Optically scanned document with fail-safe marking

Details Optically scanned document with fail-safe marking Optically scanned document with fail-safe marking

1988-03-02

1991-03-19

Trafton, David L.

Registers

Coded record sensors

Readout control

235454, 235494, 283 72, G06K 700

Patent

active

050013300

ABSTRACT:
A data processing form used with photosensing apparatus that senses the presence of indicia in indicia-receiving locations on the form comprises a sheet of paper or like material. The form has a first control mark column containing a plurality of control marks in specified relation to a plurality of indicia-receiving locations on a first surface of said sheet. On the second surface of the sheet is a fail-safe mark opposite to and aligned with the first control mark column. The fail-safe mark has a continuous extend sufficient to connect at least two adjacent marks on said first surface, were such control marks on the second surface of said sheet in a location immediately opposite their location on said first surface.

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patent: 4430563 (1984-02-01), Harrington
patent: 4723072 (1988-02-01), Naruse

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