The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 01, 2021
Filed:
Oct. 08, 2015
Universidad Politecnica DE Madrid, Madrid, ES;
Alise Devices, S.l., Villanueva de la Cañada, ES;
Morten Andreas Geday, Madrid, ES;
Patxi Xabier Quintana Arregui, Madrid, ES;
Jose Manuel Otón Sánchez, Madrid, ES;
Beatriz Cerrolaza Martínez, Madrid, ES;
Carlos Carrasco Vela, Madrid, ES;
UNIVERSIDAD POLITECNICA DE MADRID, Madrid, ES;
ALISE DEVICES, S.L., Villanueva de la Cañada, ES;
Abstract
The present invention is related to a manufacturing method of an optical feature for documental security which includes multiple latent images whose visualization depend on the mode the feature is observed. The method comprises the steps of defining the different regions present on the inner surface of a first confinement structure; inducing different alignment directions on the defined regions; defining a second alignment structure wherein the second structure is a polarizer with multiple patterns; placing the liquid crystal between the first and the second structures, and polymerizing the liquid crystal, forming a sheet. The images are visible by means of a polarized light source or a polarizing sheet.