Retroviewer

Details Retroviewer Retroviewer

1979-10-29

1981-03-24

Corbin, John K.

350299, G02B 2714

Patent

active

042576776

ABSTRACT:
A retroviewer for viewing documents, labels or other articles having a retro-reflective legend bearing layer of microscopic beads overlying a portion or all of the information on the article. The layer appears transparent under normal diffused lighting conditions but when illuminated by substantially collimated light, the information is obscured leaving the legend prominently displayed. Altered or counterfeit articles are thus easily detectable. The retroviewer is designed to accommodate articles of various shapes and sizes and to permit the observer to view an article from a comfortably seated position, with adjustments possible for observers of various heights.

REFERENCES:
patent: 3767291 (1973-10-01), Johnson
patent: 3767305 (1973-10-01), Craven
patent: 3832038 (1974-08-01), Johnson
patent: 3944336 (1976-03-01), Carr
patent: 4131337 (1978-12-01), Moraw et al.

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