Verification device

Details Verification device Verification device

1981-05-11

1983-09-06

Mancene, Gene

Card, picture, or sign exhibiting

Changing exhibitor

Variable reading stationary exhibitor

40616, 40615, 40626, 350127, 430 7, G03B 2502, G03B 2160, G09F 1900

Patent

active

044021500

ABSTRACT:
A verification device has a transparent sheet including parallel rows of lenticules and rows of colored lines in registration therewith. Verification is accomplished by observing optical effects presented by patterns of irregularly positioned rows of lenticules and corresponding colored lines viewed against a surrounding background area of regularly positioned rows of lenticules and corresponding colored lines.

REFERENCES:
patent: 1475430 (1923-11-01), Curwen
patent: 2262492 (1941-11-01), Farrell
patent: 3284208 (1966-11-01), Land
patent: 3312006 (1967-04-01), Rowland
patent: 3318220 (1967-05-01), Battaglia et al.
patent: 3357773 (1967-12-01), Rowland
patent: 3686781 (1972-08-01), Calhoun, Jr.
patent: 3734737 (1973-05-01), Sharp
patent: 3884554 (1975-05-01), Lemelson
patent: 3990895 (1976-11-01), Land
patent: 4076384 (1978-02-01), Deml et al.
J. A. Dobrowolski et al., "Optical Interference Coatings for Inhibiting of Counterfeiting", in Optica Acta, 1973, vol. 20, No. 12, pp. 925-937.
E. H. Land, "An Introduction to Polavision", in Photographic Science and Engineering, vol. 21, No. 5, Sep./Oct. 1977, pp. 225-236.

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