Process for the manufacture of spectacle lenses
CA 2599088 C · Owner: Essilor International(Compagnie Generale D'Optique) · Inventors: Gerligand, Pierre; Joseph, Timothy
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for determining a blunt edge contour B (310) of a spectacle lens comprising , the steps of :, a) determining a minimum edge thickness (16) for an uncut lens; b) using the minimum edge thickness (16) to determine a thickness requirement; c) calculating a thickness function t of the uncut lens; d) calculating a cribbed diameter of the uncut lens; e) using the thickness function and cribbed diameter to determine a first set of points , (220 ab, 220 cd) that does not satisfy the thickness requirement and a second set of , points (220 bc, 220 ad that satisfies the thickness requirement; f) determining a third set of points (230 ab 230 cd) that describe a diameter , contained within …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 14, 2006 and granted November 17, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 14, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.