Flexible sheet or web materials

Details Flexible sheet or web materials Flexible sheet or web materials

1988-05-06

1990-01-30

Watts, Douglas D.

Printed matter

Having revealable concealed information, fraud preventer or...

Utilizing electromagnetic radiation

283 70, 350407, B42D 1500, B42F 500, G02B 2728

Patent

active

048969010

ABSTRACT:
A document security article is disclosed in which a light polarizing element is contained within a flexible sheet element. A region of the light polarizing element is exposed at a window at both faces of the sheet element and optionally at a further window at one face of the sheet element. Folding the article to align the windows produces cross polarization between the exposed regions of the light polarizing element.

REFERENCES:
patent: 2388352 (1945-11-01), Vent
patent: 3313052 (1967-04-01), Malster
patent: 3391479 (1968-07-01), Buzzell et al.
patent: 3994565 (1976-11-01), Van Doorn et al.
patent: 4123141 (1978-10-01), Schuler
patent: 4186943 (1980-02-01), Lee
patent: 4285577 (1981-08-01), Schuler
patent: 4379634 (1983-04-01), Rosenthal

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