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:
Aug. 09, 2016
Filed:
Apr. 13, 2010
Applicants:
Robert Whiteman, Berkshire, GB;
Christopher John Eastell, Swindon, GB;
Inventors:
Robert Whiteman, Berkshire, GB;
Christopher John Eastell, Swindon, GB;
Assignee:
DE LA RUE INTERNATIONAL LIMITED, Hampshire, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B42D 25/364 (2014.01); B42D 25/324 (2014.01); G02B 1/00 (2006.01); B42D 25/29 (2014.01);
U.S. Cl.
CPC ...
G02B 1/005 (2013.01); B42D 25/29 (2014.10); B42D 25/324 (2014.10); B42D 25/364 (2014.10); B42D 2033/12 (2013.01); B42D 2033/24 (2013.01); B42D 2033/26 (2013.01); B42D 2035/20 (2013.01); B42D 2035/34 (2013.01);
Abstract
A security device is disclosed having a region of piezochromic material and an integrated relief structure. The security device is arranged such that when a stress is generated in the piezochromic material and relief structure, an optical effect is generated in the piezochromic material.