Method of manufacturing spectacle lenses
CA 2332237 A1 · Owner: Essilor International (Compagnie Generale D'Optique) · Inventors: Menezes, Edgar; Kokonaski, William; Merrit, James S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides methods for producing a full prescriptive range of spectacle lenses while minimizing the number of the optical preforms molds, or both required to produce the lenses. The method of the invention uses the distribution of the lenses distance power between an added layer or layers and an optical preform to reduce the number of preforms molds, or both , required in the lens production.
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 February 15, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 15, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 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.