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:
Mar. 08, 2016
Filed:
Mar. 13, 2014
Applicant:
Opsec Security Group, Inc., Denver, CO (US);
Inventors:
Paul Dunn, Leicestershire, GB;
Robert Edward Renton, Lincolnshire, GB;
Andrew Neil Cammidge, Norwich, GB;
Assignees:
OPSEC SECURITY GROUP, INC., Denver, CO (US);
UNIVERSITY OF EAST ANGLIA, , GB;
Primary Examiner:
Int. Cl.
CPC ...
C09K 19/58 (2006.01); B05D 3/06 (2006.01); C09K 19/04 (2006.01); C09K 19/32 (2006.01);
U.S. Cl.
CPC ...
C09K 19/586 (2013.01); B05D 3/067 (2013.01); C09K 2019/0448 (2013.01); C09K 2019/323 (2013.01);
Abstract
The invention generally relates to optically variable devices, methods of preparation and applications or uses therefor. In particular, the invention includes trigger molecules employed as a dopant for a liquid crystal material. The liquid crystal material contains helical elements having a natural twist. The dopant is effective to change the natural twist of the helical elements when the dopant is addressed with incident light. Suitable dopants are selected from binaphthalene and derivatives thereof.