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:
Feb. 26, 2013
Filed:
Oct. 31, 2008
Adam Lister, Hampshire, GB;
Lawrence Commander, Reading, GB;
Adam Lister, Hampshire, GB;
Lawrence Commander, Reading, GB;
De La Rue International Limited, Hampshire, GB;
Abstract
The present invention relates to improvements in security devices that can be used in varying shapes and sizes for various authenticating or security applications, and in particular to an optically variable security device utilizing colorshift materials. The security device () comprises a first and a second layer (, lib) of a colorshifting material at least partially overlying each other and each having different colorshifting properties. At least partially applied over surface of one of the colorshifting layers is a light control layer () having a surface structure which modifies the angle of reflected light, such that light reflected by the security device is seen at a different viewing angle.