Bifocal intraocular lens with spherical aberration correction
CA 2107797 C · Owner: Carncross, Thomas · Inventors: Van Noy, Stephen James; Carncross, Thomas; Patel, Anilbhai S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Intraocular lenses with three zones for the provision of bifocal vision are described. Methods for the lenses' use are also described. The three zones comprise a central zone (1) for the provision of distance vision, a second zone (2) surrounding the central zone for provision of near vision and a third zone (3) surrounding the , second zone for provision of distance vision. The radius of curvature of the third zone differs from that of the central zone such that images formed by the central and third zones are coincidental in aqueous. Such an arrangement corrects for spherical aberration.
Read the whole patent
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 March 16, 1992 and granted October 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 16, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 2014.
- 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.