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:
Sep. 11, 2012
Filed:
Dec. 11, 2009
Romain Fayolle, Charenton-le Pont, FR;
Romain Fayolle, Charenton-le Pont, FR;
Essilor International (Compagnie Generale d'Optique), Charenton le Pont, FR;
Abstract
A curved multi-layer structure () is formed from individual films () that are initially flat. The films are firmly bonded to each other along respective facing surfaces. A heat treatment is applied to one or both of the films () of the structure so as to cause respective contractions or elongations that are different for the two films at standard use temperatures. A difference between said contractions or elongations causes the curvature of the multi-layer structure. The structure thus has a permanent curved shape, without contact between compression-forming instruments and a useful part of the multi-layer structure being necessary. The multi-layer structure can then be applied onto a curved substrate without causing any tears or ripples.