Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1990-11-15
1993-10-19
Loney, Donald J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
428143, 428148, 428161, 428163, 428164, 428167, 428168, 428172, 428195, 428201, 428206, 428209, 428215, 428344, 428354, 428906, 359291, 359321, 359536, 359542, 359641, B32B 300
Patent
active
052543900
ABSTRACT:
An article comprising a transparent plano-convex base sheet having first and second broad faces, the second face being substantially planar and the first face having an array of substantially hemi-spheroidal microlenses thereon, the shape of the microlenses and thickness of the base sheet being such that collimated light substantially orthogonally incident to the array is focused approximately at the second face. The article optionally further comprising a specularly reflective layer on the second face which renders the base sheet retroreflective. An optional layer of adhesive over the reflective layer permits the article to be adhered to a document as a tamper-indicating, authenticating, and protective overlay. Special images can be formed within the article to enhance the security provided thereby. Also, a method for forming such articles.
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Griswold Gary L.
Jordan Robert H.
Kirn Walter N.
Loney Donald J.
Minnesota Mining and Manufacturing Company
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