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. 22, 2017
Filed:
Apr. 21, 2011
Applicants:
Charles Douglas Macpherson, Santa Barbara, CA (US);
Bruce Alfred Hardwick, Wandong, AU;
Inventors:
Charles Douglas MacPherson, Santa Barbara, CA (US);
Bruce Alfred Hardwick, Wandong, AU;
Assignee:
Nanotech Security Corp., Burnaby, BC, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B42D 15/00 (2006.01); B42D 25/29 (2014.01); B42D 25/425 (2014.01); B42D 25/373 (2014.01); G02B 5/28 (2006.01);
U.S. Cl.
CPC ...
B42D 15/00 (2013.01); B42D 25/29 (2014.10); B42D 25/425 (2014.10); G02B 5/28 (2013.01); G02B 5/286 (2013.01); G02B 5/288 (2013.01); B42D 25/373 (2014.10); B42D 2033/10 (2013.01); B42D 2033/12 (2013.01); B42D 2033/18 (2013.01); B42D 2033/32 (2013.01); B42D 2035/24 (2013.01); B42D 2035/26 (2013.01); B42D 2035/36 (2013.01); G02B 5/287 (2013.01);
Abstract
Security documents often incorporate optically variable devices to prevent or hinder counterfeiters. Disclosed herein are layered optically variable devices such as color-shift foils, and methods for their production and use. Such devices afford new techniques for a user of a security document to check quickly and easily whether the security document is a legitimate document or a counterfeit copy.