Ophthalmic lens
CA 2622093 C · Owner: Chauveau, Jean-Pierre · Inventors: Le Saux, Gilles; Decreton, Bruno; Chauveau, Jean-Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Progressive multifocal ophthalmic lens having a power addition prescription and presenting a complex surface having a fitting cross and a principal meridian of progression. The lens has, when being worn a normalized reduced , root mean square deviation of less than 0.025 microns per dioptre over a zone that includes the far vision control point and covering a sector whose apex lies 4~ below the fitting cross with an angular aperture of between 150~ and 160~; and a progression length of 25~ or less the progression length being , defined as the angle of lowered of the view direction from the fitting cross down to the point on the meridian for which the wearer's optical power reaches …
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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 28, 2014. 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.