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:
Nov. 11, 2014
Filed:
Nov. 12, 2010
Xabier Quintana Arregui, Madrid, ES;
Jose Manuel Oton Sanchez, Madrid, ES;
Morten Andreas Geday, Madrid, ES;
Carlos Carrasco Vela, Madrid, ES;
Xabier Quintana Arregui, Madrid, ES;
Jose Manuel Oton Sanchez, Madrid, ES;
Morten Andreas Geday, Madrid, ES;
Carlos Carrasco Vela, Madrid, ES;
Universidad Politecnica de Madrid, Madrid, ES;
Abstract
A novel document security and authentication system is based on a transparent element on which more than one image appears depending on the manner in which the element is viewed. The system is based on cells or sheets of liquid crystal doped with one or more dichroic dyes. The images obtained with the aid of a polarizer can be printed onto a very thin (μm or 10 tens of a μm) sheet of polymer material; the images may also be in greyscale or in color. There is no need to apply electrical signals during the production or use thereof.