Contact lenses
CA 2492541 C · Owner: Alcon Inc. · Inventors: Hall, Jordan William; Ye, Ming; Lindacher, Joseph Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a contact lens having an orientation feature that does not provide a prism optical distortion and can maintain a predetermined orientation of the lens on an eye. A contact lens of the invention comprises an anterior surface and an opposite posterior surface. The anterior surface includes a vertical meridian a horizontal meridian, a , central optical zone a blending zone extending outwardly from the central optical zone, a peripheral zone surrounding the blending zone and an edge , zone circumscribing and tangent to the peripheral zone. The presence of the blending zone ensures that the peripheral zone the blending zone and the , central optical zone are …
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 August 5, 2003 and granted October 30, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 5, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 5, 2025.
- 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.