Balanced progressive lens
CA 2467786 C · Owner: Fisher, Scott Warren · Inventors: Nolan, Angela Moira; Varnas, Saulius Raymond; Fisher, Scott Warren
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A progressive ophthalmic lens element including a lens surface havingan upper viewing zone having a surface power to achieve a refracting power corresponding to distance vision,a lower viewing zone having a different surface power than the upper viewing zone to achieve a refracting power corresponding to near vision; andan intermediate zone extending across the lens element having a surface power varying from that of the upper viewing zone to that of the lower viewing zone one or more of the upper intermediate , and lower viewing zones being designed optically to reduce or minimise a selected measure of blur for the corresponding range of object distances; andat least a portion of …
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 December 4, 2002 and granted May 15, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 4, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 4, 2024.
- 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.