Back to results
US 5,169,707 AGranted
Retroreflective security laminates with dual level verification
AssigneeMinnesota Mining and Manufacturing Company
InventorsLynn E. Faykish, Douglas K. Fossum, Wallace K. Bingham
Life of this patent
Estimating the term…
Abstract
A retroreflective security laminate, designed to be applied to the surface of a document over information thereon, providing dual levels of verification. The laminates have primary legends which are viewable under both ordinary diffuse lighting conditions and retroreflective viewing conditions and may also have retro-legends which are viewable only under retroreflective viewing conditions.
Claims18
A substantially transparent laminate comprising:
- a) a base sheet comprising microspheres arranged in substantially a monolayer with partially-light-transmissive reflectors disposed behind the rear surfaces thereof, said microspheres being at least partially embedded in a transparent binder layer;
- b) a cover sheet bonded to the front side of said base sheet;
- and
- c) a pattern of image-forming material disposed on the same side of said microspheres as said cover sheet;
- wherein said pattern is visible as a primary legend under ordinary diffuse light viewing conditions and under retroreflective light viewing conditions, said legend being a substantially directionally variable image under ordinary diffuse light viewing conditions.
2 more elements
Dependencies are inferred from the claim text.