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:
Jan. 08, 2019
Filed:
Sep. 09, 2011
Applicants:
Stephen Langstaff, Wigton, GB;
Robert Stewart, Wigton, GB;
Inventors:
Stephen Langstaff, Wigton, GB;
Robert Stewart, Wigton, GB;
Assignee:
INNOVIA FILMS LIMITED, Wigton, Cumbria, GB;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G01B 11/06 (2006.01); G07D 7/12 (2016.01); G07D 7/164 (2016.01);
U.S. Cl.
CPC ...
G01B 11/06 (2013.01); G07D 7/12 (2013.01); G07D 7/164 (2013.01);
Abstract
The present invention provides a method of authenticating the provenance of an article marked with a removable transparent polymer film comprising measuring the thickness of the removable transparent film while still located on the article or of a layer within the film while still located on the article by white light interferometry. Alternatively, or in addition, the method comprises measuring the birefringence of the removable transparent polymer film while still located on the article or of a layer within the film while still located on the article.