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:
Dec. 30, 2025
Filed:
Dec. 16, 2021
Bank of Canada, Ottawa, CA;
The Governing Council of the University of Toronto, Toronto, CA;
Charles Douglas Macpherson, Santa Barbara, CA (US);
Badr Omrane, Ottawa, CA;
Sean Magnus Malmberg, Ottawa, CA;
Peter Herman, Toronto, CA;
Stephen Paulchi Ho, Richmond Hill, CA;
Ehsan Alimohammadian, Toronto, CA;
Bank of Canada, Ottawa, CA;
The Governing Council of the University of Toronto, Toronto, CA;
Abstract
Disclosed are optical devices suitable as security devices for document authentication, which comprise at least one array of patterns such as laser-fabricated patterns, or other structures, optionally formed for example from elongate laser-modified tracks extending within a document substrate. The patterns are combined with at least one array of microlenses to cause certain optical effects. Also disclosed are the use of such devices for document authentication, and methods for their production.