Method of manufacturing an electro-active lens
CA 2496265 A1 · Owner: Duston, Dwight P. · Inventors: Blum, Ronald D.; Kokonaski, William; Duston, Dwight P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of manufacturing an electro-active lens is disclosed. The lens is manufactured by providing a lens blank (10) having a front and back surface a , thickness, and an index of refraction. An electro-active element is placed on one of the front or back surfaces of the lens blank (20). A covering surface is then formed over the surface of the lens blank containing the electroactive element (30). In some embodiments the electro-active lens may then be , surfaced to provide a desired fixed optical power (1960) and edged to fit within a spectacles frame (1950).
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 20, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 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.