Method and apparatus for storing and reading authenticating info

Details Method and apparatus for storing and reading authenticating info Method and apparatus for storing and reading authenticating info

1976-08-09

1978-12-12

Corbin, John K.

Optics: measuring and testing

Document pattern analysis or verification

250550, 350162R, G02B 2738

Patent

active

041293827

ABSTRACT:
A method and apparatus are provided for storing and reading authenticating information which is recorded on a carrier comprising at least one diffraction screen for modifying the path of a beam from an optical reading apparatus consisting of a light-source and a light-receiver. A method is provided for producing an information carrier having at least one diffraction screen.

REFERENCES:
patent: 3412493 (1968-11-01), French
patent: 3633037 (1972-01-01), Langenbeck
patent: 3689772 (1972-09-01), George et al.
patent: 4023010 (1977-05-01), Horst et al.
Samson, J. A. R. Efficiency of Aluminized Gratings in the Spectral Range 555 to 1600A.degree., Jr. of Optical Soc. of America, vol. 52, 5-1962.

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