Dot matrix formed security fonts

Details Dot matrix formed security fonts Dot matrix formed security fonts

1988-05-11

1989-11-28

Sewell, Paul T.

Printed matter

Miscellaneous

340756, 400104, 400121, D18 24, 380 55, B42D 1500

Patent

active

048832910

ABSTRACT:
Fonts of characters of an alphabetic and numerical set thereof are described wherein each character of a set is formed from a dot-like pixel matrix and exhibits a predetermined constant and equal number of pixels. Any illegal alteration of the characters of the font set is avoided by forming the dot-like pixels defining a character in permanent fashion as by indentation in the surface of the article to be marked such that pixels cannot be erased, but only added. The pixels within the top and bottom three rows of each character of the font sets form a pattern unique to that character so that the identity of the character may be recovered if a portion of it is lost. A security encryption technique becomes available through the use of characters from two font formats.

REFERENCES:
patent: 2350893 (1944-06-01), Hofgaard
patent: 3044696 (1962-07-01), Feissel
patent: 3678497 (1972-07-01), Watson
patent: 4039066 (1977-08-01), Quigley
patent: 4218673 (1980-08-01), Yoshida
patent: 4506999 (1985-03-01), Robertson

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