Documents coded by means of machine-readable optical markings

Details Documents coded by means of machine-readable optical markings Documents coded by means of machine-readable optical markings

1976-11-16

1979-03-13

Cook, Daryl W.

Registers

Records

235457, 350 361, G06K 1906, G06K 710, G02B 532

Patent

active

041438108

ABSTRACT:
There is described a method of producing a document coded with machine-readable information, said document having an information carrier with a multiplicity of storage positions, wherein selected storage positions are occupied by respective machine-readable optical markings, which markings cause a predetermined modification of incident light; the geometrical position of the markings on the information carrier represents coded information. In the method disclosed, such an optical marking is introduced into each storage position, and subsequently, selected optical markings are cancelled or altered. Also described are documents coded by means of the disclosed method, as well as a device for cancelling or altering the optical markings.

REFERENCES:
patent: 2735617 (1956-02-01), Knutsen
patent: 3814904 (1974-06-01), Russell et al.
patent: 3873813 (1975-03-01), Lahr et al.
patent: 3919447 (1975-11-01), Kilmer, Jr. et al.
patent: 4011435 (1977-03-01), Phelps et al.
patent: 4020278 (1977-04-01), Carre et al.

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