Method for determination of an ophtalmic lens
CA 2633279 C · Owner: Essilor International · Inventors: Bourdoncle, Bernard; Marin, Gildas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The subject of the invention is a method for determination by optimization of an ophthalmic lens for a wearer for , whom a power addition has been prescribed. The method proposes using as a target for the optimization of the lens under wearing , conditions, a difference of the mean orientation of the axes of resulting astigmatism to the vertical of less than 2.5° in a first control zone delimited by an ellipse centred on the progression meridian at half height between the fitting cross and the near vision reference point, said ellipse having a major axis greater than 35° and a minor axis comprised between 3.8° and 4.5°. The invention allows improvement in the performances of the …
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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 July 4, 2006 and granted October 27, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 4, 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.