Ink intrusion resistant digital code

Details Ink intrusion resistant digital code Ink intrusion resistant digital code

1991-12-16

1994-03-22

Shepperd, John

Registers

Records

Particular code pattern

235454, G06K 1906

Patent

active

052966933

ABSTRACT:
A two dimensional row and column based system for storing digital data is formatted on a suitable base medium such as paper sheet 10. The data format is formed by a plurality of data units 10U having L data entry locations 14. The data is contained in the selective presence or absence of recording ink within the locations. Each data unit extends R locations along the row axis and C locations along the column axis.
Any E entry locations of the L locations within the data unit are designated recording material present locations. The L-E remainder locations are designated recording material absent locations.
The number of codes C that may be represented by these E in L type data units is determined by the relationship:

REFERENCES:
patent: 3453419 (1969-07-01), Torrey
patent: 3673389 (1972-06-01), Kapsambelis
patent: 4114033 (1978-09-01), Okamoto
patent: 4286146 (1981-08-01), Uno et al.
patent: 4337375 (1982-06-01), Freeman
patent: 4488679 (1984-12-01), Bockholt et al.
patent: 4896029 (1990-01-01), Chandler et al.
patent: 5008950 (1991-04-01), Katayama et al.
J. D. Hall et al, IBM Technical Disclosure Bulletin vol. 24, No. 2, Jul. 1981, p. 1259.

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