), Beun et al.
patent: 4637051 (1987-01-01), Clark
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patent: 4949381 (1990-08-01), Pastor
U.S. application Ser. No. 924,473 by Jose Pastor et al., filed: Oct. 29, 1986.
Cain David
Pitchenik David E.
Scolnick Melvin J.
Tarcza Thomas H.
Whisker Robert H.
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