System, apparatus, and method for correcting vision using an electro-active lens
CA 2652069 C · Owner: Duston, Dwight P. · Inventors: Duston, Dwight P.; Blum, Ronald D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electro-active spectacle lens (700) is disclosed. The disclosed lens includes a first lens optic. The disclosed lens also includes a first electro- active zone (720) positioned in a cooperative relationship with the first lens optic. In certain embodiments the electro-active lens includes a range finder positioned in a cooperative relationship with the electro-active lens.
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 June 30, 2000 and granted March 26, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 30, 2022.
- 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.