Soft bifocal contact lens
CA 2076686 A1 · Owner: Morstad, David P. · Inventors: Morstad, David P.; Morstad, David P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
of the Invention, A translational soft multi-focal contact lens includes a near-vision portion located in the upper approximate one-third of the optical zone of the lens. A thin upper portion is, formed by a base-down prism in the contact lens which is pushed by the upper eyelid to move the lens downwardly in relation to the cornea, with the thickest part of the lens below the upper lid to assist downward movement, as the lower lid moves down. It also translates down in upward gaze and laterally and down, in sidewards and downward gaze.
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 24, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 24, 2014.
- 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.