Authentication of articles
AssigneeInnovia Films Limited
InventorsStephen Langstaff, Robert Stewart
Life of this patent
Estimating the term…
Abstract
The present invention provides a method of authenticating the provenance of an article marked with a transparent polymer film comprising measuring the thickness of the film or of a layer within in the film by white light interferometry and/or by birefringence.
Claims25
A method of authenticating the provenance of an article marked with a transparent polymer film, comprising:
- measuring the thickness of the film or of a layer within in the film by white light interferometry and/or by birefringence.
A method of identifying an authentic article including a polymer film on the basis of the film meeting a specified pre-defined criterion of thickness and/or birefringence, comprising:
- measuring a thickness of the film or of a layer within in the film by white light interferometry and/or by birefringence.
A process for authenticating the provenance of an article,. comprising marking the article with a transparent polymer film and then measuring the thickness of the film or of a layer therein by means of white light interferometry or birefringence.
Dependencies are inferred from the claim text.